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Noam Shazeer is leaving Google for OpenAI, just two years after Google paid $2.7 billion to poach Shazeer and part of his team at CharacterAI.

Why it matters: This shows the limits of acqui-hires, in which the most valuable assets can walk out the door once retention periods end.

Go deeper, via The Information: "Shazeer's hiring is a major win for OpenAI in the AI talent wars, as OpenAI competes to catch up with archrival Anthropic's most advanced models ahead of the two companies' hotly anticipated IPOs." — Erin Woo & Amir Efrati, The Information