Anthropic · released Sep 1, 2026
Claude Fable 5.1
Claude Fable 5.1 reads long documents better than any other model and stays strong at most jobs.
Our pick for long documents8 weeks oldThinks before answering
- Input price
- $10 / M
- Output price
- $50 / M
- Context
- 1M tokens
- Longest reply
- 128K
- Reads
- text, image, pdf
- Knows up to
- 2026-06
Where it shines
- It tops the document arena at 1513.
- It scores 1533 on medical questions, close to Argon.
- It holds a million tokens of context.
Where it struggles
- It costs $10 in, $50 out, more than twice Opus 5.5.
Where you can use it
- Anthropic APIAPI$10 in / $50 out per million tokens.
- OpenRouterAPIListed as
anthropic/claude-fable-5.1
How it scores on each job
Scores run 0 to 100 and blend every measure we have for that job. The number after the dot is its rank among the 33 models in the lineup.
The evidence
| Measure | Score | Rank in lineup | Source |
|---|---|---|---|
| Epoch Capabilities Index | 166 | #4 | Epoch AI |
| LMArena text | 1513 | #3 | LMArena |
| LMArena hard prompts | 1528 | #3 | LMArena |
| LMArena instruction following | 1519 | #3 | LMArena |
| LMArena multi-turn | 1495 | #5 | LMArena |
| LMArena creative writing | 1510 | #3 | LMArena |
| LMArena writing & language | 1512 | #3 | LMArena |
| LMArena coding | 1531 | #4 | LMArena |
| LMArena math | 1532 | #2 | LMArena |
| LMArena business & finance | 1492 | #3 | LMArena |
| LMArena legal & government | 1512 | #3 | LMArena |
| LMArena medicine | 1533 | #2 | LMArena |
| WebDev Arena | 1745 | #5 | LMArena |
| Vision Arena | 1319 | #2 | LMArena |
| Search Arena | 1246 | #3 | LMArena |
| Document Arena | 1513 | #1 | LMArena |
| Agent Arena | #4 | #4 | LMArena |
| Humanity's Last Exam | 47% | #2 | Epoch AI |
| FrontierMath | 90% | #5 | Epoch AI |
| SimpleQA Verified | 71% | #6 | Epoch AI |
| ARC-AGI-2 | 90% | #5 | Epoch AI |
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