Hi. For the next 30 minutes, you're the AI. Pay attention!
Why AI has a weird attention span you must learn to manage
A long chat behaves like a long call: its attention is a limited window, so you manage what goes into it.
Thought experiment
How attention works: you versus an AI.
Let's start light. You're only human.
So, how's your attention?
- 1Fine
- 2Sweating
- 3Fried
Thought experiment Page 1 of 2
The long phone call
Called to settle one thing. An hour later you remember the start, the end and one standout, and the one thing you called for is still open.
- Let's sort out the holidays!
- Yes! But first, did you hear about Mum’s new phone?
Primacy effect (opens in a new tab): the first line sets the frame.
- No, what happened?
- She sent me forty photos of her thumb.
- Ha! Did you see the neighbours’ renovation?
- Don’t get me started. And my back hurts again.
Serial-position effect (opens in a new tab): mum’s phone, the renovation, the back: said, not kept.
- And Pepper ate a whole birthday cake, candles included!
Von Restorff effect (opens in a new tab): the cake is unlike the rest of the call.
- Did you try that new recipe?
- Not yet. Oh, dinner is ready, I have to run.
- Talk soon, bye!
Recency effect (opens in a new tab): the last minutes are still fresh.
…wait, we never fixed the date.
The pattern is measured on word lists in the lab; that it holds for an hour-long call is an inference
Thought experiment Page 2 of 2
AI forgets the middle too
A long AI chat has the same shape as the call: the very first instructions and the newest messages get used, and what you decided after them, your first message included, can get lost.
- Let's sort out the holidays!
- Yes! But first, did you hear about Mum’s new phone?
- Plan a summer party for our team: 40 people, end of June.
- Happy to help! Indoor or outdoor? Any dietary needs?
- Let’s cap the holidays at 2,000 euro.
- Deal! She sent me forty photos of her thumb.
- Ha! And my back hurts again.
- Let’s keep the budget at 40,000 euro.
- Noted! Three venues in Lisbon: Quinta terrace, LX Factory rooftop, Estrela pavilion.
- Fetched 10 pages · 15k of extracts
- Right, the holidays! What’s our budget?
- We settled that an hour ago!
- Great, put the full plan together.
- Here is the full plan: venue 28,000 €, catering 16,000 €, band 8,000 €. Total 52,000 €.
With your sister, a lost detail is funny. With a deadline, it’s expensive.
Measured by planting a fact in a long input, not in today’s chat apps · how deep the middle dips varies
The AI's attention span
Now the cause: how the AI holds a chat.
Dialling it up. I hope you are ready?
Still with me? How's your attention?
- 1Fine
- 2Sweating
- 3Fried
The AI's attention span Page 1 of 4
The context window
The whole chat is handed over with every message, and the space is limited: the context window.
CLAUDE.mdStep 9 of 21: The AI answers in three lines, +18 tokens, 26% used.
- With every message
The AI is handed the whole chat again , its own replies included .
- The limit
The space for it is limited. That limit is the context window.
- In chat apps
Apps may manage the window their own way.
illustrative numbers
The AI's attention span Page 2 of 4
What happens when the context fills up
As the chat fills the window, only the very beginning and the newest stay sharp, the rest blurs, your own first message included, one repeated detail survives, and answers get worse: context rot.
CLAUDE.mdOnly the very first lines and the newest messages stay sharp. Your first message and the rest spread thin.
Step 24 of 28: Conversation compacted, −141,045 tokens, 22% used.
… budget 40,000 euro.
the AI may fill this gap itself… Total 52,300 euro.
the budget got forgottenYour first message already falls off, and it is one short number among many similar ones
Studies use planted facts, not chat apps
The AI's attention span Page 3 of 4
Attention is a budget
A hundred units of attention go mostly to the very first lines and the newest messages; everything between, your own first message included, gets what is left, until it is too thin to trust.
Only the very first lines and the newest messages stay sharp. Your first message and the rest spread thin.
Step 21 of 21: The AI's plan: 52,300 euro, +30 tokens, 64% used, past Matt Pocock's smart zone.
Known as
“Lost in the middle”
The very first lines and the newest messages get the attention ; what sits in between, your first message too, fades .
Where the middle gets too thin differs per model and task. illustrative numbers
The AI's attention span Page 4 of 4
What we learned so far
Long AI chats show the same effects as long calls, because the AI's attention span is its context window: a limited resource you manage actively.
Human attention
- Let's sort out the holidays!
- Yes! But first, did you hear about Mum's new phone?
- No, what happened?
- She sent me forty photos of her thumb.
- Ha! Did you see the neighbours' renovation?
- Don't get me started. And my back hurts again.
- And Pepper ate a whole birthday cake, candles included!
- Did you try that new recipe?
- Not yet. Oh, dinner is ready, I have to run.
- Talk soon, bye!
Our memory follows the primacy and recency effects: we recall the start, the end and the standout.
