Claude Fable 5.1

Claude Fable 5.1

Developer	Anthropic
Release date	September 1, 2026
Family	Claude
Generation	Claude 5.1
Level
Context window	1M tokens
Max output	128K tokens
Input	Text, image, file
Output	Text
Knowledge cutoff	2026-06
Weights	Closed
Predecessor	Claude Fable 5
Successor	Claude Fable 5.2
Website	anthropic.com
Links	Model card Docs

Part of a series on

input: $10.00
cached: $0.25
output: $50.00
cache write: $12.50
Context: 1Mtokens
Released: 2mo ago

Specifications

Model

Developer: Anthropic
Family: Claude Claude 5.1
Type: Language model
Released: September 1, 2026
Model ID: anthropic/claude-fable-5.1

Capabilities

Input → output: Text, image, file → Text
Max output: 128K tokens
Tokenizer: Claude
Knowledge cutoff: 2026-06

Weights

Openness: Closed

Sources:models.devOpenRouter

Metadata synced Nov 3, 2026, 11:17 PM UTC

To give you the best experience, we use cookies for personalization, insights, and performance. Learn more.