Grok Fast
xAI · lightweight line
Latest: Grok 4.1 Fast · Nov 19, 2025
DiscontinuedOfficially discontinued on May 15, 2026
Days since last release
Days since last release
339
days
Recent gaps
Recent gaps
Grok 4.1 Fast · Nov 2025
61
The newest Grok Fast model is Grok 4.1 Fast, released on November 19, 2025. xAI officially discontinued the line on May 15, 2026.
Where the line stands
How long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.
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Every Grok Fast release
Newest first — what each version changed versus the one before, in xAI's own numbers.
Nov
19
2025
Sep
19
2025