AI attention (context window)
Step 21 of 21: The AI's plan: 52,300 euro, +30 tokens, 64% used, past Matt Pocock's smart zone.
- Important information and decisions get lost in the middle.
- When the window is full, auto-compaction can drop details without telling you.
Learn to manage attention: optional for you, mandatory for AI.
What fills the window
Your messages are only a part of it.
How's the brain? Anything fried yet? I eat 200K for breakfast.
Quick check: how full are you?
- 1Fine
- 2Sweating
- 3Fried
What fills the window Page 1 of 3
What's really in the context window
The chat is only the part you see. Before your first word, the context window already holds instructions and notes about you.
Starting instructions
Before you type anything, the app hands the AI hidden instructions: who it is, how to answer, which tools it may use. They sit at the very top and travel with every message.
Step 21 of 21: The AI's plan: 52,300 euro, +30 tokens, 64% used, past Matt Pocock's smart zone.
Starting instructions
Text placed before your first message, before you type anything.
The longer they get, the more room they take and the less closely they are followed.
Memory
Short notes about you, saved earlier and put back in front of the AI, so a new chat already knows you.
Claude and Gemini keep memory across chats too.
Named today, not explained
- Files the AI read
- Web pages
- Results from tools and connectors
- System reminders
Past chats are fetched only when asked, not loaded up front .
What fills the window Page 2 of 3
One innocent question
One line in the chat. Twenty pages in the window.
The AI read catering-offers.pdf
Glob finds the file; Read takes PDFs over 10 pages in ranges of at most 20, as page text plus page images, about 2,700 tokens a page:
Read("offers/catering-offers.pdf", pages="1-20") → 55,000 tokensStep 12 of 21: The AI picks a caterer, +15 tokens, 54% used, past Matt Pocock's smart zone.
One line in the chat, the whole file behind it
To answer, the AI read all 20 pages of the catering PDF, not shown in the chat .
The two web searches before it brought back extracts, a modest bite . Both stay in the window for every later question .
Same scale, tokens
- Your question15
- Two web searches15k
- The catering PDF55k
- The answer15
What fills the window Page 3 of 3
The chat looks the same. The window doesn't.
Left, the full window; right, the same chat after auto-compaction. On screen it is still one ongoing chat.
A moment before · step 23
Step 23 of 28: The AI read the contract, +57,120 tokens, 93% used.
The fill reaches the space kept free for summaries.
The chat, before and after: the same
CLAUDE.mdStep 24 of 28: Conversation compacted, −141,045 tokens, 22% used.
Right after · step 24
Step 24 of 28: Conversation compacted, −141,045 tokens, 22% used.
One block in place of every message ; details can drop out
Most chat apps never show you how full the window is.
Claude summarises older messages in the background ; the others document nothing about it .
Managing the attention span
You can't read a gauge, so you build habits.
Almost there. One more thing, then I compact you.
Last check: how's your attention?
- 1Fine
- 2Sweating
- 3Fried
Managing the attention span Page 1 of 4
Everyday habits
Split the project into jobs, keep each chat to one job, and carry only a short handoff into the next one, so the new chat starts small and sharp.
Break it down
Split the project into jobs before the first chat.
New job, fresh chat
When the topic changes, open a new chat.
Ask for a handoff
After real progress or before a break: the goal, the decisions, the next step.
Read it, correct it
Fix what is wrong before you carry it on.
Start the next chat with it
Paste it in as the first message.
Check the context if you can
In agentic tools, run
/contextregularly.
Token counts are illustrative · 200K window
Managing the attention span Page 2 of 4
The workflow for bigger projects
Break the project down first, keep one chat as the planner, and give each step a fresh chat that hands back one small result.
One chat for everything
Past the smart zone; every step carries every other step's reading.
A workflow: one planner, a fresh chat per step
One small result back per step. Short tasks beat one long one ; you coordinate, like a project manager.
Token counts are illustrative · 200K window
Managing the attention span Page 3 of 4
Human in the loop workflow
You are the captain: a planner chat prepares each handoff, worker chats do the jobs, and you check every artifact in between.
Plan a summer party
Break it down- Travel
- Catering
- Venue
- Invitations
- Budget
Interview
Interview yourself with AI- AI asks you3 questions,
1 you forgot
- AI asks you3 questions,
Requirements
Requirements firstGate 1
Requirements card
- 200 guests
- €150 per person
- Step-free
- Vegetarian menu
- Quiet to talk
Signed off
Research
Fresh start for each piece- Venue 1Checked against the card
- Venue 2Checked against the card
- Venue 3Checked against the card
Compare
Evaluate each step- Rank 3 venuesagainst the cardGate 2
Recommendation
for your bossVenue plan
by Friday
A fresh chat for each job keeps every window small; you coordinate, like a project manager.
Managing the attention span Page 4 of 4
Congratulations
Now you know how it feels. One more time? Or again in a minute?