If OpenAI LLC were a listed company, Monday would have been a very bad day for the stock. But Chief Executive Sam Altman also happens to be chairman of another, less well-known company that is listed,

Sam Altman hailed the Chinese firm's low-cost AI model as "impressive" and said OpenAI would accelerate the release of "better models" in response.

OpenAI CEO Sam Altman said the AI startup will release better models than those of China's DeepSeek, whose powerful low-cost AI model triggered a tech selloff in the U.S. and called into question Silicon Valley's lead in the global AI race.