xAI · model passport

Grok 4 Fast Chat

grok-4-fast-chat

Cloud only
Proprietary licence
Released 2025-09-19(curated)

Overall · LMArena: 1,419#119 of 396
Best percentile: 70.2Overall
Cohort standing: 59.5median 52.2

What the data says

Benchmarked on 4 of 27 tracked axes. Every figure below is the model's own published result on that board.

Uneven: 5.8 percentile points between its best and worst axis — 70.2 pct on Overall versus 64.4 pct on Instruction following.

Overall70.2 pct1,419Verify →
Hard prompts66.2 pct1,432Verify →
Coding66 pct1,457Verify →
Instruction following64.4 pct1,395Verify →
WebDev ArenaNot benchmarked
Vision ArenaNot benchmarked
Factuality ArenaNot benchmarked
Search ArenaNot benchmarked
Document ArenaNot benchmarked
Agent ArenaNot benchmarked
GPQA DiamondNot benchmarked
AIME (math)Not benchmarked
FrontierMathNot benchmarked
SimpleQA VerifiedNot benchmarked
ARC-AGI-2Not benchmarked
Humanity's Last ExamNot benchmarked
SimpleBenchNot benchmarked
LiveBenchNot benchmarked
BFCL v4 (function calling)Not benchmarked
SWE-bench Verified (live board)Not benchmarked
Terminal-Bench 4.0Not benchmarked
MMLU-Pro (Artificial Analysis)Not benchmarked
LiveCodeBench (Artificial Analysis)Not benchmarked
IFBench (Artificial Analysis)Not benchmarked
HHEM Hallucination (Vectara)Not benchmarked
SWE-bench VerifiedNot benchmarked
Terminal-BenchNot benchmarked

Percentiles are the model's standing within each board's own population. Axes marked "not benchmarked" have no published result for this model — that is an absence of data, not a low score.

grok-4-fast-chat stands at 59.5 (raw mean 66.7) — measured on 4 of 27 axes.
standingtemplateVerify →
grok-4-fast-chat stands at 59.5 versus a cohort median of 52.2 across 147 models released within 180 days — above the peer median.
cohorttemplateVerify →

Every claim is a computed fact from the current board data, phrased by a low-temperature model call and rejected by a validation gate if any number is not in the source row. How the leaderboards work →