Grok 4 Fast

xAI · Grok Fast line · lightweight

Released September 20, 2025Replaced by Grok 4.1 Fast

What changed

No verified summary yet. We only publish what the maker's own numbers support, so this card fills in as the sources come in.

Where the Grok Fast line stands

Grok 4.1 Fast is the current model in this line. The card shows how long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.

Grok 4.1 Fast

xAI · Grok Fast line · lightweight

Quiet296 days without a release — longer than any past gap

Released Nov 17, 2025 · what changed →

Days since last release

Grok 4.1 Fast · Nov 17, 2025

296

days

Usual gap

days

Recent gaps

Grok 4.1 Fast · Nov 2025

Every Grok Fast release

Newest first. See the full line with every card →

Nov 17, 2025Grok 4.1 Fast
Sep 20, 2025Grok 4 Fast · this page

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