Практика Shadowing: Why AI Tokens are so Expensive - Computerphile - Изучайте разговорный английский по видео

I thought, given how much it's been in the news about costs of AI and, you know, agentic coding and how much you pay per month and all this stuff,

I thought we could look at what is a token and why is it so unbelievably expensive?

This is happening everywhere.

So, for example, Amplopic have more caps on.

For their premium users, you might hit a cap where you have to go

and wait for a while sooner than you used to.

for the famous recent one was the GitHub copilot change,

which changed from a request-based monthly cost to a AI token credit monthly cost,

which has substantially reduced the amount you can do per month.

And we can talk about why that is and why essentially it was inevitable, given how expensive it is to run those agentic coding models.

Well, you could call this video, What is a Token?

But we're going to answer that straight away right the token is either a word

or a piece of a word that is it it's not an interesting question right

so if I write the cat sat on the mat you might intuitively

if you're a person split this up per word

but we don't incorporate spaces kind of in our head we

just use them to find the words large language models and modern AI

will use the spaces as well full stops will be tokens curly brackets will be tokens

if you have chinese characters they might be one

or two tokens right because they're more complicated

so you might have you know this might be a token

and then this might be a token with the space included

and you know you might have

that i'm just making this up right you know something like

that the exact split will depend on who's running the model

and the tokenizer they're using they're based around this idea of frequency

so for example because the is so common on its own it would make sense for it to be a token.

A modern language model will have access to let's say a hundred thousand of these tokens

which will include standard British things but also other languages

and code symbols and special Unicode characters and things like this right

so most of the tokens will be in a small subset of a few thousand

that get used most of the time but there'll be many more

that it could produce if the if the need arose

but they haven't been decided they

if they emerged no they've been decided they've been decided the tokenizer is essentially a string parser

that goes in front and at the end of a large language model what happens

when these go through a network is these get turned into a numerical representation called an embedding

which means that this one will have some high dimensional vector of numbers

that represents what the word the means right not a lot

and cat will be different and app will be different and

so on that part is learned so

that part will be bespoke for whichever large language models being used

but they probably use whichever token either they've always used

so we did a video a

while back with lewis where we did i don't know mike

in a nike on a hike mike on a bike yeah

a bike on a mic mic at a strike yeah yeah different tokens

but they're different tokens

but they would be in some senses in similar similar words

will be in similar space probably right it will come out of a training process it makes sense

that they would be um the in some sense the tokenization

part is is almost a sort of system development issue one thing

that is interesting is you would think well why would you why would you have a hundred thousand tokens

when you're writing let's say javascript

because javascript only uses a subset of the you know lots of them aren't valid tokens after a an

if statement there's only a certain number of tokens you can

you can predict otherwise it doesn't make sense that's true

but part of the power of these models is their huge size

and their massive pre-training and

so it actually isn't particularly cost-effective necessarily to have a model

that's only trained on code what you tend to do is refine a model that's trained on everything else

so you will just have all the tokens included

that could do javascript or they could write english poems

and then later you will refine that model into a specific domain by giving it extra examples.

That presumably helps with people prompting it as well and asking it to do things for them.

Yes and actually you can ask these models to do things in base64

and they will pretty much do it right because to it it's just input tokens.

This isn't in some sense this isn't the interesting part.

The interesting part is

is when you talk to a model how much does it cost

because that's what we all want to know

and the answer is right the answer is we're not sure but actually we can come up with some guesses.

these models work in something called an auto-aggressive way and what

that means is

that they put they take in this input they look at

the whole input as a big list they make a lot of decisions

and then they output a single next token so

if I gave it the input the cat sat on the

right these tokens here it would with high likelihood return as its next prediction this token here

and that's true of code and all other kinds of things

if I write half an if statement and I ask it to complete it for me, it will use the rest of the context and its pre-training to produce likely output tokens.

The issue is, and the thing that perhaps a lot of people haven't quite, certainly, you know, in the media hasn't grasped and in sort of standard audience hasn't grasped,

is how unbelievably inefficient that is, right?

