# clm_401EEE0A2EA0

subject: Anthropic (/record/anthropic.md)  
predicate: released  
value: Claude Fable 5.1  
valid_from: 2026-09-01  
valid_to: null  
published: 2026-06-09  
recorded: 2026-10-31  
confidence: 0.70  
status: valid  
assertable: true  
superseded_by: null  
last_updated: 2026-10-31  
checked: 2026-10-31 · its source page states the value and the date  

> September 1, 2026 We’ve launched Claude Fable 5.1 ( claude-fable-5-1 ), the successor to Claude Fable 5 for long-running agentic coding, knowledge work, and research

What https://platform.claude.com/docs/en/release-notes/overview#2026-09-01 says, word for word.

## Sources

- https://www.aboutamazon.com/news/aws/claude-fable-5-anthropic-available-amazon-bedrock (secondary, Amazon, published 2026-06-09)
- https://platform.claude.com/docs/en/release-notes/overview#2026-09-01 (primary, Anthropic, published 2026-09-01)

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