Anthropic: Claude Fable 5

proprietary

Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding.

Intelligence
Reasoning
Context
1M
Max output
128K
Input price
$10/1M tokens
Output price
$50/1M tokens

Capabilities

Reasoning & Interaction
Reasoning
Tool Calling
Output Control
Structured Output
JSON Mode
Infrastructure
Streaming
Batch Processing

Details

Model IDanthropic/claude-fable-5
Provider OpenRouter
Creator Anthropic
Familyclaude-fable
Licenseproprietary
Statusactive
Typechat
Input modalitiestext, image
Output modalitiestext
Open weightNo
Parameters—
Architecture—
Context window1M tokens
Max input—
Max output128K tokens
Reasoning tokens—
Knowledge cutoff
Training data cutoff
Release date
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs

Pricing

Input
$10
Output
$50
Cache write
—
Cache read
$1
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

Anthropic: Claude Fable 5

anthropic/claude-fable-5

Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding.

Changes · 3 entries
anthropic/claude-fable-5createca7a400Nov 2, 2026, 03:02 AM
anthropic/claude-fable-5updateab879c8Jun 18, 2026, 08:32 AM
familyclaude→claude-fable
anthropic/claude-fable-5created68a4f1Jun 10, 2026, 02:10 AM