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 code generation, and finance and analysis tasks in particular. It also tends to be more concise than Fable 5 in its plans and summaries. We recommend testing it as a direct upgrade wherever you use Fable 5 today, and alongside Opus 5 on reasoning-heavy tasks.
- Organization
- Anthropic
- Family
- claude-fable
- Providers
- 30
- Context
- 1,000,000
- Output limit
- 128,000
- Knowledge
- 2026-06
- Release
- 2026-09-01
- Updated
- 2026-09-01
- Weights
- Closed
- Input
- text, image, pdf
- Output
- text
- Capabilities
- Tools, Reasoning
Providers
Compare every cataloged offer for this model, including its provider, route, token limits, price, and capabilities.
| Provider | Model ID | Context | Output | Input / output · 1M | Reasoning | Tools | Structured | Details |
|---|---|---|---|---|---|---|---|---|
| 302.AI | claude-fable-5-1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | — | View |
| AIHubMix | claude-fable-5-1 | 1,000,000 | 128,000 | $11.00 / $55.00 | Yes | Yes | Yes | View |
| Amazon Bedrock | global.anthropic.claude-fable-5-1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | — | View |
| Amazon Bedrock | us.anthropic.claude-fable-5-1 | 1,000,000 | 128,000 | $11.00 / $55.00 | Yes | Yes | — | View |
| Amazon Bedrock | anthropic.claude-fable-5-1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | — | View |
| Anthropic | claude-fable-5-1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | Yes | View |
| Azure | claude-fable-5-1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | Yes | View |
| Azure Cognitive Services | claude-fable-5-1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | Yes | View |
| Cloudflare AI Gateway | anthropic/claude-fable-5.1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | Yes | View |
| CrossModel | anthropic/claude-fable-5-1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | — | View |
| DevPass (LLM Gateway) | claude-fable-5-1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | — | View |
| DigitalOcean | anthropic-claude-fable-5.1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | — | View |
| Eden AI | anthropic/claude-fable-5-1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | Yes | View |
| Eden AI | anthropic/claude-fable-latest | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | Yes | View |
| GitHub Copilot | claude-fable-5.1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | — | View |
| GitLab Duo | duo-chat-fable-5-1 | 1,000,000 | 128,000 | $0.00 / $0.00 | Yes | Yes | — | View |
| Kilo Gateway | anthropic/claude-fable-5.1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | Yes | View |
| LLM Gateway | aws-bedrock/claude-fable-5-1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | No | View |
| LLM Gateway | azure-anthropic/claude-fable-5-1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | Yes | View |
| LLM Gateway | anthropic/claude-fable-5-1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | Yes | View |
| Merge Gateway | anthropic/claude-fable-5-1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | Yes | View |
| NanoGPT | anthropic/claude-fable-5.1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | Yes | View |
| Neon | claude-fable-5-1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | No | View |
| Ofox | anthropic/claude-fable-5.1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | — | View |
| OpenCode Zen | claude-fable-5-1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | — | View |
| Amazon Bedrockvia OpenRouter | anthropic/claude-fable-5.1 unknown | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | No | View |
| Anthropicvia OpenRouter | anthropic/claude-fable-5.1 unknown | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | Yes | View |
| Azurevia OpenRouter | anthropic/claude-fable-5.1 unknown | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | Yes | View |
| Googlevia OpenRouter | anthropic/claude-fable-5.1 unknown | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | Yes | View |
| Opper | claude-fable-5-1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | Yes | View |
| Requesty | claude-fable-5.1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | Yes | View |
| Requesty | claude-fable-5.1@eu | 1,000,000 | 128,000 | $11.00 / $55.00 | Yes | Yes | Yes | View |
| Tempr Gateway | anthropic/claude-fable-5-1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | Yes | View |
| Venice AI | claude-fable-5-1 | 1,000,000 | 128,000 | $12.00 / $60.00 | Yes | Yes | Yes | View |
| Vercel AI Gateway | anthropic/claude-fable-5.1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | — | View |
| Vertex | claude-fable-5-1@default | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | Yes | View |
| Vertex (Anthropic) | claude-fable-5-1@default | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | Yes | View |
| Vivgrid | claude-fable-5-1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | Yes | View |
| ZenMux | anthropic/claude-fable-5.1 | 1,000,000 | 128,000 | $10.00 / $50.00 | Yes | Yes | — | View |
Prices and limits apply to each offer. A dash means the value is not provided. OpenRouter offers show the hosting provider and routing channel separately.
