{"id":"INC-anthropic-334jvgbrc4ff","kind":"incident","aliases":[],"related":[],"title":"Anthropic: Elevated errors for multiple models","description":"We are investigating elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5. We will provide an update as soon as possible.","summary":null,"severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Anthropic","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["ai","anthropic","incident","llm","ops","vendor"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"resolved","published_at":"2026-10-25T06:14:18+00:00","first_seen_at":"2026-10-25T06:15:43+00:00","triaged_at":"2026-10-25T06:16:44+00:00","updated_at":"2026-10-25T07:55:51+00:00","category":"vendor","confidence":null,"triage":null,"analyst_status":null,"analyst_note":null,"search":"'334jvgbrc4ff':10A '5.1':28C,31C '5.5':34C,37C,41C 'ai':12B 'anthrop':1A,13B 'anthropic':9A,11A 'claud':26C,29C,32C,35C,39C 'elev':2A,21C 'error':3A,22C 'fabl':30C 'haiku':40C 'inc':8A 'inc-anthropic-334jvgbrc4ff':7A 'incid':14B 'investig':20C 'llm':15B 'model':6A 'multipl':5A 'mytho':27C 'op':16B 'opus':33C 'possibl':50C 'provid':44C 'request':24C 'sonnet':36C 'soon':48C 'updat':46C 'vendor':17B","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-25T06:14:18+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"statuspage","external_id":"anthropic:334jvgbrc4ff","url":"https://stspg.io/s3wd6gmdsdhn","severity":"high","published_at":"2026-10-25T06:14:18+00:00","modified_at":"2026-10-25T07:53:39+00:00","first_seen_at":"2026-10-25T06:15:43+00:00","fetched_at":"2026-10-25T21:30:41+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}