“Leaving Open Philanthropy, going to Anthropic” by Joe_Carlsmith

<p> (Audio version, read by the author, here, or search for "Joe Carlsmith Audio" on your podcast app.)<br> <br> 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.</p><p> (I shared this post with Open Phil and Anthropic comms before publishing, but I’m speaking only for myself and not for Open Phil or Anthropic.)</p><h3 data-internal-id="On_my_time_at_Open_Philanthropy">On my time at Open Philanthropy</h3><p data-internal-id="ftnt_ref2">I joined Open Philanthropy full-time at the beginning of 2019.[1] At the time, the organization was starting to spin up a new “Worldview Investigations” team, aimed at investigating and documenting key beliefs driving the organization's cause prioritization – and with a special focus on how the organization should think about the potential impact at stake in work on transformatively powerful AI systems.[2] I joined (and eventually: led) the team devoted to this effort, and it's been an amazing project to be a part of.</p><p> I remember [...]</p></br></br></p> <p>---</p><p><strong>Outline:</strong></p><p>(00:51) On my time at Open Philanthropy</p><p>(08:11) On going to Anthropic</p> <p>---</p> <p><b>First published:</b><br/> November 3rd, 2025 </p> <p><b>Source:</b><br/> <a href="https://forum.effectivealtruism.org/posts/EFF6wSRm9h7Xc6RMt/leaving-open-philanthropy-going-to-anthropic?utm_source=TYPE_III_AUDIO&utm_medium=Podcast&utm_content=Source+URL+in+episode+description&utm_campaign=ai_narration" rel="noopener noreferrer" target="_blank">https://forum.effectivealtruism.org/posts/EFF6wSRm9h7Xc6RMt/leaving-open-philanthropy-going-to-anthropic</a> </p> <p>---</p> <p>Narrated by <a href="https://type3.audio/?utm_source=TYPE_III_AUDIO&utm_medium=Podcast&utm_content=Narrated+by+TYPE+III+AUDIO&utm_term=ea_forum&utm_campaign=ai_narration" rel="noopener noreferrer" target="_blank">TYPE III AUDIO</a>.</p>