Pricing
Compare token rates and cache charges across available routes and hosting configurations.
Lowest listed input and output prices across the offers above; they may belong to different providers. These are base rates, before conditional pricing, discounts or additional fees.
anthropic/claude-fable-5.1Observed - Input
- $10.00
- Output
- $50.00
- Cache read
- $0.25
- Cache write
- $12.50
- Cache write · 1 hour
- $20.00
Additional fees and pricing conditions
- web search
- $0.01 / search
Hosting prices through OpenRouter All endpoints and cache rates
| Endpoint | Input / 1M | Output / 1M | Cache read / 1M | Cache write / 1M |
|---|---|---|---|---|
| Amazon Bedrockamazon-bedrock | $10.00 | $50.00 | $0.25 | $12.50 |
| Anthropicanthropic | $10.00 | $50.00 | $0.25 | $12.50 |
| Azureazure | $10.00 | $50.00 | $0.25 | $12.50 |
| Googlegoogle-vertex/global | $10.00 | $50.00 | $0.25 | $12.50 |
Each row is a hosting configuration. Open an offer in Providers for its full pricing conditions and additional fees. Endpoint observations may differ from the routing catalog's base price.
Performance
Review reported latency and output-throughput percentiles from the latest observed rolling window.
Time to first token · milliseconds
All latency percentiles 4 endpoints
| Endpoint | P50 | P75 | P90 | P99 |
|---|---|---|---|---|
| Amazon Bedrockamazon-bedrock | 4,473 ms | 6,320.5 ms | 7,181.6 ms | 13,597.06 ms |
| Anthropicanthropic | 3,543 ms | 5,472 ms | 6,763.8 ms | 15,936.24 ms |
| Azureazure | 14,300 ms | 14,406 ms | 14,645.4 ms | 14,789.04 ms |
| Googlegoogle-vertex/global | 1,312 ms | 4,295 ms | 6,079.2 ms | 11,833.28 ms |
Output throughput · tokens per second
All throughput percentiles 4 endpoints
| Endpoint | P50 | P75 | P90 | P99 |
|---|---|---|---|---|
| Amazon Bedrockamazon-bedrock | 44 t/s | 53 t/s | 64 t/s | 80.2 t/s |
| Anthropicanthropic | 50 t/s | 63 t/s | 78 t/s | 99.95 t/s |
| Azureazure | 46 t/s | 47 t/s | 50.6 t/s | 52.76 t/s |
| Googlegoogle-vertex/global | 53 t/s | 62 t/s | 67 t/s | 86.02 t/s |
Percentiles describe the observed request distribution. These are snapshots of a rolling window, not a historical time series.
Uptime
Compare successful request rates across the latest 5-minute, 30-minute, and 24-hour observations.
Reported by OpenRouter at the time of collection; rate-limited requests are excluded. A dash means no measurement was reported. This is not a live availability check.
Benchmarks
Review attributed evaluation results on each source's original scale.
anthropic/claude-fable-5.1Observed | Design Arena | Category | Elo | Win rate | Rank |
|---|---|---|---|---|
| agents | fullstack | 1,325 | 57.2% | 1 |
| agents | godotgamedev | 1,327 | 60.7% | 1 |
| agents | mobileapps | 1,261 | 55.5% | 4 |
| agents | python-pptxslides | 1,328 | 62.6% | 1 |
| agents | webapps | 1,310 | 56.1% | 1 |
| models | 3d | 1,409 | 67.8% | 3 |
| models | asciiart | 1,333 | 65% | 3 |
| models | codecategories | 1,342 | 59.3% | 4 |
| models | dataviz | 1,352 | 61.8% | 4 |
| models | gamedev | 1,394 | 65.6% | 2 |
| models | svg | 1,307 | 57.1% | 4 |
| models | uicomponent | 1,345 | 59.6% | 7 |
| models | website | 1,320 | 56.3% | 4 |
Sources: Artificial Analysis and Design Arena, via OpenRouter. Scores retain their original scales and are not OpenAI Suite ratings.
