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GPT-5.5 vs Grok 4
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Scores
Intelligence (ECI)159147
Coding8915
Math9722
Reasoning & Knowledge9148
Agentic & Tools9516
Specifications
DeveloperOpenAIxAI
FamilyGPTGrok
ReleasedApr 23, 2026Jul 9, 2025
Parameters—3T
AvailabilityAPI accessAPI access
Context window1.1M—
Price — $/M input$5.00—
Price — $/M output$30.00—
Inputsfile, image, text—
Outputstext—
Benchmarks
AIME 2024/2025100%84%
APEX38%15%
ARC-AGI95%67%
ARC-AGI-285%16%
FrontierMath52%20%
FrontierMath Tier 435%2%
GPQA Diamond94%87%
GSO (code optimization)40%—
SimpleBench69%61%
SimpleQA Verified63%48%
SWE-bench Verified81%—
Terminal-Bench85%27%
WebDev Arena1505—
WeirdML85%46%
GDPval (win/tie rate)—24%
METR task horizon—1.8 h
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.