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 Oct 23, 2026. Default version: Claude Fable 5.1
LLMBoard Score91.8Claude Fable 5.1
Coverage40%6 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 | Participants17 | Percentile100.00% | EvidenceC | Evaluated |
| BenchmarkHumanity's Last Exam | Score65.00% | Rank01 | Participants109 | Percentile100.00% | EvidenceC | Evaluated |
| BenchmarkLM Arena Agent Steerability | Score14.80% | Rank01 | Participants44 | Percentile100.00% | EvidenceA | Evaluated |
| BenchmarkLM Arena Agent Task Outcome Explicit | Score14.93% | Rank01 | Participants44 | Percentile100.00% | EvidenceA | Evaluated |
| BenchmarkAA Omniscience Accuracy | Score67.23% | Rank01 | Participants201 | Percentile100.00% | EvidenceB | EvaluatedN/A |
| BenchmarkAA HLE Text No Tools | Score59.13% | Rank01 | Participants200 | Percentile100.00% | EvidenceB | EvaluatedN/A |
| BenchmarkAA SciCode Subtasks | Score63.08% | Rank01 | Participants89 | Percentile100.00% | EvidenceB | EvaluatedN/A |
| BenchmarkOSWorld 2.0 | Score77.90% | Rank02 | Participants17 | Percentile93.75% | EvidenceC | Evaluated |
| BenchmarkLM Arena Agent Leaderboard | Score14.17% | Rank02 | Participants44 | Percentile97.67% | EvidenceA | Evaluated |
| BenchmarkLM Arena Agent Praise Complaint | Score28.13% | Rank02 | Participants44 | Percentile97.67% | EvidenceA | Evaluated |
| BenchmarkLM Arena Document | Score1,512.58 rating | Rank02 | Participants38 | Percentile97.30% | EvidenceA | Evaluated |
| BenchmarkAA LCR v1.1 | Score85.33% | Rank02 | Participants193 | Percentile99.48% | EvidenceB | EvaluatedN/A |
| BenchmarkLM Arena Agent Bash Recovery Steps | Score11.60% | Rank03 | Participants44 | Percentile95.35% | EvidenceA | Evaluated |
| BenchmarkLM Arena Search Style Control | Score1,233.37 rating | Rank03 | Participants33 | Percentile93.75% | EvidenceA | Evaluated |
| BenchmarkLM Arena Text | Score1,511.94 rating | Rank03 | Participants218 | Percentile99.08% | EvidenceA | Evaluated |
| BenchmarkLM Arena Text Factuality | Score1,498.08 rating | Rank03 | Participants131 | Percentile98.46% | EvidenceA | Evaluated |
| BenchmarkLM Arena Webdev | Score1,742.70 rating | Rank03 | Participants107 | Percentile98.11% | EvidenceA | Evaluated |
| BenchmarkLM Arena Document Style Control | Score1,492.83 rating | Rank04 | Participants38 | Percentile91.89% | EvidenceA | Evaluated |
| BenchmarkLM Arena Vision | Score1,319.49 rating | Rank04 | Participants113 | Percentile97.32% | EvidenceA | Evaluated |
| BenchmarkAA CritPt | Score29.71% | Rank04 | Participants200 | Percentile98.49% | EvidenceB | EvaluatedN/A |
| BenchmarkLM Arena Search | Score1,245.85 rating | Rank05 | Participants33 | Percentile87.50% | EvidenceA | Evaluated |
| BenchmarkLM Arena Text Style Control | Score1,502.58 rating | Rank05 | Participants218 | Percentile98.16% | EvidenceA | Evaluated |
| BenchmarkTerminal-Bench-Science 0.1 | Score52.60% | Rank06 | Participants7 | Percentile16.67% | EvidenceC | Evaluated |
| BenchmarkTerminal-Bench 4.0 | Score55.80% | Rank07 | Participants29 | Percentile78.57% | EvidenceC | Evaluated |
| BenchmarkLM Arena Search Factuality | Score1,221.53 rating | Rank07 | Participants33 | Percentile81.25% | EvidenceA | Evaluated |
| BenchmarkLM Arena Agent Bash Reliability | Score10.60% | Rank07 | Participants44 | Percentile86.05% | EvidenceA | Evaluated |
| BenchmarkAA GPQA Diamond | Score93.74% | Rank08 | Participants199 | Percentile96.46% | EvidenceB | EvaluatedN/A |
| BenchmarkLM Arena Agent Bash Reliability No Prereq | Score10.80% | Rank08 | Participants45 | Percentile84.09% | EvidenceA | Evaluated |
| BenchmarkLM Arena Agent Tool Hallucination | Score0.61% | Rank11 | Participants44 | Percentile76.74% | 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 steerability | Categoryoverall | Rank01 | Rating / score0.15 | VotesN/A | Observations61.5K | Result date |
| Arenaagent task outcome explicit | Categoryoverall | Rank01 | Rating / score0.15 | VotesN/A | Observations6.9K | Result date |
| Arenatext | Categoryfrench | Rank01 | Rating / score1,523.26 | Votes551 | ObservationsN/A | Result date |
| Arenatext | Categoryjapanese | Rank01 | Rating / score1,562.18 | Votes282 | ObservationsN/A | Result date |
| Arenatext | Categorypolish | Rank01 | Rating / score1,525.09 | Votes240 | ObservationsN/A | Result date |
| Arenatext style control | Categoryjapanese | Rank01 | Rating / score1,553.51 | Votes282 | ObservationsN/A | Result date |
