Claude Fable 5.1 (batch)

Anthropic· released 1 Sept 2026

anthropic/claude-fable-5.1:batch

Input / 1M tokens: $5
Output / 1M tokens: $25

Context window1M tokens

Longest answer: 128K tokens

reads textreads imagereads filetool callingvisionreasoning

About

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...

Details

Lab: Anthropicopenrouter.ai · 3 Oct 2026
Context: 1,000Kopenrouter.ai · 3 Oct 2026
Input price: $5 / 1Mopenrouter.ai · 3 Oct 2026
Output price: $25 / 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:batch· checked 3 Oct 2026