{"slug": "elevated-errors-for-claude-mythos-5-1-and-claude-fable-5-1", "title": "Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1", "summary": "Anthropic resolved elevated error rates on requests to Claude Mythos 5.1 and Claude Fable 5.1, with impact lasting from 13:57 to 14:20 UTC on September 11, according to the company's status updates. Anthropic identified the cause at 14:21 UTC, deployed a fix at 14:28 UTC, and confirmed resolution at 14:37 UTC.", "body_md": "Sep `11`, `14:37` UTC\n\n **Resolved** - The issue affecting Claude services has been resolved. Impact occurred from 13:57 to 14:20 UTC \n\n Sep `11`, `14:28` UTC\n\n **Update** - A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery. \n\n Sep `11`, `14:28` UTC\n\n **Monitoring** - A fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring for recovery. \n\n Sep `11`, `14:21` UTC\n\n **Identified** - We have identified the cause of elevated errors on requests to Claude Mythos 5.1 and Claude Fable 5.1 and are working on a fix. We will provide an update as soon as possible. \n\n Sep `11`, `14:19` UTC\n\n **Investigating** - We are investigating elevated errors on requests to Claude Fable 5.1 and Claude Mythos 5.1. We will provide an update as soon as possible.", "url": "https://wpnews.pro/news/elevated-errors-for-claude-mythos-5-1-and-claude-fable-5-1", "canonical_source": "https://status.claude.com/incidents/t33dncr5ydvl", "published_at": "2026-09-11 14:37:11+00:00", "updated_at": "2026-09-11 14:44:49.770190+00:00", "lang": "en", "topics": ["ai-products", "ai-infrastructure"], "entities": ["Anthropic", "Claude Mythos 5.1", "Claude Fable 5.1"], "alternates": {"html": "https://wpnews.pro/news/elevated-errors-for-claude-mythos-5-1-and-claude-fable-5-1", "markdown": "https://wpnews.pro/news/elevated-errors-for-claude-mythos-5-1-and-claude-fable-5-1.md", "text": "https://wpnews.pro/news/elevated-errors-for-claude-mythos-5-1-and-claude-fable-5-1.txt", "jsonld": "https://wpnews.pro/news/elevated-errors-for-claude-mythos-5-1-and-claude-fable-5-1.jsonld"}}