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Claude Opus 4.8 vs GPT-5.5
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Scores
Intelligence (ECI)157159
Coding9689
Math9197
Reasoning & Knowledge7691
Agentic & Tools9495
Specifications
DeveloperAnthropicOpenAI
FamilyClaudeGPT
ReleasedMay 28, 2026Apr 23, 2026
Parameters——
AvailabilityAPI accessAPI access
Context window1M1.1M
Price — $/M input$5.00$5.00
Price — $/M output$25.00$30.00
Inputstext, image, filefile, image, text
Outputstexttext
Benchmarks
AIME 2024/202598%100%
APEX43%38%
ARC-AGI93%95%
ARC-AGI-272%85%
FrontierMath47%52%
FrontierMath Tier 431%35%
GPQA Diamond91%94%
SimpleBench65%69%
SimpleQA Verified40%63%
WebDev Arena15521505
WeirdML83%85%
GSO (code optimization)—40%
SWE-bench Verified—81%
Terminal-Bench—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.