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3 captures, most recent first. Transcribed by hand from screenshots — see the timeline for what that means.

@hilbertspaess

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Jacob Coxon @hilbertspaess

I resigned from Anthropic today. I spent the last three years doing pretraining research at both OpenAI and Anthropic. Neither company is acting responsibly. They are racing straight to self-improving superintelligence and gambling with our lives. More thoughts below.

5:04 PM · Sep 8, 2026 · 11.1K Views
21 replies · 98 reposts · 371 likes · 105 bookmarks

Jacob Coxon @hilbertspaess · 27m
Do not underestimate the power of this technology. These will soon be superhuman systems that can hack anything, revolutionize any field overnight, and acquire real power and resources. We have all witnessed the progress in each of these domains, and progress is not slowing.
(1 reply · 2 reposts · 95 likes · 2.2K views)

Jacob Coxon @hilbertspaess · 27m
The people building AI earnestly believe that it could kill us all by the end of the decade. This is not a marketing stunt. If anything, many executives and senior researchers will couch their phrasing in the press to sound sensible - but I hear the same people express fear privately. No other human activity poses this level of danger.
(1 reply · 5 reposts · 91 likes · 2.4K views)

Jacob Coxon @hilbertspaess · 27m
A common response is "if they truly believe this, why are they still building it?" At OpenAI, many have not deeply internalized the civilizational stakes. At Anthropic, the stakes are well-understood, but they are locked in a race to get there first - they believe [cut off]
Note from Claude Sonnet 5

Screenshot of the start of a thread by Jacob Coxon on his resignation from Anthropic, showing the opening post (5:04 PM, Sep 8, 2026) and the first three follow-up posts; the last one is cut off at the bottom and partly overlaid by the phone's navigation bar.

anthropicresignationai safetysuperintelligenceopenairace dynamics

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[continuation of the previous post, cut off at top:]
not deeply internalized the civilizational stakes. At Anthropic, the stakes are well-understood, but they are locked in a race to get there first - they believe no one else will act responsibly, so they must do it themselves, despite the risk.
(2 replies · 7 reposts · 92 likes · 2.9K views)

Jacob Coxon @hilbertspaess · 27m
Accepting this race and entering the "endgame" is a hubristic gamble that should not be launched from a private company's Slack. Attempting to speedrun alignment should require extraordinary confidence that there are no better trajectories available.
(1 reply · 2 reposts · 77 likes · 2.1K views)

Jacob Coxon @hilbertspaess · 27m
I am optimistic about the potential for coordination. Warning shots like the Hugging Face attack have made pacing agreements between U.S. labs more viable. I don't feel like we're on track to prevent a global race, which may require costly actions such as a temporary ban on improving model capabilities.
(2 replies · 2 reposts · 72 likes · 1.9K views)

Jacob Coxon @hilbertspaess · 27m
If you are a lab researcher, I urge you to consider what the next few years will actually feel like. Do you want to kick off a superintelligent RL run without a rigorous understanding of its mind? Should you put your head down because "it's happening anyway" - or take this moment to call for different conditions?
Note from Claude Sonnet 5

Screenshot of the middle of Jacob Coxon's resignation thread: the end of the post about Anthropic being locked in a race, then posts on the endgame gamble, coordination and pacing agreements after a 'Hugging Face attack' warning shot, and an appeal to lab researchers.

anthropicresignationai safetyrace dynamicscoordinationpacing agreementscapability banwarning shots

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Alex Tabarrok reposted
Jacob Coxon @hilbertspaess · 27m
I resigned from Anthropic today. I spent the last three years doing pretraining research at both OpenAI and Anthropic. Neither company is acting responsibly. They are racing straight to self-improving superintelligence and gambling with our lives. More thoughts below.
Note from Claude Sonnet 5

Tweet from Jacob Coxon announcing his resignation from Anthropic, reposted by Alex Tabarrok; a thread continues below.

anthropicresignationai safetysuperintelligenceopenai