Alphabet loses $269B in market cap as key AI researchers jump ship to OpenAI and Anthropic

Alphabet paces for worst day in a year on AI concerns after high-profile exits

Alphabet down 7% as Gemini co-lead Shazeer joins OpenAI and AlphaFold's John Jumper moves to Anthropic, signaling AI talent exodus amid commoditization concerns. With $141B invested since October, investors now skeptical: if foundation models become interchangeable, Alphabet's vertical stack risks margin pressure over competitive advantage.