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Version history

Every shipped version of this model. Click a marker to open its release page.

44 Heavy4 Fast4.14.1 FastJul '25Jul '25Aug '25Sep '25Oct '25Nov '25Dec '25calendar time

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AI Model

Grok

byxAI

xAI's frontier Grok model family for reasoning, coding, and real-time knowledge.

Latest version:4.3Rumored

All Versions

Grok 4.3

Rumored
Rumored to be released on April, 2026
Why it's rumored:PiunikaWeb reported Grok 4.3 beta appearing in the SuperGrok Heavy model picker without an x.ai/news announcement; xAI had not published a model card or API pricing at the time of the first sightings.
What to expect:Stealth beta for SuperGrok Heavy with native video input, document generation (slides, PDF, spreadsheets), and a larger checkpoint Musk described as still training after the initial 500B-parameter beta.
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Grok 4.1 Fast

Released
Released on November 19, 2025
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Grok 4.1

Released
Released on November 17, 2025
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Grok 4 Fast

Released
Released on September 19, 2025
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Grok 4

Released
Released on July 9, 2025
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Grok 4 Heavy

Released
Released on July 9, 2025
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