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By using Claude Fable 5.1, you consent to data retention for purposes of monitoring safe and compliant use of AI. Anthropic's data retention policy does not allow zero data retention. Learn moreOpens in new tab

Amazon Bedrock endpoint is BYOK-only while we work on enabling public access.

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Anthropic: Claude Fable 5.1

anthropic/claude-fable-5.1

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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.

Modalities

In / Out Price

$10 / $50per 1M

Context

1.0M

Released

Sep 1, 2026

Compare
BenchmarksProvidersPricingPerformanceUptimeAppsActivityFAQExplore

Benchmarks

Scores on standardized evaluations and this model’s own outputs on shared benchmark prompts. Higher percentages are better — and each rank shows where this model lands among the models evaluated on that source.

Benchmark score summary for Anthropic: Claude Fable 5.1 (Artificial Analysis and Design Arena)
SourceBenchmarkScore
Artificial AnalysisClaude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) Intelligence Index53.4
Artificial AnalysisClaude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) Coding Index81.6
Artificial AnalysisClaude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) Agentic Index57.9
Artificial AnalysisClaude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) GPQA Diamond93.7%
Artificial AnalysisClaude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) HLE59.1%
Artificial AnalysisClaude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) AA-LCR85.3%
Artificial AnalysisClaude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) GDPval-AA61.7%
Artificial AnalysisClaude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) CritPt29.7%
Artificial AnalysisClaude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) SciCode63.1%
Artificial AnalysisClaude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) AA-Omniscience Accuracy67.2%
Artificial AnalysisClaude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) AA-Omniscience Non-Hallucination Rate27.4%
Design ArenaClaude Fable 5.1 Agents Arena Full Stack Elo1336
Design ArenaClaude Fable 5.1 Agents Arena Python-Pptxslides Elo1328
Design ArenaClaude Fable 5.1 Agents Arena Webapps Elo1323
Design ArenaClaude Fable 5.1 Models Arena 3D Elo1426
Design ArenaClaude Fable 5.1 Models Arena Asciiart Elo1338
Design ArenaClaude Fable 5.1 Models Arena Code Categories Elo1345
Design ArenaClaude Fable 5.1 Models Arena Data Visualization Elo1358
Design ArenaClaude Fable 5.1 Models Arena Game Development Elo1399
Design ArenaClaude Fable 5.1 Models Arena SVG Elo1347
Design ArenaClaude Fable 5.1 Models Arena UI Component Elo1342
Design ArenaClaude Fable 5.1 Models Arena Website Elo1320

Providers

Different companies host the same model. OpenRouter routes your request to one of them based on the routing mode you pick — Balanced (price + speed), Nitro (fastest), Floor (cheapest), or Exacto (highest tool-calling accuracy).

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Activity

Token volume and request traffic to this model over time.

Quick Start

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

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Throughput

59tok/s

P50, best across providers

Latency

4.34s

P50, best provider

AutoExacto Benchmarks
GPQA DiamondTAU-Benchauto-routing90.0%78.4%Anthropic88.7%79.4%Google Vertex87.4%78.0%Azure88.3%76.8%
Uptime (3d)The model was reachable. Request routed to a provider.

100.00%

Availability (3d)The model returned inference from any provider. Errors and empty responses count against it.

99.91%

Availability over the last 3 days

Last 72 hours
Availability 99.91%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.87%
Without Routing
97.32%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and customization options.

1.
Favicon for https://nousresearch.com
Hermes Agent
Hermes Agent is an open-source, self-improving AI agent by Nous Research that runs persistently with memory across sessions, and builds reusable skills from experience. It comes with 40+ built-in tools, including web search, browser automation, and vision, plus scheduled automations and subagents.
301Btokens
2.
Favicon for https://claude.ai/apple-touch-icon.png
Claude Code
Claude Code is Anthropic's agentic coding tool that reads your entire codebase, plans and executes changes across files, runs tests, and iterates on failures, all from natural language prompts.
235Btokens
3.
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pi
There are many coding agents, but this one is yours.
42Btokens
4.
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omp
new
38.8Btokens
5.
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Kilo Code
Kilo Code is an open-source AI coding agent that works across VS Code, JetBrains, and CLI to help developers ship code faster with agentic workflows.
31.3Btokens

Frequently asked questions

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.

Claude Fable 5.1 costs $10.00/M input tokens and $50.00/M output tokens, with separate rates for Cache Read at $0.25/M tokens, Cache Write at $12.50/M tokens, and Cache Write (1h) at $20.00/M tokens.

Claude Fable 5.1 has a 1,000,000 token context window. It supports up to 128,000 completion tokens.

Yes. Claude Fable 5.1 accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

Claude Fable 5.1 accepts text, images, and files such as PDFs as input and returns text.

Claude Fable 5.1 is served by 4 providers on OpenRouter: Azure, Anthropic, Amazon Bedrock (BYOK Only), and Google Vertex. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing.

Claude Fable 5.1 was released on September 1, 2026.