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Text & reasoningStable
Anthropic
Claude Fable 5.1
Anthropic's frontier model for ambitious, long-running agentic and coding work, with strong vision and enterprise marketplace availability.
Plain-English overview
What Claude Fable 5.1 actually is
Claude Fable 5.1 is designed for work that can span many steps, applications, and hours. Anthropic emphasizes root-cause problem solving, recovery from tool failures, complex coding changes, and document-heavy enterprise analysis.
Its API cost sits at the premium end of this text shortlist. The more important operational distinction is retention: Fable uses a 30-day safety-monitoring window by default, with special enterprise routes for eligible customers.
Good fit for
- Long-running autonomous projects
- Large codebase changes and review
- Complex documents, diagrams, and enterprise workflows
Category comparison
The facts that matter for text models
These are provider-published specifications, not Cody benchmark scores. Follow the linked sources for current limits and endpoint-specific exceptions.
- Context windowMaximum combined prompt and working context documented by the provider.
- 1M tokens
- Maximum outputProvider-published response limit, where available.
- 128K tokens
- Input priceCurrent standard list price per million input tokens unless noted.
- $10 / 1M
- Output priceCurrent standard list price per million output tokens unless noted.
- $50 / 1M
- InputsMedia types accepted by the listed model endpoint.
- Text, image, PDF
- Tools & agentsSelected native tools and agent-building capabilities, not an exhaustive list.
- Tool use, agents, vision, coding workflows
API and provider access
Where to get Claude Fable 5.1
Availability
Regions and access stage
Available through Claude Platform, AWS, Google Cloud, Microsoft Foundry, and supported marketplaces.
Direct access depends on Anthropic's supported-country list; cloud regions and marketplace eligibility vary.
Check live availabilityData and training
The route matters.
Fable requires 30-day retention for safety monitoring by default. Anthropic says enterprise data is not used for training without explicit permission; eligible enterprises can use EFS/customer-controlled storage or temporary zero-retention arrangements.
This is a concise reading of the cited provider material, not legal advice. A third-party gateway can have different storage, routing, training, and residency terms from the model maker's direct API.
Read the provider policyFrequently asked questions
Claude Fable 5.1 FAQ
What is Claude Fable 5.1?
Anthropic's frontier model for ambitious, long-running agentic and coding work, with strong vision and enterprise marketplace availability. Claude Fable 5.1 is designed for work that can span many steps, applications, and hours. Anthropic emphasizes root-cause problem solving, recovery from tool failures, complex coding changes, and document-heavy enterprise analysis.
When was Claude Fable 5.1 released?
Claude Fable 5.1 was released on September 1, 2026 according to the cited provider materials.
Where can I access Claude Fable 5.1?
Available through Claude Platform, AWS, Google Cloud, Microsoft Foundry, and supported marketplaces. The access routes listed in this guide are Anthropic, OpenRouter, AWS, Google Cloud, Microsoft.
How much does Claude Fable 5.1 cost?
$10 input · $50 output / 1M tokens. Cache reads are $0.25 per million tokens. Anthropic lists US-only inference at 1.1× input and output pricing.
Where is Claude Fable 5.1 available?
Available through Claude Platform, AWS, Google Cloud, Microsoft Foundry, and supported marketplaces. Direct access depends on Anthropic's supported-country list; cloud regions and marketplace eligibility vary.
Is my Claude Fable 5.1 API data used for training?
Fable requires 30-day retention for safety monitoring by default. Anthropic says enterprise data is not used for training without explicit permission; eligible enterprises can use EFS/customer-controlled storage or temporary zero-retention arrangements. The policy belongs to the provider route and account terms, so verify it again before production use.
Research trail
Sources for this guide
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