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GPT-5.5 vs Kimi K2.6
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Scores
Intelligence (ECI)159151
Coding9179
Math9776
Reasoning & Knowledge9268
Agentic & Tools8787
Specifications
DeveloperOpenAIMoonshot
FamilyGPTKimi
ReleasedApr 23, 2026Apr 20, 2026
Parameters—1T
AvailabilityAPI accessOpen weights (unrestricted)
Context window1.1M262K
Price — $/M input$5.00$0.55
Price — $/M output$30.00$3.20
Inputsfile, image, texttext, image
Outputstexttext
Benchmarks
AIME 2024/2025100%96%
APEX38%—
ARC-AGI95%—
ARC-AGI-285%—
FrontierMath52%39%
FrontierMath Tier 435%15%
GPQA Diamond94%91%
GSO (code optimization)40%—
Humanity's Last Exam44%36%
SciCode56%54%
SimpleBench69%—
SimpleQA Verified63%39%
SWE-bench Verified81%77%
Terminal-Bench85%—
WebDev Arena15051526
WeirdML85%56%
τ²-bench94%96%
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.