| Arenatext style control | Categorykorean | Rank01 | Rating / score1,496.84 | Votes238 | ObservationsN/A | Result date |
| Arenatext style control | Categorypolish | Rank01 | Rating / score1,514.16 | Votes240 | ObservationsN/A | Result date |
| Arenaagent | Categoryoverall | Rank02 | Rating / score0.14 | VotesN/A | Observations2M | Result date |
| Arenaagent praise complaint | Categoryoverall | Rank02 | Rating / score0.28 | VotesN/A | Observations3K | Result date |
| Arenadocument | Categoryoverall | Rank02 | Rating / score1,512.58 | Votes1,403 | ObservationsN/A | Result date |
| Arenatext | Categorychinese | Rank02 | Rating / score1,583.86 | Votes1,198 | ObservationsN/A | Result date |
| Arenatext | Categoryindustry life and physical and social science | Rank02 | Rating / score1,532.43 | Votes2,595 | ObservationsN/A | Result date |
| Arenatext | Categoryindustry medicine and healthcare | Rank02 | Rating / score1,531.47 | Votes1,206 | ObservationsN/A | Result date |
| Arenatext | Categorykorean | Rank02 | Rating / score1,516.70 | Votes238 | ObservationsN/A | Result date |
| Arenatext | Categorynon english | Rank02 | Rating / score1,508.06 | Votes9,296 | ObservationsN/A | Result date |
| Arenatext | Categoryrussian | Rank02 | Rating / score1,519.55 | Votes2,035 | ObservationsN/A | Result date |
| Arenatext | Categoryspanish | Rank02 | Rating / score1,520.31 | Votes507 | ObservationsN/A | Result date |
| Arenatext factuality | Categoryindustry medicine and healthcare | Rank02 | Rating / score1,520.34 | Votes965 | ObservationsN/A | Result date |
| Arenatext factuality | Categorymath | Rank02 | Rating / score1,515.55 | Votes597 | ObservationsN/A | Result date |
| Arenatext style control | Categoryindustry mathematical | Rank02 | Rating / score1,532.45 | Votes878 | ObservationsN/A | Result date |
| Arenatext style control | Categoryindustry medicine and healthcare | Rank02 | Rating / score1,524.68 | Votes1,206 | ObservationsN/A | Result date |
| Arenatext style control | Categorymath | Rank02 | Rating / score1,527.42 | Votes746 | ObservationsN/A | Result date |
| Arenatext style control | Categoryspanish | Rank02 | Rating / score1,500.33 | Votes507 | ObservationsN/A | Result date |
| Arenaagent bash recovery steps | Categoryoverall | Rank03 | Rating / score0.12 | VotesN/A | Observations36K | Result date |
| Arenasearch style control | Categoryoverall | Rank03 | Rating / score1,233.37 | Votes12,782 | ObservationsN/A | Result date |
| Arenatext | Categorycreative writing | Rank03 | Rating / score1,508.78 | Votes3,551 | ObservationsN/A | Result date |
| Arenatext | Categoryexclude ties | Rank03 | Rating / score1,532.89 | Votes11,544 | ObservationsN/A | Result date |
| Arenatext | Categoryhard prompts | Rank03 | Rating / score1,528.21 | Votes9,089 | ObservationsN/A | Result date |
| Arenatext | Categoryindustry entertainment and sports and media | Rank03 | Rating / score1,496.79 | Votes3,984 | 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
- 36
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 | 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 |
| ProviderVenice AI | Provider model IDclaude-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 |
| Provider302.AI | Provider model IDclaude-fable-5-1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderOpper | Provider model IDclaude-fable-5-1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderTempr Gateway | Provider model IDanthropic/claude-fable-5-1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderZenMux | Provider model IDanthropic/claude-fable-5.1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderNEAR AI Cloud | Provider model IDanthropic/claude-fable-5-1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderAI/ML API | Provider model IDanthropic/claude-fable-5.1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | Context1M | Updated |
| ProviderPrime Inference | Provider model IDanthropic/claude-fable-5.1 | Regionglobal | Input / 1M$10 | Output / 1M$50 | 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.
No runtime data
No provider-specific speed or latency record is linked to the default version yet.
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 | LLMBoard91.77 | 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 2026-10-22.
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.