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Andrew Tulloch Leaves Meta for Anthropic Training and Inference Role

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Andrew Tulloch is leaving Meta after less than a year, having previously worked there for 11 years before joining OpenAI in 2023 to help train GPT-4o, GPT-4.5, and o3. He also co-founded Thinking Machines Lab in 2025 and joined Meta again in October. His move to Anthropic comes shortly after Meta launched Muse; both Tulloch and Meta did not comment, as Anthropic prepares for an IPO amid growing AI safety concerns.

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