Anthropic: Claude Fable 5.1 (batch)

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
Max output
128K
Input price
$5/1M tokens
Output price
$25/1M tokens

Capabilities

Reasoning & Interaction
Reasoning
Tool Calling
Output Control
Structured Output
JSON Mode

Details

Model IDanthropic/claude-fable-5.1:batch
Provider OpenRouter
Creator Anthropic
Familyclaude-fable
License—
Status—
Typechat
Input modalitiestext, image
Output modalitiestext
Open weight—
Parameters—
Architecture—
Context window1M tokens
Max input—
Max output128K tokens
Reasoning tokens—
Knowledge cutoff—
Release date
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs

Pricing

Input
$5
Output
$25
Cache write
—
Cache read
$0.13
Batch in
—
Batch out
—

Family Comparison: claude-fable

ModelContextMax outPricing
Anthropic: Claude Fable 5 (batch)1M128K$5$25
Anthropic: Claude Fable 5.1 (batch)1M128K$5$25
Anthropic: Claude Fable 5.11M128K$10$50
Anthropic: Claude Fable 51M128K$10$50

API

GET/v1/models/openrouter/anthropic/claude-fable-5.1:batch