xAI's next flagship AI model is nearly ready. Elon Musk confirmed on Sunday that Grok foundation model V9-Medium — a 1.5 trillion parameter model — has completed its training phase with evaluations described as positive. A public release is now approximately two to three weeks away.
One notable detail in Musk's announcement: a significant volume of Cursor data was incorporated during supplementary training, with more still to come. Cursor — the AI-powered coding assistant — suggests xAI is doubling down on developer and coding use cases for this generation of Grok. Supervised fine-tuning is already underway, with reinforcement learning set to begin within days.
According to background research, V9-Medium represents a substantial jump from the previous V8 model, which ran on roughly 0.5 trillion parameters. At 1.5T, V9-Medium is three times the scale of its predecessor — a meaningful leap that typically translates to stronger reasoning, better instruction-following, and improved performance on complex tasks. The public release timeline of two to three weeks aligns with the fine-tuning and RL pipeline wrapping up before a broader rollout.
For Tesla and xAI watchers, the Cursor data angle is worth tracking. If Grok V9-Medium ships with materially stronger coding capabilities, it could accelerate xAI's positioning as a developer-first AI platform — and raise the bar for what's expected from the Grok integration inside Tesla vehicles and the X platform going forward.
Sources & reporting notes
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- @elonmusk on X (2026-05-25T05:48:57.000Z) — Direct source
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