Sam Altman’s AI model has defeated Elon Musk’s Grok in the first-of-its-kind chess tournament between leading artificial intelligence systems.

OpenAI’s o3 model swept xAI’s Grok 4 with a flawless 4–0 victory in the final of the Kaggle AI Exhibition Tournament, held on Thursday. Both models advanced to the final after defeating AI competitors from Anthropic, DeepSeek, Google, and Moonshot AI.

The matchup carried personal significance, as Mr Altman and Mr Musk co-founded OpenAI a decade ago before Musk left to launch his own rival AI company, xAI.

Their relationship has since broken down, with Mr Altman, who is now the chief executive officer of OpenAI, labelling his former friend a “bully” after Mr Musk made an unsuccessful attempt to buy the ChatGPT creator.

In response to Grok 4’s

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