Published on November 3, 2025 5:38 PM GMT

(Audio version, read by the author, here, or search for “Joe Carlsmith Audio” on your podcast app.)

Last Friday was my last day at Open Philanthropy. I’ll be starting a new role at Anthropic in mid-November, helping with the design of Claude’s character/constitution/spec. This post reflects on my time at Open Philanthropy, and it goes into more detail about my perspective and intentions with respect to Anthropic – including some of my takes on AI-safety-focused people working at frontier AI companies.

(I shared this post with Open Phil and Anthropic comms before publishing, bu…

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