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Grok 4 Fast Reasoning

xAI·Pending·Released 2025-09-19text
Context2,000k
Max output-
Input / 1M$0.2 ↗
Output / 1M$0.5 ↗
Cached in$0.05
Benchmarks12

Benchmarks

Cited public sources · rank is exact-benchmark, apples-to-apples

AIME 2025 (no tools)#6/892% ↗
BrowseComp#13/1544.9% ↗
BrowseComp (zh)51.2% ↗
GPQA Diamond#35/7085.7% ↗
HMMT 2025 (no tools)93.3% ↗
Humanity's Last Exam (no tools)#19/2920% ↗
LiveCodeBench (Jan-May)80% ↗
Reka Research Eval66% ↗
Search Arena Elo1163 ↗
SimpleQA#1/295% ↗
X Bench Deepsearch (zh)74% ↗
X Browse58% ↗

Compare

vs GPT-6 Astravs GPT-5.6 Solvs GPT-5.6 Terravs GPT-5.6 Lunavs Claude Fable 5.1vs Claude Opus 5vs Claude Sonnet 5vs Claude Haiku 4.5

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Access Grok 4 Fast Reasoning and every other model through one endpoint with automatic failover: Respan gateway.