Detailed evaluations
| Evaluation | Configuration | Source | Results | Details |
|---|---|---|---|---|
| gpqa diamond | Anthropic: Claude Fable 5.1anthropic/claude-fable-5.1-20260831 | OpenRouter | 89.933% | Details |
| models · codecategories | Claude Fable 5.1anthropic/claude-fable-5.1-20260831 | Design Arena | 1,342 Elo | Details |
| Composite indices | Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback)anthropic/claude-fable-5.1-20260831 | Artificial Analysis | Intelligence 53.4 · Coding 81.6 · Agentic 57.9 | Details |
| models · asciiart | Claude Fable 5.1anthropic/claude-fable-5.1-20260831 | Design Arena | 1,333 Elo | Details |
| models · gamedev | Claude Fable 5.1anthropic/claude-fable-5.1-20260831 | Design Arena | 1,394 Elo | Details |
| models · svg | Claude Fable 5.1anthropic/claude-fable-5.1-20260831 | Design Arena | 1,307 Elo | Details |
| models · uicomponent | Claude Fable 5.1anthropic/claude-fable-5.1-20260831 | Design Arena | 1,345 Elo | Details |
| tau bench verified airline | Anthropic: Claude Fable 5.1anthropic/claude-fable-5.1-20260831 | OpenRouter | 79.167% | Details |
| models · 3d | Claude Fable 5.1anthropic/claude-fable-5.1-20260831 | Design Arena | 1,409 Elo | Details |
| models · dataviz | Claude Fable 5.1anthropic/claude-fable-5.1-20260831 | Design Arena | 1,352 Elo | Details |
| models · website | Claude Fable 5.1anthropic/claude-fable-5.1-20260831 | Design Arena | 1,320 Elo | Details |
Sources: Artificial Analysis, Design Arena and OpenRouter. Evaluation configurations and scales differ; results are not interchangeable. Updated Oct 4, 2026.
Apps & session costs
Compare observed median session costs for applications using this model, grouped by conversation length.
| Application | Model route | Turns | Median cost / session | Details |
|---|---|---|---|---|
| Claude Code | anthropic/claude-fable-5.1-20260831 | 2–9 turns | $0.882781 | Details |
| Hermes Agent | anthropic/claude-fable-5.1-20260831 | 50+ turns | $18.670172 | Details |
| Hermes Agent | anthropic/claude-fable-5.1-20260831 | 1 turn | $0.007214 | Details |
| Claude Code | anthropic/claude-fable-5.1-20260831 | 10–49 turns | $2.611755 | Details |
| Hermes Agent | anthropic/claude-fable-5.1-20260831 | 2–9 turns | $0.515888 | Details |
| Hermes Agent | anthropic/claude-fable-5.1-20260831 | 10–49 turns | $3.523591 | Details |
| Claude Code | anthropic/claude-fable-5.1-20260831 | 50+ turns | $21.40571 | Details |
| Claude Code | anthropic/claude-fable-5.1-20260831 | 1 turn | $0.334559 | Details |
Source: OpenRouter, as of Oct 2, 2026. Published under CC BY 4.0. These are observed costs per session, not token prices or a forecast for your workload. Apps are compared separately.
Activity
Daily prompt and completion tokens reported for this model's routes in OpenRouter's top 50. Missing days have no published value.