So when you ask me a question and I answer it, what I don't do is quickly reread the whole transcript of this previous conversation in order to answer it.

I suppose I might if I've completely forgotten what I'm saying.

But in general, I can hold some things in my head and then I can answer the question.

Large language models don't work that way.

Everything goes in every single time.

So when you want to put the next statement in and the next statement you're putting in this, then you're putting in this, then you're putting in this, and it gets bigger and bigger and bigger.

And that comes at a cost.

It comes at a particular cost for coding agents where the size of its input goes up hugely

and that's I think where it gets quite interesting and the cost becomes a little bit confusing.

Let's imagine we're just on a website talking to a large language model.

In some sense it's not a very difficult question, I ask it 500 tokens worth of question,

it produces some thousand tokens worth of thought process which is the bit it writes before it answers, but may or may not be seen by the user.

And then maybe it outputs a 500 token response.

So the actual whole token cost and input tokens is my input.

I mean, let's look at a concrete example.

You might have a system prompt, which let's say is 1,000 tokens.

100

Conservatively, they'd be much bigger than this.

101

And that's things like you are an AI agent.

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Yeah, don't tell them what the system prompt is.

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Don't answer rude questions, this kind of stuff.

104

And the current time and the operating system are on, and maybe some actual user-specific stuff.

105

You then have the user query, which let's say is 100 tokens quite a short question.

106

Then you have the thought, which is the output tokens, but it produced in response to these two things added together.

107

So the actual input to the model was 1100 tokens.

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And then for the first thought word, the output then goes back in.

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So now it's system plus user query plus the first word of the thought.

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So it's 1101 tokens, and then 1102.

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And this loops over and over again.

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Oh, so like you said, when it's predicting the word mat on the cat sat on the, after mat, you have to have the cat sat on the mat again to work out what comes next.

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Yes.

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Yes.

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You don't just say you said mat, what's the next word?

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You have to say, don't forget all this other stuff that came in first.

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Right.

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Now, we'll talk in a minute about caching because that's a big thing for speed ups and efficiency.

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But that's basically what happens.

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So if this thought process is 10,000 tokens, I asked a complicated but brief question right

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and then its response is let's say 1 000 tokens there's a lot going on

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because the actual output was what was 10 000

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and another thousands 11 000 tokens right

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and the input was symbolically 1 100 tokens

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but that's not how it works it works on a loop

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and so actually it ran a forward pass through a gpu 11 000 times right

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and each time the context in the gpu got slightly bigger right with with the previous thing

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which is why it costs so much electricity to run these models right

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because you don't just say here's your output sentence you say

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here's the first word of your output sentence let's go again now it's not quite as inefficient as this

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because I'm being a bit unfair right

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because actually what they do is something called kv caching

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which I think probably will leave to another video

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but ultimately what happens is if you're adding the word map to this sentence

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and then you add another word let's say the word to right new sentence

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so this is a new token

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when you actually put this through the network to predict the

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next word we don't have to calculate the relationship between cat

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and at and cat and on because we already did

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that the previous go so we cache those values

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so a lot of the intermediate representations in the network are stored as you go

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so that when you add another one you don't have to completely do everything from scratch

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which makes a huge difference for very very big context windows

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for this sentence it makes almost no difference at all but

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if you've got a million documents you're putting in you're trying to find the best bit of each one

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and your context window is full up

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and it's all gonna this will this will help of course

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there's an implementation question of how long do you keep this cache live for

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if i ask a long question of a large language model it caches all of these values

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and then i go off for a coffee

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and come back later it's got to have dropped

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that from the gpu because it's got other people to talk to right

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and so in actual fact it will then have to put all those back in again and That's called pre-filling.

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It's almost a system design issue, right?

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The more aggressively you can cache some of these things the

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better your performance will be To the point where it becomes it's not helpful, right?

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Or the user is too slow

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Asking questions and you've had to get rid of the cache

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because they have a very short time to life time to live, right?

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So you obviously cats sit on the mat all the time.

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Yeah, not a huge amount of

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tokens in use in that example for the kind of

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And you're imagining kind of a chat bot

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or something doesn't seem to be using a lot of tokens Where does this you know, what's the deal with all this?

