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GPT-5 vs GPT-5.5
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Scores
Intelligence (ECI)150159
Coding3989
Math7097
Reasoning & Knowledge5191
Agentic & Tools4295
Specifications
DeveloperOpenAIOpenAI
FamilyGPTGPT
ReleasedAug 7, 2025Apr 23, 2026
Parameters——
AvailabilityAPI accessAPI access
Context window400K1.1M
Price — $/M input$1.25$5.00
Price — $/M output$10.00$30.00
Inputstext, image, filefile, image, text
Outputstexttext
Benchmarks
AIME 2024/202591%100%
APEX18%38%
ARC-AGI66%95%
ARC-AGI-210%85%
FrontierMath32%52%
FrontierMath Tier 413%35%
GDPval (win/tie rate)38%—
GPQA Diamond86%94%
GSO (code optimization)7%40%
Humanity's Last Exam25%—
MATH Level 598%—
METR task horizon3.4 h—
SimpleBench57%69%
SimpleQA Verified51%63%
SWE-bench Verified74%81%
Terminal-Bench50%85%
WebDev Arena13951505
WeirdML61%85%
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.