Anthropic · releasedClaude Fable 5.1

validasserted

Valid from: 2026-09-01
Valid until: still holds
Published: 2026-06-09
Recorded by AsOf: 2026-10-31
Checked: 2026-10-31 · its source page states the value and the date
Confidence: 0.70

Sources

“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 the page says, read 2026-10-31

Claude Fable 5.1 is now available on AWSsecondary · aboutamazon.com · 2026-06-09
Claude Platform release notes, September 1, 2026primary · platform.claude.com · 2026-09-01

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