Anthropic model product
Claude Fable 5.1
1 is Anthropic's generally available, production-safeguarded LLM for demanding reasoning and long-horizon agentic work, with text and image input, text output, tool use, multilingual and vision support, and a 1M-token context window.
Updated Sep 8, 2026. Default version: Claude Fable 5.1
LLMBoard Score98.0Claude Fable 5.1
Coverage0%5 benchmark families
Context window1MTokens
Official input price$10Anthropic API
Claude Fable 5.1 Capability Profile
This profile uses the model's current scored version. Arena ratings and prices are shown separately.
Claude Fable 5.1 Benchmark Results
Benchmark scores for Claude Fable 5.1.
Sort by
Benchmark | Score | Rank | Participants | Percentile | Evidence | Evaluated |
|---|
| BenchmarkCursorBench v3.2 | Score73.40% | Rank01 | Participants2 | Percentile100.00% | EvidenceC | Evaluated |
| BenchmarkGDPval-AA | Score1,853.00 points | Rank01 | Participants9 | Percentile100.00% | EvidenceC | Evaluated |
| BenchmarkHumanity's Last Exam | Score65.00% | Rank01 | Participants103 | Percentile100.00% | EvidenceC | Evaluated |
| BenchmarkOSWorld 2.0 | Score77.90% | Rank01 | Participants11 | Percentile100.00% | EvidenceC | Evaluated |
| BenchmarkLM Arena Agent Leaderboard | Score15.87% | Rank01 | Participants49 | Percentile100.00% | EvidenceA | Evaluated |
| BenchmarkLM Arena Agent Praise Complaint | Score42.45% | Rank01 | Participants49 | Percentile100.00% | EvidenceA | Evaluated |
| BenchmarkLM Arena Agent Task Outcome Explicit | Score22.45% | Rank01 | Participants49 | Percentile100.00% | EvidenceA | Evaluated |
| BenchmarkLM Arena Text | Score1,513.70 rating | Rank01 | Participants210 | Percentile100.00% | EvidenceA | Evaluated |
| BenchmarkLM Arena Text Factuality | Score1,507.71 rating | Rank01 | Participants121 | Percentile100.00% | EvidenceA | Evaluated |
| BenchmarkTerminal-Bench 4.0 | Score55.80% | Rank02 | Participants13 | Percentile91.67% | EvidenceC | Evaluated |
| BenchmarkTerminal-Bench-Science 0.1 | Score52.60% | Rank02 | Participants2 | Percentile0.00% | EvidenceC | Evaluated |
| BenchmarkLM Arena Webdev | Score1,762.25 rating | Rank02 | Participants97 | Percentile98.96% | EvidenceA | Evaluated |
| BenchmarkLM Arena Agent Bash Recovery Steps | Score13.11% | Rank03 | Participants49 | Percentile95.83% | EvidenceA | Evaluated |
| BenchmarkLM Arena Text Style Control | Score1,504.21 rating | Rank03 | Participants210 | Percentile99.04% | EvidenceA | Evaluated |
| BenchmarkAutomationBench | Score31.40% | Rank07 | Participants18 | Percentile64.71% | EvidenceC | Evaluated |
| BenchmarkLM Arena Agent Tool Hallucination | Score0.78% | Rank13 | Participants49 | Percentile75.00% | EvidenceA | Evaluated |
| BenchmarkLM Arena Agent Steerability | Score0.58% | Rank21 | Participants49 | Percentile58.33% | EvidenceA | Evaluated |
Claude Fable 5.1 Arena Results
Preference and agent-evaluation results for the default version.
