xAI launches Grok V9-Medium, a coding-focused model
Grok V9-Medium, a 1.5-trillion-parameter model trained on real Cursor session data, arrived on Grok and SuperGrok on June 16.
What V9-Medium is
xAI launched Grok V9-Medium on June 16, 2026, a 1.5-trillion-parameter model — three times larger than the previous production model — aimed specifically at coding tasks.
Trained on Cursor data
According to xAI, the model was trained on a large volume of real development sessions from the Cursor editor (acquired by SpaceX), including how developers describe requirements, navigate codebases, and iterate on fixes over long sessions.
Not Grok 5
xAI stresses that V9-Medium is a separate model from Grok 5, the flagship still in training and estimated at around 6 trillion parameters — V9-Medium is specifically coding-focused, not a replacement for the company's main model.
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