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GPT-5.5 vs Kimi K2.5
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Scores
Intelligence (ECI)159148
Coding8946
Math9753
Reasoning & Knowledge9137
Agentic & Tools9539
Specifications
DeveloperOpenAIMoonshot
FamilyGPTKimi
ReleasedApr 23, 2026Feb 2, 2026
Parameters—1T
AvailabilityAPI accessOpen weights (unrestricted)
Context window1.1M262K
Price — $/M input$5.00$0.38
Price — $/M output$30.00$2.02
Inputsfile, image, texttext, image
Outputstexttext
Benchmarks
AIME 2024/2025100%92%
APEX38%14%
ARC-AGI95%65%
ARC-AGI-285%12%
FrontierMath52%28%
FrontierMath Tier 435%4%
GPQA Diamond94%88%
GSO (code optimization)40%—
SimpleBench69%47%
SimpleQA Verified63%34%
SWE-bench Verified81%74%
Terminal-Bench85%43%
WebDev Arena15051431
WeirdML85%46%
Humanity's Last Exam—24%
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.