Model launch1 Sep 2026 00:00 UTC · 28d ago

Anthropic releases Claude Fable 5.1

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...

Type: MODEL_LAUNCH
Detection: benchmark
Confidence: high
Status

Related entities

ModelClaude Fable 5.1 CompanyAnthropic

Primary source

Epoch AI Benchmarking Hub · epoch.ai/benchmarks/eci ↗

Independent benchmark runs (GPQA Diamond, SWE-bench Verified, FrontierMath, ...) plus externally reported leaderboards and the Epoch Capabilities Index (ECI).

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