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Claude Fable 5.1

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Anthropic's Claude Fable 5.1 is built for demanding reasoning and long-horizon agentic work. It extends Claude Fable 5 with stronger long-running agentic coding, multistep research, and document, spreadsheet, and slide work, at the same input and output prices, with cache reads 75% cheaper.
Anthropic's Claude Fable 5.1 is built for demanding reasoning and long-horizon agentic work. It extends Claude Fable 5 with stronger long-running agentic coding, multistep research, and document, spreadsheet, and slide work, at the same input and output prices, with cache reads 75% cheaper.

Not yet available on ZeroTwo. Announced by Anthropic on September 1, 2026. Coming to ZeroTwo soon. The specifications below are the provider's published figures.

Claude Fable 5.1 is an AI model from Anthropic, not yet available on ZeroTwo. It costs $10.00 per million input tokens and $50.00 per million output tokens, has a 1,000,000-token context window, can return up to 128,000 output tokens.

Price
$10.00 • $50.00
Input • Output
Input
Text, Image
Output
Text

Anthropic's Claude Fable 5.1 is built for demanding reasoning and long-horizon agentic work. It extends Claude Fable 5 with stronger long-running agentic coding, multistep research, and document, spreadsheet, and slide work, at the same input and output prices, with cache reads 75% cheaper.

1,000,000 context window
128,000 max output tokens
Pricing
Pricing is based on the number of tokens used. For tool-specific models, like search and computer use, there's a fee per tool call. See details in the pricing page.
Text tokens
Per 1M tokens
∙
Batch API price
Input
$10.00
Cached input
$0.25
Output
$50.00
Quick comparison
Input
Cached input
Output
Claude Fable 5.1
$10.00
Modalities
Text
Input and output
Image
Input only
Audio
Not supported

Questions

How much does Claude Fable 5.1 cost?

Claude Fable 5.1 is priced at $10.00 per million input tokens and $50.00 per million output tokens, with cached input at $0.25 per million. On ZeroTwo it is included in your plan's credits rather than billed per token.

What is Claude Fable 5.1's context window?

Claude Fable 5.1 accepts up to 1,000,000 tokens of context and can return up to 128,000 output tokens.

Is Claude Fable 5.1 available on ZeroTwo?

Not yet. Announced by Anthropic on September 1, 2026. Coming to ZeroTwo soon. The figures on this page are Claude Fable 5.1's published specifications from its provider. Every model ZeroTwo does serve today is listed on the models page.