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Yeah, everyone's very cross about the cost, but they're mostly cross about the cost of coding agents, not them going online and chatting to a chatbot with simple questions like which what did the cat sit on?

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And the issue is that this scales up very, very quickly.

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And we're going to talk about that with a very simple example.

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But the thing to remember is whether you're caching it or not caching it, every time you go forward through a network, everything is in there.

169

And if you then wait a few minutes and you go in again, right, and you do or don't get cash hits, this gets longer.

170

Suppose I ask a follow up question to this.

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Right.

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Well, in order to answer that, it has to be able to read the original query, the thoughts and the response, which is some 11,100 tokens.

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And my new query, which is another 200 tokens.

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So that input is bigger than the one before.

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The input to the one before was 1,100 tokens and a bunch of output.

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Now it's nearly 11,000 tokens.

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And then I ask another question and now it's 20,000 tokens.

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And I ask another question and it's 30,000 tokens.

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Or it goes and reads a file which itself is 50,000 tokens.

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And now every time I ask a question, it has to have this file in the context as well, which adds 50,000 to every single iteration.

181

That's when the price gets very, very big, very, very quickly.

182

And agents, coding agents, are particularly good at scaling this cost up very, very quickly.

183

And so this is what's been

184

so interesting in the last few months where the cost of these has kind of become more known.

185

And some companies are switching to what I might sort of call a slightly more realistic costing model.

186

But let's see.

187

Let's think about the difference between a chatbot and a coding agent.

188

A coding agent has more autonomy.

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So what happens is it has access.

190

I can talk to it, but it also has access to my files and it can make what we call tool calls.

191

a tool call is just instead of outputting directly to me it outputs to the system

192

and says I would like to do this thing I would

193

like to read this file I would like to read the

194

specific lines of this file I would like to delete this file the system then goes off

195

and does that thing maybe it asks for permission first maybe it doesn't

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and then and then the model continues to output maybe to me directly

197

or maybe a code change and so the reason we call it an agent is

198

because it's going off

199

and kind of doing this thing I'm not responsible for here are five files

200

that I've pasted in the chat please can you give me

201

this bug fix it is there is a bug can you go off

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and find it in these five files and

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and action the response right that's the different thing

204

which as a programmer would be a lot easier right you

205

don't want to have to paste everything in the context window to begin with

206

so the problem the problem is that it's the same sense of scaling up as we had before.

207

Most of the cost of these models are measured in input tokens and output tokens.

208

So most of the modern providers will charge you somewhere around two to three dollars for a million input tokens

209

and something like $15 for a million output tokens.

210

They are what have you sent into the model and what streaming text did it send out.

211

So if I put in the cat sat in the and it sends out Matt, I've only got I've only been charged for one output token which is kind of cheap unfortunately

212

coding models don't only write the word mat so let's imagine

213

that I fire up a coding agent so there's loads of them right

214

but I I um I was recently I will show you in a moment

215

but I was having a play around with github copilot on the command line and the I asked it a question

216

hang on a minute I've gone into you know word and I've produced a bunch of boxes I basically

217

I don't know if you remember back to our Dijkstra video where we had little cards.

218

I thought that might be quite a nice way to visualize this.

219

So I've got myself a system prompt here of some unspecified number of tokens.

220

The system prompt is, you know, the instructions that the manufacturer's given it, right?

221

You are a GitHub copilot coding agent and you must solve Mike's problems because he doesn't want to do it for himself.

222

So we put in the system prompt always.

223

And then I ask it a question.