Sort by
Arena | Category | Rank | Rating / score | Votes | Observations | Result date |
|---|
| Arenaagent | Categoryoverall | Rank01 | Rating / score0.16 | VotesN/A | Observations502.5K | Result date |
| Arenaagent praise complaint | Categoryoverall | Rank01 | Rating / score0.42 | VotesN/A | Observations680 | Result date |
| Arenaagent task outcome explicit | Categoryoverall | Rank01 | Rating / score0.22 | VotesN/A | Observations2.5K | Result date |
| Arenatext | Categorycreative writing | Rank01 | Rating / score1,508.05 | Votes608 | ObservationsN/A | Result date |
| Arenatext | Categoryenglish | Rank01 | Rating / score1,515.80 | Votes1,157 | ObservationsN/A | Result date |
| Arenatext | Categoryexclude ties | Rank01 | Rating / score1,534.83 | Votes2,152 | ObservationsN/A | Result date |
| Arenatext | Categoryhard prompts | Rank01 | Rating / score1,527.85 | Votes1,662 | ObservationsN/A | Result date |
| Arenatext | Categoryindustry entertainment and sports and media | Rank01 | Rating / score1,495.93 | Votes698 | ObservationsN/A | Result date |
| Arenatext | Categoryindustry life and physical and social science | Rank01 | Rating / score1,536.94 | Votes464 | ObservationsN/A | Result date |
| Arenatext | Categoryindustry medicine and healthcare | Rank01 | Rating / score1,518.35 | Votes195 | ObservationsN/A | Result date |
| Arenatext | Categoryindustry software and it services | Rank01 | Rating / score1,540.76 | Votes923 | ObservationsN/A | Result date |
| Arenatext | Categoryindustry writing and literature and language | Rank01 | Rating / score1,525.81 | Votes782 | ObservationsN/A | Result date |
| Arenatext | Categorylonger query | Rank01 | Rating / score1,527.07 | Votes1,170 | ObservationsN/A | Result date |
| Arenatext | Categorynon english | Rank01 | Rating / score1,506.57 | Votes1,676 | ObservationsN/A | Result date |
| Arenatext | Categoryoverall | Rank01 | Rating / score1,513.70 | Votes2,906 | ObservationsN/A | Result date |
| Arenatext | Categoryrussian | Rank01 | Rating / score1,518.08 | Votes348 | ObservationsN/A | Result date |
| Arenatext factuality | Categoryenglish | Rank01 | Rating / score1,506.84 | Votes1,157 | ObservationsN/A | Result date |
| Arenatext factuality | Categoryexclude ties | Rank01 | Rating / score1,527.14 | Votes2,099 | ObservationsN/A | Result date |
| Arenatext factuality | Categoryhard prompts | Rank01 | Rating / score1,527.78 | Votes1,642 | ObservationsN/A | Result date |
| Arenatext factuality | Categoryindustry software and it services | Rank01 | Rating / score1,550.57 | Votes917 | ObservationsN/A | Result date |
| Arenatext factuality | Categoryindustry writing and literature and language | Rank01 | Rating / score1,508.71 | Votes748 | ObservationsN/A | Result date |
| Arenatext factuality | Categorylonger query | Rank01 | Rating / score1,518.77 | Votes1,170 | ObservationsN/A | Result date |
| Arenatext factuality | Categorynon english | Rank01 | Rating / score1,493.22 | Votes1,676 | ObservationsN/A | Result date |
| Arenatext factuality | Categoryoverall | Rank01 | Rating / score1,507.71 | Votes2,833 | ObservationsN/A | Result date |
| Arenatext style control | Categoryindustry software and it services | Rank01 | Rating / score1,542.65 | Votes923 | ObservationsN/A | Result date |
| Arenatext | Categoryhard prompts english | Rank02 | Rating / score1,525.56 | Votes659 | ObservationsN/A | Result date |
| Arenatext style control | Categoryindustry writing and literature and language | Rank02 | Rating / score1,510.35 | Votes782 | ObservationsN/A | Result date |
| Arenatext style control | Categorynon english | Rank02 | Rating / score1,494.83 | Votes1,676 | ObservationsN/A | Result date |
| Arenawebdev | Categoryoverall | Rank02 | Rating / score1,762.25 | Votes2,275 | ObservationsN/A | Result date |
| Arenawebdev | Categorywebdev | Rank02 | Rating / score1,762.25 | Votes2,275 | ObservationsN/A | Result date |
Claude Fable 5.1 Pricing
Official vendor API pricing appears first, followed by individual provider offers.
