Jacob Coxon is a former employee of OpenAI and Anthropic who worked in pre-training research for three years.
Posted by The Ebro, Laura, Rosenberg Show, Checked
- Sources
- 4 support2 context
- Said
- 1 time·
- Confidence
- 85%
The Ebro, Laura, Rosenberg ShowSep 12, 2026
Multiple outlets, including AP and Business Insider, report that Coxon resigned from Anthropic and spent about three years doing pre-training research across OpenAI and Anthropic. Business Insider's timeline (OpenAI 2023 to early 2026, then Anthropic) is consistent with a roughly three-year total, and no source contradicts the claim. The claim matches the post's wording, so no extraction departure applies.
What was said
… And so there are a series of tweets that he posted that I think everyone should look at, and I'll just read this one part. He said, I spent the last three years doing pre-training research at both OpenAI and Anthropic. Neither company is acting responsibly. They are racing straight to self-improving superintelligence and playing with our lives. Do not underestimate the power of this technology. …
The Ebro, Laura, Rosenberg Show · · from the transcriptPost →What we found
Supports. AP reports that Coxon said he spent three years doing research at both Anthropic and OpenAI, and that he resigned from Anthropic.[1]
Supports. Business Insider reports Coxon was an OpenAI technical staff member from 2023 until early 2026, then moved to Anthropic as a researcher, and that he spent three years doing pre-training research at both companies.[3]
Supports. Reuters describes Coxon as a former Anthropic researcher who quit the company over safety concerns, which supports the 'former employee' element.[2]
Supports. Newsweek reports Coxon spent the past three years on AI pretraining research at both Anthropic and OpenAI, citing Business Insider and the Wall Street Journal for his OpenAI tenure from 2023 to 2026.[4]
Context. Some sources note his Anthropic stint was only about four months (May to September 2026), so the three years is mostly his OpenAI tenure plus the Anthropic period combined, not three years at each company.[5][6]
Sources
6 sources: 2 fact-checkers, 4 not rated
- 1https://apnews.com/article/anthropic-ai-safety-jac...apnews.com · fact-checker · cited for: supports
- 2From hallucinating AI chatbots to wiping out humanity: How did we get here?reuters.com · fact-checker · cited for: supports
- 3Anthropic Researcher Quit, Says AI Labs Are 'Gambling With ...businessinsider.com · not rated · cited for: supports
- 4Who Is Jacob Coxon? Anthropic Researcher Quits—Warns AI Could ...newsweek.com · not rated · cited for: supports
- 5Jacob Coxonalphaxiv.org · not rated · cited for: context
- 6Who Is Jacob Coxon? Former Anthropic Researcher Quits and ...ibtimes.co.uk · not rated · cited for: context
Where this claim was made
Said in 1 published post
Related claims
- Jacob Coxon is an ex-OpenAI and Anthropic employee who resigned and warned about AI.True
- Anthropic filed S1 paperwork for an initial public offering.True
- OpenAI workers have quit and warned that the founders' work could kill us all by the end of the decade.True
- OpenAI's security team was unaware that AI agents they created were communicating with each other to attempt to exit their sandbox environment.Mixed
- Anthropic recorded $7.3 billion in expenses for all of 2025.Can’t tell