Grok 4 Fast

xAIReleased 19 Sep 2025ClosedSmall / fastDate verified

Compare Announcement

143132–155Index score#79 of 229 models

1/ 8Core tests taken1 of 6 areas · plus 4 anchor tests

−11Versus the frontier at releasebest then: GPT-5Replaced by Grok 4.1 Fast

–Price per million tokensno public API price found

–Context windowtokens it reads at once

Where it sitson the frontier

o3 reached this score 5 months earlier.

Test resultsby area · tick = best by any model

Reasoning & knowledgeno evidence yet

GPQA Diamond

no result

Humanity's Last Exam

no result

Mathsno evidence yet

FrontierMath T1-3

no result

Codingevidence

SWE-bench Verified

no result

Terminal-Bench

no result

Agentsevidence

APEX-Agents

no result

Novel problemsevidence

ARC-AGI-2

Long tasksno evidence yet

METR time horizon

no result

Independent results from the Epoch AI benchmarking hub, best reasoning setting. The core tests are shown here; anchor tests also inform the score and can be shown above.

What others sayrank on each leaderboard

The Model Indexindependent tests, our method#79of 219 · 143

LMArena · Mathsmaths questions in chat#104of 373 · 1425 LMArena · Textoverall chat quality, judged by people#112of 388 · 1419 LMArena · Creative writingcreative writing#119of 386 · 1384 LMArena · Codingcoding questions in chat#125of 383 · 1458 Epoch Capabilities Indexoverall capability from many benchmarks#83of 239 · 144.2 LMArena · WebDevbuilding web apps and front ends#122of 123 · 1159

Further left is better. Leaderboards measure different things: LMArena is people voting blind between two answers, the others are test scores. Click any row for the source.