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
This model always redirects to the latest model in the Claude Fable family.
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.
Guides, cookbooks, and tools for building with Anthropic: Claude Fable Latest on OpenRouter.
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 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 Latest has a 1,000,000 token context window. It supports up to 128,000 completion tokens.
Yes. Claude Fable Latest accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.
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.
