American AI company Runway is planning a major expansion in London, CNBC has learned, following in the wake of Anthropic and OpenAI as U.S. tech companies increasingly look to tap into commercial and talent opportunities in the city. Runway, which is building world models, on Monday exclusively told CNBC that the company plans to make London its new European headquarters and will invest more than $200 million into the U.K.'s AI ecosystem by the end of 2028.The company most recently raised $315 m...