Claude Fable 5.1
API ID claude-fable-5-1
Claude Fable 5.1 is an Anthropic model, released September 2026. It has a 1,000,000-token context window and up to 128,000 output tokens. It takes image input and supports reasoning. Standard price: $10.00 input and $50.00 output per 1M tokens.
- Status
- Active
- Released
- September 2026
- Shutdown
- not before Sep 1, 2027
- Replacement
- —
claude-fable-5-1 is active. Anthropic says it won't be retired before September 1, 2027.
Benchmarks
Scores as each source published themComparing with Claude Fable 5, the previous model in this line. A score is compared only with the same benchmark from the same source, at the same setting where both have it. Full comparison: prices, limits, features
Arena
| Arena | Claude Fable 5.1 | Claude Fable 5 | Change | Rank | Date | Source |
|---|---|---|---|---|---|---|
TextBy category
| 1501 ±6 | 1503 ±4 | −2 within range | 7 of 415 14,121 votes | Oct 13, 2026 | source |
| Text: Coding | 1535 ±12 | 1551 ±7 | −16 within range | 15 of 410 2,816 votes | Oct 13, 2026 | source |
| WebDev | 1743 ±9 | 1624 ±6 | +119 | 5 of 142 7,230 votes | Oct 13, 2026 | source |
| Vision | 1286 ±10 | 1308 ±7 | −22 | 17 of 165 4,648 votes | Oct 9, 2026 | source |
| Search | 1233 ±7 | 1229 ±7 | +4 within range | 4 of 42 12,782 votes | Oct 13, 2026 | source |
| Document | 1493 ±15 | 1499 ±8 | −6 within range | 6 of 44 1,403 votes | Sep 13, 2026 | source |
| Agent | 0.141 ±0.020 | 0.084 ±0.014 | +0.057 | 3 of 54 16,282 sessions | Oct 14, 2026 | source |
Rated as claude-fable-5.1-max (max effort); Claude Fable 5 as claude-fable-5-high (high effort). Some were rated at different settings; ratings on one arena share one scale, so the difference still reads directly. Text, WebDev, Vision, Search and Document ratings come from people voting between two anonymous answers; Text, Vision, Search and Document are style-controlled, as on arena.ai. Agent is Arena's separate score for real agent sessions, on its own scale. Data: Arena (arena.ai), CC BY 4.0.
Epoch AI
| Benchmark | Claude Fable 5.1 | Claude Fable 5 | Change | Setting | Run | Source |
|---|---|---|---|---|---|---|
| FrontierMath Tier 4 | 87.8% | 90.2% | −2.4 pts | max effort | Sep 1, 2026 | source |
| FrontierMath Tiers 1-3 | 90.2% | 87.0% | +3.2 pts | max effort | Sep 1, 2026 | source |
| OTIS Mock AIME 2024-2025 | 100.0% | 99.7% | +0.3 pts | max effort | Sep 1, 2026 | source |
| SimpleQA Verified | 70.8% | 70.7% | +0.1 pts | max effort (vs xhigh effort) | Sep 1, 2026 | source |
Run independently by Epoch AI. Data: Epoch AI, Capabilities & benchmarking (epoch.ai/benchmarks), CC BY.
On cloud platforms
All platform dates| Platform | Platform ID | State | Shutdown | Time left | Replacement | Source |
|---|---|---|---|---|---|---|
| Amazon Bedrock | anthropic.claude-fable-5-1 | Active | not before Sep 1, 2027 | — | source | |
| Microsoft Foundryversion 1 | claude-fable-5-1 | Active | Dec 5, 2027 | 416 days | — | source |
Read daily from each platform's own pages. The shutdown date and countdown on this page use Anthropic's own date. Time left counts to 00:00 UTC on the shutdown date, which is the evening before in ET.
Features
Compare models| Feature | Value | Since | Source |
|---|---|---|---|
| Prompt cachingA prompt prefix you send again and again (system prompt, documents, tools) is cached, so later requests cost less and start faster. | Supported | in place when tracking began (October 6, 2026) | source |
| Batch APISend many requests as one job that runs in the background, usually finished within 24 hours, at a lower price than live requests. | Supported | in place when tracking began (October 6, 2026) | source |
| Image inputImages such as screenshots, photos and charts can go in the prompt for the model to read. | Supported | in place when tracking began (October 6, 2026) | source |
| Reasoning / thinkingThe model can work through a problem step by step before it answers: usually better answers to hard questions, at the cost of more tokens and time. | Supported (thinking: adaptive, always on; default effort: high) | in place when tracking began (October 6, 2026) | source |
| Context windowThe most the model can work with in one request, in tokens: your prompt, conversation history and files. A token is about three-quarters of an English word. | 1,000,000 tokens | in place when tracking began (October 6, 2026) | source |
| Max output tokensThe longest reply the model can write in one response, in tokens. A token is about three-quarters of an English word. | 128,000 tokens | in place when tracking began (October 6, 2026) | source |
Not published by Anthropic: Structured outputs, Function calling, PDF input, Fine-tuning, Built-in web search, temperature parameter, top_p parameter, logprobs.
Price history
USD per 1M tokens, standard tierWe started recording this model's prices on Oct 1, 2026. The history grows with each daily check.
Show as a table
| From | Type | Price |
|---|---|---|
| Oct 1, 2026 | Input | $10.00 |
| Oct 1, 2026 | Output | $50.00 |
Prices
USD per 1M tokens, every type and band, by tier| Type | Price $/1M | In effect |
|---|---|---|
| Standard | ||
| input | $10.00 | |
| cached input | $0.25 | |
| cache write (5 min) | $12.50 | |
| cache write (1 hour) | $20.00 | |
| output | $50.00 | |
| Batch | ||
| input | $5.00 | |
| output | $25.00 | |
Changelog
Changes we detected on Anthropic's pagesNo changes recorded yet.
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Last checked · Sources: Anthropic models, Anthropic deprecations, Anthropic pricing, Anthropic model pages