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Claude Fable 5 vs Step 3.7 Flash
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Scores
Intelligence (ECI)161—
Coding10032
Math97—
Reasoning & Knowledge9735
Agentic & Tools9797
Specifications
DeveloperAnthropicStepFun
FamilyClaude—
ReleasedJun 9, 2026May 28, 2026
Parameters——
AvailabilityAPI access—
Context window1M256K
Price — $/M input$10.00$0.20
Price — $/M output$50.00$1.15
Inputstext, image, filetext, image, video
Outputstexttext
Benchmarks
AIME 2024/2025100%—
APEX45%—
GPQA Diamond93%81%
Humanity's Last Exam53%20%
SciCode60%40%
SimpleBench82%—
SimpleQA Verified68%—
WebDev Arena1654—
WeirdML88%—
τ²-bench99%99%
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.