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By using Claude Fable 5, 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

Azure, Google Vertex, and Amazon Bedrock endpoints are BYOK-only while we work on enabling public access.

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Anthropic: Claude Fable 5

anthropic/claude-fable-5

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Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding. It supports text, image, and file inputs with text output, with reasoning support and a 1M-token context window. It is suited for long-running, complex, and asynchronous tasks that previously required frequent human check-ins.

It is particularly strong at end-to-end work that would otherwise take a person hours, days, or weeks - taking on problems that are long-running, ambiguous, or highly multi-step. It executes well-scoped tasks with few mistakes, automatically self-correcting through verification loops, and ships with robust safeguards.

Modalities

In / Out Price

$10 / $50per 1M

Context

1.0M

Released

Jun 9, 2026

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ProvidersPricingPerformanceUptimeBenchmarksAppsActivityFAQExplore

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), 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.

Benchmarks

Scores on standardized evaluations. Higher percentages are better — and rank percentile shows where this model lands among all models on OpenRouter.

Benchmark score summary for Anthropic: Claude Fable 5 (Artificial Analysis and Design Arena)
SourceBenchmarkScore
Artificial AnalysisClaude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) Intelligence Index49.7
Artificial AnalysisClaude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) Coding Index76.5
Artificial AnalysisClaude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) Agentic Index51.0
Artificial AnalysisClaude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) GPQA Diamond92.6%
Artificial AnalysisClaude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) HLE55.5%
Artificial AnalysisClaude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) IFBench63.5%
Artificial AnalysisClaude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) τ²-Bench Telecom98.5%
Artificial AnalysisClaude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) AA-LCR82.3%
Artificial AnalysisClaude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) GDPval-AA56.6%
Artificial AnalysisClaude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) CritPt28.6%
Artificial AnalysisClaude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) SciCode61.0%
Artificial AnalysisClaude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) Terminal-Bench Hard62.9%
Artificial AnalysisClaude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) AA-Omniscience Accuracy65.3%
Artificial AnalysisClaude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) AA-Omniscience Non-Hallucination Rate36.4%
Design ArenaClaude Fable 5 Agents Arena Agenticgamedev Elo1285
Design ArenaClaude Fable 5 Agents Arena Agentichtmlslides Elo1254
Design ArenaClaude Fable 5 Agents Arena Agenticslides(Html) Elo1252
Design ArenaClaude Fable 5 Agents Arena Androidnative Elo1292
Design ArenaClaude Fable 5 Agents Arena Full Stack Elo1284
Design ArenaClaude Fable 5 Agents Arena Godotgamedev Elo1343
Design ArenaClaude Fable 5 Agents Arena Htmlslides Elo1280
Design ArenaClaude Fable 5 Agents Arena Mobile Apps Elo1294
Design ArenaClaude Fable 5 Agents Arena Python-Pptxslides Elo1293
Design ArenaClaude Fable 5 Agents Arena Webapps Elo1274
Design ArenaClaude Fable 5 Models Arena 3D Elo1347
Design ArenaClaude Fable 5 Models Arena Asciiart Elo1340
Design ArenaClaude Fable 5 Models Arena Code Categories Elo1325
Design ArenaClaude Fable 5 Models Arena Data Visualization Elo1324
Design ArenaClaude Fable 5 Models Arena Game Development Elo1361
Design ArenaClaude Fable 5 Models Arena SVG Elo1324
Design ArenaClaude Fable 5 Models Arena UI Component Elo1331
Design ArenaClaude Fable 5 Models Arena Website Elo1308

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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Frequently asked questions

Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding. It supports text, image, and file inputs with text output, with reasoning support and a 1M-token context window. It is suited for long-running, complex, and asynchronous tasks that previously required frequent human check-ins.

Claude Fable 5 costs $10.00/M input tokens and $50.00/M output tokens, with separate rates for Cache Read at $1.00/M tokens, Cache Write at $12.50/M tokens, Cache Write (1h) at $20.00/M tokens, and Web Search at $10.00/1K calls.

Claude Fable 5 has a 1,000,000 token context window. It supports up to 128,000 completion tokens.

Yes. Claude Fable 5 accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

Claude Fable 5 accepts text, images, and files such as PDFs as input and returns text.

Claude Fable 5 is served by 5 providers on OpenRouter: Claude Platform on AWS, Azure (BYOK Only), Amazon Bedrock, Google Vertex, and Anthropic. 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 was released on June 9, 2026.