224

So my question might be, or a programmer's question might be, I've got a bug in my authentication code when someone types a certain thing it crashes

225

please go and find this bug and fix it for me right so the system prompt is let's say

226

4,000 tokens I never see them but they are there

227

and my my my query is let's say a nice modest 200 tokens

228

so the input cost to the model in terms of input tokens is 4,200 tokens right

229

which I'm going to write let's go with another color right

230

so 4200 tokens now there's a very good chance I'm going to do my maths wrong

231

but we'll keep going now what does what's the first thing

232

that a coding agent will do is it will have a

233

good think to itself right it will produce some thought text

234

so it outputs it outputs its initial thoughts the user has

235

asked this I've reminded myself I'm a coding agent maybe I should do this

236

or perhaps I could do this and it churns away for a

237

while and maybe produces let's say 2,000 output tokens

238

so they cost my output but I've only paid for 4,200 input tokens

239

so so far so good right this has not cost me a huge amount of money yet

240

brace yourself right now in response to thought number one it decides it's going to make a tool call

241

if it's going to actually answer the question it needs to look at the file that's the problem

242

and so what it does is it makes a tool call

243

and it's going to say I'd like to read file one

244

so let's say index.html or login.php or something.javascript right and

245

that is a very short output

246

so that's maybe 100 tokens it's just a small bit of structured json between some special characters

247

that tells the system read that file for me it then the system does

248

that and dumps the file contents into the chat right like this you won't see

249

that file contents because it will be hidden from the user

250

but it's in there and that file is is not small so that file is maybe 5,000 tokens

251

right so now we have a problem

252

because now the large language model has to read this file

253

and decide where the bug is and what it has to do

254

so this is now an input of four nine eleven 11,300 tokens, right?

255

11,300 tokens.

256

Not too bad, right?

257

But that's in addition to the 4,200 I've already paid for, right?

258

Which was just its initial thinking and a tool call.

259

Okay, let's keep going.

260

So it thinks for a while longer, right?

261

Like this.

262

And that's going to be another 2,000 tokens.

263

Now, one of the interesting things about large language models is that the thoughts can be very, very short, or they can be incredibly long and there are different models

264

that do different things it's difficult to know going in they might get stuck in a loop

265

and think for ages and achieve nothing

266

or they might be very very succinct right one of the lovely unknowns

267

so in response to tool called thought number two it's going

268

to make another file read of something else dot php

269

or database dot pi

270

or whatever i'm literally making up file names um why they're all programmed in different languages is someone else's

271

because i wrote it it the system will return the file content

272

So the tool call was maybe another 100 tokens and the file contents is perhaps another 4,000 tokens.

273

Now this goes back into the model

274

and it has to make a decision on what to do in terms of fixing the code.

275

So this is now 11,300 plus another 2,000.

276

So 13,300, 17,400 tokens.

277

right 17,400 input tokens I've not even got my answer yet right um okay it's getting a bit grim

278

but all right let's keep going

279

so now it thinks to itself again well why wouldn't it

280

right I'm running out of page I'm gonna go like

281

that look at that um so this thought is another 2,000 tokens

282

it's just a just a guess it doesn't really matter for

283

this example it finally comes up with a solution it's read

284

the files it knows what the code fix is it knows what my query was

285

and it's done it in it's thought through the logic of it in the thinkings uh thinkings right

286

and so it finally makes a tool call to actually code patch the code

287

which is done kind of using a diff it says take

288

out these lines of code add these lines of code right

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and maybe that's 1500 tokens right maybe I'm being a bit harsh

290

but let's say it's a big big code change my code is not good let's just recap

291

so the initial query

292

that went to the model was these two right like this the next query

293

that goes to the model includes that information

294

because it has to that's the original query you can't just read the file

295

and then go well now i've forgotten what i was meant to do with it so so

296

that is this bit it takes this it does some thinking it asks for a tool call those output tokens

297

and then it gets 5 000 tokens back

298

so these add up to 11 300 in addition to the 4 200 you already paid for.

299

Then it thinks again.

300

It makes another tool call and it outputs some file contents.

301

And the next query is 17,400, right?

302

In response to which it finally starts coming up with some answers.

303

It says, okay, here's Fort 3.

304

That's 2,000 tokens.

305

Here's the code patch, 1,500 tokens.

306

And that returns a result that's a success of, let's say, 50 tokens that goes,

307

yet we've successfully successfully done that right and that means that the final

308

the final prompt that goes through this model is this one

309

which is 17 400 plus another 2000

310

so 19 400 20 900 plus another 50 is 20 950 tokens right input

311

and some thousands of output tokens in the various thoughts, tool calls.

