{"type":"post","id":"elevated-errors-hit-claude-mythos-5-1-fable-3b66a3","slug":"elevated-errors-hit-claude-mythos-5-1-fable-3b66a3","title":"Elevated errors hit Claude Mythos 5.1, Fable 5.1, Opus 5.5, Sonnet 5.5 and Haiku 5.5 early on October 25","description":"Anthropic resolved a 30-minute period of elevated errors across Claude services on October 25, 2026.","retrieval_nugget":"Anthropic resolved a 30-minute period of elevated errors across Claude services on October 25, 2026. The incident named five Claude model families and affected the web product, API, Claude Code, and Claude Cowork, making it a practical availability event for teams whose workflows depend on any of those surfaces.","published_at":"2026-10-27","updated_at":"2026-10-27","record_date":"2026-10-27","date_kind":"published_at","topics":["claude","anthropic","claude-code"],"entities":["Anthropic","Claude","Claude Mythos 5.1","Claude Fable 5.1","Claude Opus 5.5","Claude Sonnet 5.5","Claude Haiku 5.5","Claude Code"],"related_patterns":[],"novelty_label":"new_fact","what_changed":"A separate Oct. 25 incident caused elevated errors across five Claude models, including Mythos 5.1, Opus 5.5, Sonnet 5.5 and Haiku 5.5, for 30 minutes.","prior_refs":["memory:83c96390-2056-8134-a19b-c74b16d14117","memory:f4ea7633-87f5-8167-aa6c-357be9422cb2"],"source_url":"https://status.claude.com/incidents/334jvgbrc4ff","source_urls":["https://status.claude.com/incidents/334jvgbrc4ff"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:elevated-errors-hit-claude-mythos-5-1-fable-3b66a3","status":"published","visuals":[],"editor":{"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"routes":{"html":"https://newruntime.com/posts/elevated-errors-hit-claude-mythos-5-1-fable-3b66a3/","markdown":"https://newruntime.com/posts/elevated-errors-hit-claude-mythos-5-1-fable-3b66a3.md","json":"https://newruntime.com/posts/elevated-errors-hit-claude-mythos-5-1-fable-3b66a3.json"},"next_reads":[{"type":"topic","path":"/topics/claude/","url":"https://newruntime.com/topics/claude/","title":"Claude","reason":"Explore the claude topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/claude.md","json_url":"https://newruntime.com/topics/claude.json"},{"type":"topic","path":"/topics/anthropic/","url":"https://newruntime.com/topics/anthropic/","title":"Anthropic","reason":"Explore the anthropic topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/anthropic.md","json_url":"https://newruntime.com/topics/anthropic.json"},{"type":"topic","path":"/topics/claude-code/","url":"https://newruntime.com/topics/claude-code/","title":"Claude Code","reason":"Explore the claude-code topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/claude-code.md","json_url":"https://newruntime.com/topics/claude-code.json"},{"type":"collection","path":"/posts/","url":"https://newruntime.com/posts/","title":"Field Notes","reason":"Open the latest editorial analysis.","media_type":"text/html","json_url":"https://newruntime.com/posts.json"},{"type":"collection","path":"/source-ledger.json","url":"https://newruntime.com/source-ledger.json","title":"Source Ledger","reason":"Inspect the public source evidence graph.","media_type":"application/json"}]}