Claude Fable 5.1

Anthropic· released 1 Sept 2026

anthropic/claude-fable-5.1

Input / 1M tokens: $10
Output / 1M tokens: $50

Context window1M tokens

Longest answer: 128K tokens

reads textreads imagereads filetool callingvisionreasoning

About

Claude Fable 5.1 is a text-output model from Anthropic that accepts text, images and files. It supports tools and reasoning, with a context window of 1,000,000 tokens and a maximum output of 128,000 tokens. Pricing is $10 USD per 1 million input tokens and $50 USD per 1 million output tokens. The listed release date is September 1, 2026, and its model ID is anthropic/claude-fable-5.1. The summary highlights gains in agentic coding, long-running agent workflows and knowledge work, including long code refactors and front-end and visual work. For builders, the listed modalities and large context and output limits are relevant to workflows that handle substantial inputs or generate long responses. Tool support and reasoning are also listed.

Who it is for

Claude Fable 5.1 suits teams building agentic coding and knowledge-work workflows, particularly those involving long code refactors or front-end and visual work. Its text, image and file inputs accommodate more than text-only requests.

What is good

Accepts text, image and file inputs
Supports tools and reasoning
1,000,000-token context window
Maximum output of 128,000 tokens

What to know first

Output tokens cost $50 USD per 1 million
Input tokens cost $10 USD per 1 million

Verdict

Claude Fable 5.1 pairs multimodal input with a large context window and long output capacity. Its listed per-token prices make output volume a key consideration.

Details

Lab: Anthropicopenrouter.ai · 3 Oct 2026
Context: 1,000Kopenrouter.ai · 3 Oct 2026
Input price: $10 / 1Mopenrouter.ai · 3 Oct 2026
Output price: $50 / 1Mopenrouter.ai · 3 Oct 2026
Max output: 128,000 tokensopenrouter.ai · 3 Oct 2026
Inputs: text, image, fileopenrouter.ai · 3 Oct 2026
Open weights: Noopenrouter.ai · 3 Oct 2026

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Sources

openrouter.ai/anthropic/claude-fable-5.1· checked 3 Oct 2026