Grok 4.5 Launches Internal Tests at SpaceX and Tesla on 1.5T Parameter V9 Model

According to Musk, Grok 4.5 launched internal private testing at SpaceX and Tesla on June 28. The latest large language model is built on a 1.5 trillion parameter V9 base model and incorporates training data from Cursor, a popular AI coding tool. Early evaluations show the model's performance approaches or potentially exceeds Anthropic's Claude Opus. Reinforcement learning continues to significantly optimize the model, and the accompanying Grok Build benchmark is improving. Musk also stated SpaceX will release fully retrained new models monthly for the remainder of 2026.
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