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...
Anthropic: Claude Fable 5.1 — Anthropic. Context window 1,000,000 tokens. API pricing (per 1M tokens): Input $10, Output $50. License: Proprietary. LMArena 1,511.
| Provider | Anthropic |
|---|---|
| API model ID | anthropic/claude-fable-5.1 |
| Tier | Frontier |
| Context window | 1,000,000 tokens |
| Max output | 128,000 tokens |
| License | Proprietary |
| API pricing (per 1M tokens) · Input | $10 |
| API pricing (per 1M tokens) · Output | $50 |
| LMArena | 1,511 (claude-fable-5.1-max) |
LMArena (CC-BY 4.0, best reasoning setting, 2026-10-02) · GPQA Diamond: Epoch AI (CC-BY 4.0)
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