312

And of course, what it also then does is produce a final response that says, I've done a really good job.

313

That's also, why not another 500 tokens?

314

I've run out of paper.

315

There we are.

316

So we asked it to do a bug fix.

317

It read two files.

318

It thought to itself a few times in between these steps, and then it made a patch, right?

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And it fixed my code, let's say.

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And in doing

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so, it's cost me 20,000 plus nearly 20,000 is 40,000 plus

322

another 10 plus another five is somewhere around 55 to 60,000 tokens and a few thousand tokens of output as well.

323

And this is a very, very simple request where it's only read two files and just answered the question, right?

324

Now, suppose this doesn't work.

325

I say, now you broke it again.

326

And I put another user query down here this gets shipped in

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and this is going to start getting big very very quickly

328

so let's look at a real example of a fun bit of code

329

that I wrote using github copilot to show how big this

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can get you know what I've always wanted to code

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and could never be bothered was was was a classic windows 3.11 starfield screensaver

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so I went on to copilot

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and I've had it produced this starfield screensaver it's quite fun you know I can go to warp

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and it does little effects for me.

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This is completely coded by Copilot and essentially Sonnet and I haven't done anything.

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I just wanted to see how much it would, how many tokens it would use.

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So I asked about five or six prompts to get to this point.

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The first one was things like, can you add a little bit of color to the stars?

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Can you make them go faster and some slower?

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Things like this.

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At one time it introduced a bug, I had to get to fix his own bug.

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And if I type, so this is the

343

conversation I've been having it's over a few prompts

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and each time it outputs some text

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that it thinks to itself then it outputs some code changes

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and then it outputs its response to me to say what it's done I can see

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that my current token uses for this session

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which was I think six prompts in total one file initially now three files is two million input tokens

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and 47,000 output tokens right it's a lot a lot of tokens it's a lot more than I would do

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if I was just chatting on the web interface there are some companies

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that are measuring whether they're moving to AI by how many

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tokens people are using I mean this is this is ludicrous

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if this is like it's like measuring my quality as a driver by how quickly I wear through my tires

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that is an unsustainable practice there's no doubt it was obvious

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it was unsustainable I think to those of us who understand what a token is before you know

356

if somebody was measuring my use of a broom how many times i used it yeah just swept it backwards

357

and forwards yeah and it turns out you've just created some pulley system

358

but just automatically does it like that episode of the symptoms where he's got

359

that bird doing the s to keep the thing the

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when you have an incentive like

361

that of course people are going to ask really long-winded questions they're going to ask things

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that cause the ai to get stuck in a loop where

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its thought process is much longer they're going to use the more expensive models they're going to use models

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that think for longer periods of time and have to look over more files

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and in a surprise to absolutely no one

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that is completely unsustainable in terms of cost you cannot afford

367

to do it right there will be some companies maybe

368

that will give this a go but for a normal company

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that has normal paid developers right

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so not the big tech companies just normal companies who are producing regular products to be able to spend

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that amount of money on tokens you have to be able to see immediate product return

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so you know we've developed five new features

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that are making us this much more money

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or we have a new product that exists but six months ago didn't

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and it's good right that has not been answered yet yes

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that might happen i remain suspicious

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that the quality of code is good enough for it to do

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that across all companies right um

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and there are there are other issues like the fact

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that you have to kind of know what you're doing in

381

order to you know this is not a good example my my example is not a good example of coding

382

because I haven't read it right so it could be doing all kinds of things

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I certainly wouldn't inflict it on someone else's computer a more

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reasonable way to use these models would be small succinct questions very quick fixes

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or the kind of code completion thing we already see

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so you're in something like codex

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and you say I've written half a for loop can you

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just finish this off for me that's quite a quick you

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only need to read a small amount of context that's quite a

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quick thing the agentic stuff i think will have its place but i think it is worryingly costly and

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we've been seeing a lot of subsidization right github copilot people are only annoyed about

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that because it was being subsidized before

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when you pay a flat fee per month

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and you can have an agent go off for hours

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and hours doing all these millions of tokens of course you're going to think that's absolutely fantastic

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but of course when it gets to the when it gets

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when the rug gets pulled that and they say okay you're paying per token now

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and you realize that that

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that file you just read in is 10 000 tokens being put in over

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and over again suddenly you're kind of thinking well actually could i have avoided

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that could i have done something else that meant it didn't cost quite

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so much money that's what we're going to have to answer over the next year and see how that goes.

