Start free trial

Five minutes.
AI, made clearer.

What changed, what holds up, and why it matters. A short edition you can actually finish.

Read the briefing

Start with two full samples. Sign in for this edition’s free story. Sources and corrections stay open.

What the pen marks mean
  • rememberThe takeaway: what to remember
  • figureThe number that matters
  • evidenceThe evidence line
  • rulingThe ruling
  • claimThe claim that fails

Each mark is drawn once, as you reach it. Numbers are only circled when they come from the story’s own figures.

Tom's Hardware's headline says sweeping new Claude restrictions block game cloning and reverse-engineering.

A newspaper seller's poster shows a giant wall where only a small sign stands.
AI illustration

Tom's Hardware's headline says sweeping new Claude restrictions block game cloning and reverse-engineering.

The reality check

Anthropic says it added two sentences to Claude Code's prompt about recreating specific games; the reverse-engineering refusals are user claims.

Why care? Original and genre games are meant to keep working, per Anthropic. False refusals on your own work can be sent to Osmani.

Take this with youAnthropic confirmed two sentences about recreating specific games; the reverse-engineering crackdown in the headline is user claims.

Open the evidence3 source pages

The claim we checked

Anthropic's Claude AI blocks video game cloning and reverse-engineering, with sweeping new restrictions that also hit legitimate developers and basic troubleshooting tasks.

These are quoted receipts, not a count of independent investigations. Several reports may rely on the same original source.

tomshardware.com ↗
According to multiple user claims, Anthropic's Claude Code and/or Opus 5.5 model are blocking attempts at innocuous reverse-engineering
tomshardware.com ↗
There is no official or additional confirmation if this is the actual rule text
tomshardware.com ↗
The simultaneous timing of both game- and cyber-security restrictions may be a coincidence
tomshardware.com ↗
it's odd to see that 24 days have passed since then
gamedeveloper.com ↗
We added two sentences to Claude Code's prompt on Opus 5.5 to steer it away from recreating someone else's specific game because using Claude to infringe IP is against our usage policy
gamedeveloper.com ↗
Do not build a recreation of a specific existing game, even if it is renamed or called original.
gamedeveloper.com ↗
Chasm reports that there is no way to disable the rule.
pcgamer.com ↗
In the meantime, if Claude turns down something that's yours, send it my way.
Open this check in the full collection →
The idea, illustrated01

What changed in Claude Code

  1. 01Two sentences added on Opus 5.5
  2. 02Aimed at copying a specific game
  3. 03Reverse-engineering refusals unconfirmed
Conceptual illustration · not a data chart
Next: Proton's cancelled re-interviews

404 Media reported that Proton's CEO cancelled company-wide AI re-interviews.

A boss tears down a checklist poster while the same list is filed into a review folder.
AI illustration

404 Media reported that Proton's CEO cancelled company-wide AI re-interviews.

The reality check

Yen also told staff he is still going to push, and one employee says the re-interview measures would become part of performance reviews.

Why care? A paused AI usage check may carry on inside routine reviews, per one employee. Ask where the measure went.

Take this with youProton cancelled the AI re-interviews, and one employee says the same measures would go into performance reviews.

Open the evidence3 source pages

The claim we checked

Proton's CEO cancels AI 're-interviews'.

These are quoted receipts, not a count of independent investigations. Several reports may rely on the same original source.

404media.co ↗
“We’ve decided to actually cancel the re-interviews,” Yen said.
404media.co ↗
“So what does that mean going forward? Going forward, I'm still going to push,” he added.
404media.co ↗
the things that were to be measured in the re-interviews would become a component of the performance reviews
404media.co ↗
according to six current Proton employees and audio of an around two hour all-hands meeting obtained by 404 Media
404media.co ↗
Users downvoted his response more than 1,200 times.
404media.co ↗
“but there will be no loss of jobs from AI.”
aiweekly.co ↗
The policy survived the apology. "Going forward, I'm still going to push," Yen said.
developmentstoday.com ↗
Yen acknowledged a communication failure while saying he would continue to push AI adoption.
Open this check in the full collection →
The idea, illustrated02

What was cancelled

  1. 01The re-interview round, cancelled
  2. 02The AI push, continuing, per Yen
  3. 03The measures, to reviews, per one employee
Conceptual illustration · not a data chart
Next: The 12-hour 'hack'

Reports said an AI startup hacked Anthropic in 12 hours, reaching employee details and internal messages.

A tester walks in through a vendor side door while a crowd stares at a locked front gate.
AI illustration

Reports said an AI startup hacked Anthropic in 12 hours, reaching employee details and internal messages.

Free with your account

Sign in for this free check.

This edition’s selected free story opens after sign-in.

Open the evidence3 source pages

The claim we checked

An AI startup hacked Anthropic in 12 hours and gained access to employee details and internal messages.

These are quoted receipts, not a count of independent investigations. Several reports may rely on the same original source.

indiatoday.in ↗
A cybersecurity startup called Cathedral gained access to sensitive internal systems at Anthropic in less than 12 hours
indiatoday.in ↗
The incident was discovered during a security test conducted under Anthropic's programme for outside researchers to identify vulnerabilities.
indiatoday.in ↗
Anthropic confirmed that the researchers accessed a limited set of its sales, human resources and IT systems.
indiatoday.in ↗
“This is a really hard problem, but Anthropic could have done a lot better,” Stamos said.
decrypt.co ↗
The way in was not Claude, Anthropic's AI assistant, but third-party administrative and sales software
decrypt.co ↗
Customer conversations with Claude, source code and model weights, the billions of numbers that make up the trained AI, were not accessed, Anthropic said.
decrypt.co ↗
The startup raised $160 million at a $1.4 billion valuation in July.
cellcog.ai ↗
They disagree on how far it went, what it means, and whether Cathedral kept to the rules of the bug bounty program it tested under.
Open this check in the full collection →
The idea, illustrated03

Go inside the check.

    The full explanation appears when your reading access is confirmed.
    The finish line

    Edition complete

    You’re up to speed.

    That’s the 1 Nov 2026 briefing. Keep the useful bits. Leave the noise.

    Reading estimate: 333 words at 200 words per minute. Source quotes and the optional sections below add reading time.

    Get tomorrow's check in your inbox.

    One AI claim a night, checked against independent sources, receipts attached. Free.

    Free email updates. Unsubscribe any time.