Claude Fable 5.1

anthropic/claude-fable-5-1

Anthropic general-availability model for long-running coding, knowledge work, and scientific research.

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Context window: 1M
Input: Image · Text
Output: Text
Released: 2026-09-01

Max output: 128K
Knowledge cutoff: 2026-06
Weights: Closed
Capabilities: Attachments, Reasoning, Tool call

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Performance

Overall capability

71.1/100

Coding: 72.2
Reasoning: 70.8
Professional work: 67.4
Knowledge & language: 66.4


Arena Agent Overall	Professional work	LMArena	2026-11-08
MLCR-AA（Artificial Analysis）Claude Fable 5.1 (Low, Default Fallback)	Knowledge & language	Artificial Analysis	2026-11-05
CyberBench Patch v1.1	Coding	Vals AI	2026-11-05
ProgramBench	Coding	Vals AI	2026-11-05
AutomationBench-AAClaude Fable 5.1 (Max, Default Fallback)	Professional work	Artificial Analysis	2026-11-05
Finance Agent	Professional work	Vals AI	2026-11-05
Vibe Code Bench 1–100	Coding	Vals AI	2026-11-05
Humanity’s Last ExamClaude Fable 5.1 (Max, Default Fallback)	Reasoning	Artificial Analysis	2026-11-05

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ModelRegistry · Catalog updated 2026-11-10