403

So I can see, for example,

404

that split 171 is something about exchange of information between internet identities, right?

405

I don't, you know, who knows.

406

The next thing for me to do is to embed every single one of these chunks into the embedded space

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and stick them in a database.

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Контекст и общий фон

Видео посвящено объяснению того, почему токены ИИ стоят так дорого, и разбирает их природу. Диалог ведется в спокойном, аналитическом тоне, с использованием примеров из повседневной жизни (например, GitHub Copilot) и технических терминов. Речь структурирована, с постепенным раскрытием темы: сначала определение токена, затем его роль в языковых моделях. Это отличный материал для практики разговорного английского, так как он сочетает простые объяснения с специализированной лексикой.

5 ключевых фраз для повседневной коммуникации

"What is a token and why is it so unbelievably expensive?" — полезна для обсуждения технологий и их стоимости.
"The token is either a word or a piece of a word" — простое определение, подходящее для объяснений.
"The exact split will depend on who's running the model" — удобна для разговоров о зависимостях в технологиях.
"Similar words will be in similar space" — помогает описать связи между понятиями.
"It makes sense for it to be a token" — используется для обоснования логики решений.

Пошаговое руководство по shadowing для этого видео

Чтобы улучшить произношение английского с помощью этого видео, используйте метод shadowspeak (тень):

Посмотрите видео без звука, чтобы понять интонацию и мимику спикера. Обратите внимание на паузы между словами.
Воспроизведите фрагмент длиной 5-10 секунд, затем повторите его сразу же, копируя ритм и ударения. Сосредоточьтесь на фразах, где есть сложные сочетания sounds (например, "agentic coding").
Запишите себя и сравните с оригиналом. Обратите внимание на то, как вы произносите "token" (токе́н) и "model" (модель) — эти слова часто искажаются.
Повторяйте каждый фрагмент 3-5 раз, пока не почувствуете, что ваше произношение близко к оригиналу. Это поможет развить автоматизм речи.
Проходите по видео целиком, соединяя фрагменты. Это тренирует навык удержания темы и плавного перехода между мыслями.

Учиться английский с YouTube — это эффективный способ, так как вы знакомитесь с живой речью и разными стилями выражения. Регулярная практика shadowing английский позволит быстро улучшить как произношение, так и понимание речи на слух.

Грамматика в этом видео

Конструкции, которые говорящий использует чаще всего, с точными словами из видео:

Конструкция	В видео
Present Perfect Continuous have/has been + -ing — действие началось раньше и продолжается	I've been having · we've been seeing
Present Perfect have/has + причастие прошедшего времени — прошлое действие, важное сейчас	haven't been decided · they've been decided · hasn't grasped
Пассивный залог be + причастие прошедшего времени — важно, что происходит, а не кто это делает	been decided · they've been decided · is learned
Придаточные определительные who / which + предложение — уточнение о человеке или предмете	process which is · thought, which is · response, which is

Что такое техника Shadowing?

Shadowing — это научно обоснованная техника изучения языка, изначально разработанная для подготовки профессиональных переводчиков и популяризированная полиглотом доктором Александром Аргуэльесом. Метод прост, но эффективен: вы слушаете аудио на английском от носителей языка и немедленно повторяете вслух — как тень, следующая за говорящим с задержкой в 1–2 секунды. В отличие от пассивного прослушивания или грамматических упражнений, Shadowing заставляет мозг и мышцы рта одновременно обрабатывать и воспроизводить реальные речевые паттерны. Исследования показывают, что это значительно улучшает точность произношения, интонацию, ритм, связную речь, понимание на слух и беглость речи — что делает его одним из самых эффективных методов для подготовки к IELTS Speaking и реального общения на английском.

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Что такое техника Shadowing?