Anthropic, OpenAI, and other AI startups have announced major London expansions over the past year, as the city emerges as a key AI talent hub outside the US (Kai Nicol-Schwarz/CNBC)

Kai Nicol-Schwarz / CNBC: Anthropic, OpenAI, and other AI startups have announced major London expansions over the past year, as the city emerges as a key AI talent hub outside the US — A slew of U.S. Big Tech and AI companies are racing to expand in London as they look to take advantage of the city's deep talent pools amid …