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Claude Fable 5.1: price, performance and context
Proprietary Claude Fable 5.1 by Anthropic costs $10.00 per 1M input and $50.00 per 1M output tokens, handles up to 1M tokens in one request (≈ 3,000 pages of text) and scores 53.4 points on the AgentKernel performance index, rank 3 of 212.
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Updated Oct 09, 2026, 16:46 UTC · anthropic/claude-fable-5.1
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Key facts
- Licence
- Proprietary: no public weights, only through a provider API
- Input / 1M tokens
- $10.00
- Output / 1M tokens
- $50.00
- Context window
- 1M tokens
- Max. output
- 128K tokens
- Performance index
- 53.4 points · rank 3 of 212
- Coding index
- 81.6 points · rank 1 of 119
- Agentic index
- 57.9 points · rank 1 of 91
- Cost at your usage
- $22.50 / month
- Knowledge cutoff
- n/a
- In the catalog since
- Sep 01, 2026
- Capabilities
- Reasoning, Vision, Tool Calling, Files
Placements by task
What do you get for $10.00?
Rules of thumb from the cost calculator, base rates without caching or taxes.
| Task | Cost per task | For $10.00 |
|---|
| Chat repliesA question with a short history, a detailed answer | $0.028 | 360 |
| Email draftsBullet points in, a finished email out | $0.023 | 440 |
| Document summariesRead 10 pages, write a one-page summary | $0.058 | 170 |
| Code reviewsReview and comment on 500 lines of code | $0.105 | 95 |
| Book analysesAnalyse a 300-page book in one go | $1.10 | 9 |
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