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Anthropic · API model

Claude Fable 5.1

Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...

Context
1M
Input / 1M
$10
Output / 1M
$50
Released
Sep 1, 2026
View on OpenRouterFind it in the catalog
Specifications

Claude Fable 5.1 specs

Provider
Anthropic
Type
API model
Model ID
anthropic/claude-fable-5.1
Context window
1,000,000 tokens1M
Input price
$10per 1M input tokens
Output price
$50per 1M output tokens
Accepts
file, image, text
Produces
text
Released
Sep 1, 2026
Popularity
35/100position #49 in OpenRouter's weekly usage ranking
Source
OpenRouter
Overview

About Claude Fable 5.1

Claude Fable 5.1 is an API model from Anthropic, released on Sep 1, 2026, with a context window of 1,000,000 tokens, pricing of $10 per million input tokens and $50 per million output tokens. It accepts file, image, text input and produces text output.

At listed prices, a request with 10,000 input tokens and 1,000 output tokens costs about $0.15.

Specs are sourced from OpenRouter and were last checked on Nov 3, 2026. Always confirm current pricing and limits with the provider before production use.

Tool callingStructured outputsJSON modeReasoning
FAQ

Claude Fable 5.1 questions

What is the context window of Claude Fable 5.1?

Claude Fable 5.1 supports a context window of 1,000,000 tokens.

How much does Claude Fable 5.1 cost?

Claude Fable 5.1 is listed at $10 per million input tokens and $50 per million output tokens on OpenRouter.

When was Claude Fable 5.1 released?

Claude Fable 5.1 was published on Sep 1, 2026.

What inputs does Claude Fable 5.1 accept?

Claude Fable 5.1 accepts file, image, text input and produces text output.