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Claude Fable 5 vs GPT-5.5
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Scores
Intelligence (ECI)161159
Coding10091
Math9797
Reasoning & Knowledge9792
Agentic & Tools9787
Specifications
DeveloperAnthropicOpenAI
FamilyClaudeGPT
ReleasedJun 9, 2026Apr 23, 2026
Parameters——
AvailabilityAPI accessAPI access
Context window1M1.1M
Price — $/M input$10.00$5.00
Price — $/M output$50.00$30.00
Inputstext, image, filefile, image, text
Outputstexttext
Benchmarks
AIME 2024/2025100%100%
APEX45%38%
GPQA Diamond93%94%
Humanity's Last Exam53%44%
SciCode60%56%
SimpleBench82%69%
SimpleQA Verified68%63%
WebDev Arena16541505
WeirdML88%85%
τ²-bench99%94%
ARC-AGI—95%
ARC-AGI-2—85%
FrontierMath—52%
FrontierMath Tier 4—35%
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.