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Claude Fable 5 vs Claude Fable 5.1

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Claude Fable 5Claude Fable 5.1
AttributeClaude Fable 5Anthropic · 52 in the newsClaude Fable 5.1Anthropic · 9 in the news
Scores
Intelligence (ECI)163163
Coding96100
Math9696
Reasoning & Knowledge8994
Agentic & Tools9698
Specifications
DeveloperAnthropicAnthropic
FamilyClaudeClaude
ReleasedJun 9, 2026Sep 1, 2026
Parameters
AvailabilityAPI accessAPI access
Context window1M1M
Price — $/M input$10.00$10.00
Price — $/M output$50.00$50.00
Inputstext, image, filetext, image, file
Outputstexttext
Benchmarks
AIME 2024/2025100%100%
APEX45%47%
ARC-AGI99%98%
ARC-AGI-289%90%
GPQA Diamond86%94%
Humanity's Last Exam56%47%
SciCode61%63%
SimpleBench82%
SimpleQA Verified71%71%
WebDev Arena16261765
WeirdML92%93%
τ²-bench99%

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.

Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.