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Musk says new 2T param Grok model to be trained on SpaceX engineering corpus

Elon Musk announced that the new 2 trillion parameter Grok model will be trained on SpaceX's engineering corpus, excluding ITAR-restricted material, to improve its engineering capabilities. Musk also stated that Grok Build outperforms Claude and Codex in side-by-side testing for complex coding tasks.

read1 min views6 publishedJul 21, 2026
Musk says new 2T param Grok model to be trained on SpaceX engineering corpus
Image: source

SpaceX’s massive corpus of world-class engineering data (excluding material blocked by ITAR) will be added during supplemental training of the 2T run. This will dramatically improve Grok’s engineering capabilities.

For the past few wks since Grok Build launch, we've run SxS testing of complex Codex & Grok Build tasks. Eliminated Claude for needy intern BS. Grok Build wins more trust w/ higher accuracy & less hand-holding. Codex remains solid; each has unique strengths. For heavy

source & further reading
twitter.com — original article
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