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Elon Musk @elonmusk - Grok 4.20 Heavy (Beta 2) is extremely fast for deep analysis.
Beta 3 will have many fixes and functionality gains.
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Artificial Analysis @ArtificialAnlys
The Grok 4.20 Beta shows three major improvements over Grok 4:
lowest ever hallucination rate on the AA-Omniscience evaluation. When Grok did not know the answer, it hallucinated an incorrect answer 22 percent of the time this is the lowest hallucination rate of any model we have tested, topping Claude Haiku 4.5 (25 percent)
Top scores for instruction following and prompt adherence. On IFBench, Grok 4.20 takes the number 1 spot with 82.9 percent a +29.2 point increase on Grok 4
Leading speed for its intelligence. At 265 tokens per second output speed on xAIs API, Grok 4.20 is significantly faster than its peer and over 2x the output speed seen from Grok 4.1 Fast
Congratulations to xai and elonmusk on the 4.20 Beta 0309 launch!
https://x.com/elonmusk/status/2032201160791376030

Elon Musk @elonmusk - Welcome!
Orbital space centers and mass drivers on the Moon will be incredible.
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Jason Ginsberg @JasonBud
I’m proud to be joining SpaceX and xAI with @milichab