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Musk Says Grok 4.5 Entered Private Beta
Elon Musk announced that Grok 4.5, powered by a 1.5 trillion parameter foundation model, has entered private beta testing at SpaceX and Tesla.
What: Elon Musk revealed that Grok 4.5 utilizes a 1.5T V9 foundation model and was enhanced with data from the Cursor code editor during training. The model is currently undergoing reinforcement learning, with early internal evaluations suggesting performance levels competitive with OpenAI's o1-class Opus models.
Why it matters: This indicates a trend of integrating specific domain-expert data—like IDE-specific coding patterns—into foundation models to achieve performance gains in specialized tasks.
Decoder
- RL (Reinforcement Learning): A training method where an AI learns to make decisions by receiving rewards or penalties for its actions in a given environment.
Original article
Grok 4.5, based on our 1.5T V9 foundation model, with Cursor data added in supplemental training, is now in private beta at SpaceX & Tesla. Early evals show performance close to, perhaps exceeding Opus. RL is continuing to significantly improve the model, and the Grok Build harness gets better every day. Nice work by all those involved! Completely trained from scratch new models will be released by @SpaceX every month this year.
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