The Model Index
Models/xAI

Grok 4

xAIReleased 9 Jul 2025ClosedFlagshipDate verified
147135–158Index score#64 of 229 models
4/ 8Core tests taken4 of 6 areas · plus 14 anchor tests
FrontierVersus the frontier at releaseset or matched the recordReplaced by Grok 4.1
–Price per million tokensno public API price found
–Context windowtokens it reads at once

Where it sitson the frontier

o3 reached this score 3 months earlier.

Test resultsby area · tick = best by any model

Reasoning & knowledgeevidence
GPQA Diamond
87%
Humanity's Last Exam
no result
Mathsevidence
FrontierMath T1-3
no result
Codingevidence
SWE-bench Verified
no result
Terminal-Bench
27%
Agentsevidence
APEX-Agents
no result
Novel problemsevidence
ARC-AGI-2
16%
Long tasksevidence
METR time horizon
1.8 h

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#64of 219 · 147
Epoch Capabilities Indexoverall capability from many benchmarks#69of 239 · 146.4

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.

Best attop three among current models

Replaced by Grok 4.1; it no longer leads any category among current models.

Where this model places in the top three of today's models, on category leaderboards and on our core tests.

Where to use itprices checked 1 Oct 2026

Provider prices come from OpenRouter's live listing; going direct to a provider can differ. Subscriptions are the lab's own apps.

Facts and sources

Released9 Jul 2025
Announcementx.ai ↗
Release entryGrok 4 (+ Heavy)
Scored asGrok 4
Artificial Analysis index–
Output speed–
Hugging Faceclosed weights

xAI releasesaround this one