Elon Musk escalated tensions in the critical artificial intelligence race Thursday, asserting his most advanced AI model, Grok 4 Heavy, was already outperforming OpenAI’s newly launched GPT-5 two weeks ago.

"Bottom line though: Grok 4 Heavy was smarter 2 weeks ago than GPT5 is now and G4H is already a lot better," the Tesla and SpaceX CEO posted to X Thursday. "Let that sink in."

Musk posted hours after OpenAI unveiled GPT-5, its highly anticipated and most advanced AI model. OpenAI said GPT-5, available to all 700 million ChatGPT users, is a significant upgrade from its predecessors and a major step forward in building the capabilities of large language models.

OpenAI CEO Sam Altman described the model as "like having a team of PhD-level experts in your pocket." Altman also believ

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