Claude Fable 5.1
Anthropic · 5 thinking configurations
Intelligence53.2
Input / 1M$10.00
Output / 1M$50.00
Context1M
Tariff: Anthropic · Source: artificial-analysis · USD per million tokens
Thinking configuration
What does more thinking buy you?
Compare this model’s measured thinking configurations.
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Efficient frontier: best measured score at each cost5 measured configurations · 0 without both values
Selected: thinking xhigh · Click a point to switch configuration
Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...
Intelligence IndexArtificial Analysis composite index, not a percentage. Different versions of the index are not directly comparable.
53.2 pointsGPQA DiamondGraduate-level scientific questions. Measures specialist reasoning rather than web-search quality.
93.4 %Humanity’s Last ExamDifficult questions across many disciplines, compared under the same evaluation setup.
58.7 %SciCodeCode generation for scientific research problems.
60.9 %Terminal-Bench 2.1Agent tasks in a terminal environment. Results also depend on the evaluation harness.
91.0 %Omniscience accuracyFactual accuracy in Artificial Analysis's Omniscience evaluation.
66.2 %Specifications from the catalog
Inputtext, image, file
Outputtext
Tool callingYes
Structured outputYes
Speed58.8 tok/s
First token108.02 s
Maximum output128K
Catalog listing date2026-09-01