Mark Kretschmann
@mark_k · Apr 17, 2026
Grok 4.3 (beta) has been released by @xai 🔥🔥
The new version of Grok is currently available to the highest tier plan SuperGrok Heavy.
With 1T params Grok 4.3 is twice as big as Grok 4.20, and was also trained much longer. It should provide a decent jump in performance.
Elon Musk
@elonmusk
This is still 0.5T, but a more recent training checkpoint.
1T model is ~5 days away from finishing initial training. Will be a major step change improvement in coding, long context and skills.
The SpaceXAI model factory is finally working. Should be an improved base model landing every ~2 weeks.
12:09 AM · April 18, 2026 · 377.7K views
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