models · xai

Grok-4.1 Fast

Grok-4.1 Fast with extended 2M token context. Both reasoning and non-reasoning modes.

What this registry has checked

Quarantine. We hold the publisher’s own published hash for these weights and have recorded it against this entry. We have not downloaded and hashed the weights ourselves, so the hash is the publisher’s claim, not our measurement.

Weight file SHA-256	5536a1c4dfc067d68848a96e2032c492f815926f783c92104fd080aceefd16af
Method	closed-weights

Re-check this yourself → Source → Full record →

What is recorded

Publisher	xai
Origin	United States
Licence	xAI-TOS
Pulls recorded here	95,763

Reported scores

MMLU-Pro	74.3
GPQA Diamond	63.7
AIME 2025	34.3
LiveCodeBench	39.9
IFBench	36.5
Humanity's Last Exam	5.1

Reported by a third party and recorded here, not re-run by us. Source: artificialanalysis.ai/api/v2.

Elsewhere in the registry

All models → Browse with filters → What will run on my hardware? →

Registry record as of 2026-09-28. Identity, licence and parameter count are properties of a release and do not move; tier can, and the verify link above re-checks it against the live registry rather than this page.