OpenAI announced its first permanent London office on April 13 — an 88,500 sq ft space at Regent Quarter in King's Cross with capacity for 544 people, expected to open in 2027, becoming its largest research hub outside San Francisco. Days later, Anthropic announced a new Knowledge Quarter office with capacity for 800 employees, a fourfold jump from its current 200 London staff. Both moves follow UK government outreach and reflect London's consolidation as the primary European AI hub alongside existing DeepMind, Meta, and Wayve presences.