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Elevated errors for Claude Fable 5

Service disruption on Claude services

Issues reaching status.claude.com

Service disruption on Claude Code on the web and related services

Elevated errors for Claude Mythos 5, Claude Fable 5, and Claude Sonnet 5

Aug 14, 2026 Announcements How Claude’s text watermark works

Future Claude models will generate text that contains a watermark. This is a way of determining the likelihood that Claude was involved in writing the text, and we, along with several other major AI providers, are implementing this change to comply with the EU AI Act. In this article, we share answers to some of the questions we’ve received about how our chosen watermarking method works, whether it affects Claude’s outputs, and why we’re making this change.

Degraded performance for multiple models

Aug 7, 2026 Product Improving Fable 5's biology safeguards

We’re making updates to Claude Fable 5’s biology safeguards in a way that substantially reduces fallbacks.