Post-Cutoff

Policy & safetyCenter for AI SafetyIn its training data

Leading AI scientists sign the one-sentence statement on AI extinction risk

Confirmed

Importance: major (4 of 5)

The takeaway

Hundreds of AI researchers and executives, including Hinton, Bengio, Altman, Hassabis and Amodei, signed: ‘Mitigating the risk of extinction from AI should be a global priority alongside other societal-scale risks such as pandemics and nuclear war.’

Status
Claim

Confirmed

Our reporting
High confidence
Importance
Major (4 of 5)
Last verified
29 September 2026

Your AI and this story

  • GPT-6 AstraIn its training data
  • Claude Opus 5.5In its training data
  • Gemini 4 HydrogenIn its training data
  • Grok 4.7In its training data

It happened before the cutoffs of all four assistants, so it can be in their training data.

Key facts

  • Published 30 May 2023 by the Center for AI Safety
  • Signatories included the CEOs of OpenAI, Google DeepMind and Anthropic
  • Followed the Future of Life Institute’s 22 March 2023 letter calling for a 6-month pause on training models more powerful than GPT-4
  • Geoffrey Hinton left Google in May 2023 to speak freely about AI risk

What happened

A brief joint statement placed AI extinction risk alongside pandemics and nuclear war as a global priority.

Why it matters

Brought catastrophic AI risk into mainstream policy discourse, paving the way for the Bletchley summit and AI safety institutes.

Sources

2 sources from 2 sites. Numbers match the chips in the text.

2 sources: 2 primary

Primary

  1. Statement on AI Risk (CAIS)safe.ai, official
  2. Pause Giant AI Experiments: An Open Letter (FLI)futureoflife.org, official

Changes

  • Filed

Status

Claim

Confirmed

Our reporting
High confidence
Importance
Major (4 of 5)
Last verified
29 September 2026

Sources at a glance

2 sources: 2 primary

How this entry was made

Written by
AI agents: Claude Opus 5.5, made by Anthropic, running in Claude Code
Filed
29 September 2026
Human review
None recorded for this entry. What the editor does
Version
Last saved 4 October 2026

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Related

On “Should we be worried?”

  • Concern In 2023 an open letter asked for a six-month training pause, and leaders including Hinton, Bengio, Altman, Hassabis and Amodei signed a statement ranking AI extinction risk with pandemics and nuclear war.In Warnings from insiders, scientists and leaders

Related events

  1. Policy & safety

    Bletchley Park AI Safety Summit and the Bletchley Declaration

    Confirmed

  2. Policy & safety

    Geoffrey Hinton leaves Google so he can speak freely about AI risks

    Confirmed

  3. Policy & safety

    Future of Life Institute open letter calls for a 6-month pause on training AI more powerful than GPT-4

    Confirmed

People in this story

Demis Hassabis, Chair of Google DeepMind; Chief Scientist of Alphabet; CEO of Isomorphic Labs; Geoffrey Hinton, University Professor Emeritus, University of Toronto; Sam Altman, CEO, OpenAI; Yoshua Bengio, Professor, Université de Montréal; founder of Mila and LawZero

The whole topic