67,837,314,055 tokens
74,829,968,678 tokens
70,704,483,461 tokens
40,127,893,080 tokens
41,196,636,949 tokens
45,809,813,103 tokens
55,412,654,953 tokens
53,377,229,975 tokens
61,445,647,589 tokens
61,154,457,835 tokens
48,637,635,954 tokens
55,872,948,637 tokens
72,604,668,609 tokens
70,249,790,343 tokens
73,132,223,593 tokens
78,111,886,659 tokens
70,916,765,820 tokens
64,655,055,740 tokens
57,241,636,095 tokens
78,352,038,278 tokens
77,505,875,010 tokens
54,976,508,979 tokens
107,077,593,879 tokens
168,902,357,616 tokens
81,895,060,158 tokens
49,180,620,194 tokens
76,570,758,975 tokens
71,299,644,588 tokens
66,781,829,482 tokens
63,623,655,477 tokens
Daily observations · 30 days
| Date (UTC) | Reported tokens | Reported routes |
|---|---|---|
| Oct 1, 2026 | 63,623,655,477 | 1 |
| Sep 30, 2026 | 66,781,829,482 | 1 |
| Sep 29, 2026 | 71,299,644,588 | 1 |
| Sep 28, 2026 | 76,570,758,975 | 1 |
| Sep 27, 2026 | 49,180,620,194 | 1 |
| Sep 26, 2026 | 81,895,060,158 | 1 |
| Sep 25, 2026 | 168,902,357,616 | 1 |
| Sep 24, 2026 | 107,077,593,879 | 1 |
| Sep 23, 2026 | 54,976,508,979 | 1 |
| Sep 22, 2026 | 77,505,875,010 | 1 |
| Sep 21, 2026 | 78,352,038,278 | 1 |
| Sep 20, 2026 | 57,241,636,095 | 1 |
| Sep 19, 2026 | 64,655,055,740 | 1 |
| Sep 18, 2026 | 70,916,765,820 | 1 |
| Sep 17, 2026 | 78,111,886,659 | 1 |
| Sep 16, 2026 | 73,132,223,593 | 1 |
| Sep 15, 2026 | 70,249,790,343 | 1 |
| Sep 14, 2026 | 72,604,668,609 | 1 |
| Sep 13, 2026 | 55,872,948,637 | 1 |
| Sep 12, 2026 | 48,637,635,954 | 1 |
| Sep 11, 2026 | 61,154,457,835 | 1 |
| Sep 10, 2026 | 61,445,647,589 | 1 |
| Sep 9, 2026 | 53,377,229,975 | 1 |
| Sep 8, 2026 | 55,412,654,953 | 1 |
| Sep 7, 2026 | 45,809,813,103 | 1 |
| Sep 6, 2026 | 41,196,636,949 | 1 |
| Sep 5, 2026 | 40,127,893,080 | 1 |
| Sep 4, 2026 | 70,704,483,461 | 1 |
| Sep 3, 2026 | 74,829,968,678 | 1 |
| Sep 2, 2026 | 67,837,314,055 | 1 |
Source: OpenRouter (openrouter.ai/rankings), as of Oct 4, 2026. CC BY 4.0. Totals include only individually published routes. Tokenizers differ by provider; the aggregated “other” category is never assigned to a model.
Technical details & API
Explore specifications, supported parameters, reasoning controls, and API identifiers for each OpenRouter route.
anthropic/claude-fable-5.1Observed - Context
- 1,000,000
- Maximum output
- 128,000
- Tokenizer
- Claude
- Input
- text, image, file
- Output
- text
- Moderation
- Yes
- Added to OpenRouter
- 2026-09-01
https://openrouter.ai/api/v1anthropic/claude-fable-5.1anthropic/claude-fable-5.1-20260831Reasoning
- Required
- Yes
- Enabled by default
- Not reported
- Default effort
- high
- Supported efforts
- max, xhigh, high, medium, low
Supported parameters
include_reasoningmax_completion_tokensmax_tokensreasoningreasoning_effortresponse_formatstopstructured_outputstool_choicetoolsverbosity
Frequently asked questions
Answers based on the model metadata and serving offers currently in the catalog.
How much does Claude Fable 5.1 cost?
Listed rates start at $0.00 per million input tokens and $0.00 per million output tokens. Prices vary by provider and configuration; see Pricing for details.
Which providers offer Claude Fable 5.1?
There are 39 cataloged offers across 30 providers. Compare model IDs, prices and limits in Providers.
What is the context window?
The cataloged model context is 1,000,000 tokens. Each serving endpoint may apply a different limit.
Does it support tools and structured output?
Tool calling: Yes. Structured output: Not reported. Support can vary by endpoint.
Catalog history · 2 recorded revisions
Metadata observations since this model was first cataloged. These are not model release versions.
- ·
4c2ede36ea1e - ·
180bf8b72ddc