{"id":"INC-anthropic-h101vcmhnfky","kind":"incident","aliases":[],"related":[],"title":"Anthropic: Elevated errors for Claude Fable 5.1","description":"We have identified the cause of elevated errors on requests to Claude Fable 5.1, Sonnet 5.5, and Haiku 5.5, as well as fast mode requests to Opus 5.5 and are working on a fix. We will provide an update as soon as possible.","summary":null,"severity":"critical","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":"2026-10-23T23:37:42+00:00","first_seen_at":"2026-10-23T23:38:48+00:00","triaged_at":"2026-10-25T04:51:22+00:00","updated_at":"2026-10-25T04:51:22+00:00","category":"vendor","confidence":null,"triage":null,"analyst_status":null,"analyst_note":null,"search":"'5.1':7A,32C '5.5':34C,37C,46C 'ai':13B 'anthrop':1A,14B 'anthropic':10A,12A 'caus':23C 'claud':5A,30C 'elev':2A,25C 'error':3A,26C 'fabl':6A,31C 'fast':41C 'fix':52C 'h101vcmhnfky':11A 'haiku':36C 'identifi':21C 'inc':9A 'inc-anthropic-h101vcmhnfky':8A 'incid':15B 'llm':16B 'mode':42C 'op':17B 'opus':45C 'possibl':61C 'provid':55C 'request':28C,43C 'sonnet':33C 'soon':59C 'updat':57C 'vendor':18B 'well':39C 'work':49C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-23T23:37:42+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"statuspage","external_id":"anthropic:h101vcmhnfky","url":"https://stspg.io/gqp288t3qzpt","severity":"critical","published_at":"2026-10-23T23:37:42+00:00","modified_at":"2026-10-24T00:11:20+00:00","first_seen_at":"2026-10-23T23:38:48+00:00","fetched_at":"2026-10-26T00:57:47+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"}