Grok 4.5 has been developed using xAI’s new V9 foundation model

Grok 4.5 has been developed using xAI’s new V9 foundation model, which contains 1.5 trillion parameters and incorporates data from Cursor. This makes it roughly three times larger than its predecessor, the v8-small model, which had 0.5 trillion parameters. The V9 foundation model is described as a strong, reliable system comparable to Opus, rather than bringing a sudden leap in performance. Notably, the pace of advancements at SpaceXAI has accelerated, following a shift in focus by several leading engineers from Starlink and Starship projects to artificial intelligence development. The previous v8 model, used for Grok 4.3, was completed in December with several significant limitations. Grok 4.5 is expected to represent a substantial improvement in capability.

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