
Claude Fable 5 on AWS (June 2026): Mythos-Class Models, Safeguards, and What Changes for Bedrock Teams
On September 1, 2026 AWS GA’d Claude Fable 5.1 — 1M-token context, 128K output, Covered Model with 30-day retention. Fable 5 (June 9) remains the prior pin; here is the fit decision, not the press release.











