Musk Reveals All: Current Grok Data Flaws Severe, Internal 1.5T Upgrade Achieves Comprehensive Overhaul

According to Dynamic Insight monitoring, Musk publicly acknowledged rare shortcomings in the current open-source Grok 4.2 on X, revealing the version correlation between internal and external Grok versions: Grok 4.2 is based on the internal 8th version base model, with only 0.5T parameters, trained on the Hopper architecture GPU, with significant deficiencies in the quality, coverage, and proportion of training data.

The internal 9th version base model has completed training, with parameters expanded to 1.5T, specially optimized for the Blackwell architecture GPU, undergoing a comprehensive upgrade in data processing, training recipe, and model scale. Musk stated that the 8th and 9th versions are in completely different leagues. He also revealed that Cursor's data will be incorporated into subsequent supplementary training, marking the first mention of data integration since SpaceX acquired Cursor.

During the same week, The Information reported that the SpaceXAI pre-training team was left with only a few members after the departure of the team lead, with over 50 core developers leaving post-acquisition. Previously, Musk had pledged to release a new base model version every two weeks. The 1T parameter Grok 4.4, originally scheduled for delivery in early May, has not yet appeared. The newly announced 1.5T version aligns with the parameter specifications of Grok 4.5 from the previous roadmap, raising doubts about whether 4.4 has been skipped.