AI researcher Andrew Tulloch departs Meta to join Anthropic

The short version

• Prominent AI researcher Andrew Tulloch is leaving Meta to join Anthropic.[Business Insider]
• He will focus on optimizing artificial intelligence training and inference processes.[Business Insider]
• A representative for Anthropic confirmed Tulloch is scheduled to begin his new role next week.[Business Insider]
• Tulloch previously spent 11 years at Meta, worked at OpenAI on models including GPT-4o, and cofounded Thinking Machines Lab.[Business Insider]

Key facts

• Andrew Tulloch is leaving Meta to take a position at Anthropic.[Business Insider]
• At Anthropic, Tulloch will work on optimizing AI training and inference.[Business Insider]
• An Anthropic spokesperson stated that Tulloch is scheduled to begin next week.[Business Insider]
• Tulloch worked at Meta for 11 years before moving to OpenAI in 2023, where he contributed to training GPT-4o, GPT-4.5, and o3 models.[Business Insider]
• Tulloch cofounded Thinking Machines Lab in 2025.[Business Insider]
• The Wall Street Journal reported that Tulloch rejected a compensation package from Meta CEO Mark Zuckerberg that could have reached $1.5 billion.[Business Insider]

Sources

Outlet counts describe coverage, not independent confirmation. Reports may share a wire service or original source.

• Top AI researcher Andrew Tulloch ditches Meta to work on training and inference at AnthropicBusiness Insider metered