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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

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Anthropic: Claude Fable Latest

Claude Fable 5.1

~anthropic/claude-fable-latest

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This model always redirects to the latest model in the Claude Fable family.

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API

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.

Documentation

Guides, cookbooks, and tools for building with Anthropic: Claude Fable Latest on OpenRouter.

  • Claude Fable 5.1 Migration GuideCookbook

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Claude Fable 5.1by anthropic

Top models used by Claude Fable Latest

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Frequently asked questions

This model always redirects to the latest model in the Claude Fable family.

The Claude Fable Latest documentation on OpenRouter includes the Claude Fable 5.1 Migration Guide cookbook. The quickstart covers API keys and your first request, and the API reference lists every parameter.

Claude Fable Latest has no fixed price of its own. Each request is billed at the price of the model that serves it, so your cost depends on which model the request is routed to.

Claude Fable Latest can route to models with context windows of up to 1,000,000 tokens. The context length available to a request is that of the model that serves it.

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

Claude Sonnet 5.5, Claude Opus 5.5, Claude Opus 5 and 11 more are other text models from Anthropic.

Claude Fable Latest was released on June 9, 2026.