- Official API
- $10 input, $50 output per 1M
- Official provider
- Anthropic
- Lowest third-party
- From $10 input, $50 output per 1M via NanoGPT
- Tracked offerings
- 23
Sort by
Provider | Provider model ID | Region | Input / 1M | Output / 1M | Context | Updated |
|---|
| ProviderNanoGPT | Provider model IDanthropic/claude-fable-5.1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderVertex | Provider model IDclaude-fable-5-1@default | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderOpenRouter | Provider model IDanthropic/claude-fable-5.1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderVertex (Anthropic) | Provider model IDclaude-fable-5-1@default | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderCrossModel | Provider model IDanthropic/claude-fable-5-1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderAnthropic | Provider model IDclaude-fable-5-1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderAmazon Bedrock | Provider model IDanthropic.claude-fable-5-1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderLLM Gateway | Provider model IDanthropic/claude-fable-5-1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderMerge Gateway | Provider model IDanthropic/claude-fable-5-1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderAzure Cognitive Services | Provider model IDclaude-fable-5-1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderOpenCode Zen | Provider model IDclaude-fable-5-1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderRequesty | Provider model IDclaude-fable-5.1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderAzure | Provider model IDclaude-fable-5-1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderVercel AI Gateway | Provider model IDanthropic/claude-fable-5.1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderEden AI | Provider model IDanthropic/claude-fable-5-1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderDevPass (LLM Gateway) | Provider model IDclaude-fable-5-1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderKilo Gateway | Provider model IDanthropic/claude-fable-5.1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderOfox | Provider model IDanthropic/claude-fable-5.1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderCloudflare AI Gateway | Provider model IDanthropic/claude-fable-5.1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderGitHub Copilot | Provider model IDclaude-fable-5.1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderNeon | Provider model IDclaude-fable-5-1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderVivgrid | Provider model IDclaude-fable-5-1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderVenice AI | Provider model IDclaude-fable-5-1 | Regionglobal | Input / 1M$12 | Output / 1M$60 | Context1M | Updated |
Claude Fable 5.1 Runtime Performance
Provider-specific output speed and catalog latency for Claude Fable 5.1. Runtime does not affect the capability score.
Sort by
Provider | Output Speed | Catalog Latency | Max Input | Max Output | Updated |
|---|
| ProviderAnthropic | Output Speed7.67 tok/s | Catalog Latency10.64 s | Max Input1M | Max Output128K | Updated |
Output Speed is generated output tokens received per second. Catalog latency is reported separately from observed provider TTFT.
Claude Fable 5.1 Specifications
Technical details for the model's default version.
- Version
- Claude Fable 5.1
- Released
- Sep 1, 2026
- Knowledge cutoff
- Unknown
- Parameters
- N/A
- Context window
- 1M
- Max output
- 128K
- Inputs
- image, text
- Outputs
- text
- Open weights
- No
- License
- Proprietary
Claude Fable 5.1 Versions
Available versions of this model. The score column identifies the version used in the overall ranking.
Sort by
Version | Released | LLMBoard | Parameters | Context | Max output | Open weights | License |
|---|
| VersionClaude Fable 5.1 | Released | LLMBoard97.95 | ParametersN/A | Context1M | Max output128K | Open weightsNo | LicenseProprietary |
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What is Claude Fable 5.1?
Key information about Claude Fable 5.1 and its available data.
1, available on the Claude API as `claude-fable-5-1`. It supports adaptive thinking and a maximum output of 128K tokens on the synchronous Messages API, with text and image input and text output.
Data as of 2026-09-08.
FAQ
Common questions about Claude Fable 5.1.
When was Claude Fable 5.1 released?
Claude Fable 5.1's default version was released on Sep 1, 2026.
How much does Claude Fable 5.1 cost?
Claude Fable 5.1's official API price is $10 per million input tokens and $50 per million output tokens via Anthropic. The lowest tracked third-party offer starts at $10 input and $50 output via NanoGPT.
Who created Claude Fable 5.1?
Claude Fable 5.1 was created by Anthropic.
What is the context window for Claude Fable 5.1?
The default version has a 1M token context window.
Is Claude Fable 5.1 open weight?
No. The default version is not marked as having publicly available weights.