{"id":"INC-github-wt3hjqcrczfg","kind":"incident","aliases":[],"related":[],"title":"GitHub: Elevated errors on Fable 5 due to upstream provider","description":"On August 24th, 2026, between approximately 06:35 and 07:25 UTC, the Copilot service experienced a degradation of the Claude Fable 5 model due to an issue with our upstream provider. Users encountered elevated error rates when using Claude Fable 5, with requests sometimes failing mid-response. No other models were impacted.The issue was resolved by a mitigation put in place by our provider. GitHub is working with our provider to further improve the resiliency of the service to prevent similar incidents in the future.","summary":null,"severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"GitHub","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["ci","git","github","incident","ops","vendor"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"resolved","published_at":"2026-08-24T07:12:05+00:00","first_seen_at":"2026-10-23T19:12:22+00:00","triaged_at":"2026-10-23T21:52:55+00:00","updated_at":"2026-10-23T21:52:55+00:00","category":"vendor","confidence":null,"triage":null,"analyst_status":null,"analyst_note":null,"search":"'06':28C '07':31C '2026':25C '24th':24C '25':32C '35':29C '5':6A,44C,63C 'approxim':27C 'august':23C 'ci':16B 'claud':42C,61C 'copilot':35C 'degrad':39C 'due':7A,46C 'elev':2A,56C 'encount':55C 'error':3A,57C 'experienc':37C 'fabl':5A,43C,62C 'fail':67C 'futur':108C 'git':17B 'github':1A,13A,15A,18B,88C 'impacted.the':75C 'improv':96C 'inc':12A 'inc-github-wt3hjqcrczfg':11A 'incid':19B,105C 'issu':49C,76C 'mid':69C 'mid-respons':68C 'mitig':81C 'model':45C,73C 'op':20B 'place':84C 'prevent':103C 'provid':10A,53C,87C,93C 'put':82C 'rate':58C 'request':65C 'resili':98C 'resolv':78C 'respons':70C 'servic':36C,101C 'similar':104C 'sometim':66C 'upstream':9A,52C 'use':60C 'user':54C 'utc':33C 'vendor':21B 'work':90C 'wt3hjqcrczfg':14A","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2026-08-24T07:12:05+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"statuspage","external_id":"github:wt3hjqcrczfg","url":"https://stspg.io/4dz9rv14dz14","severity":"high","published_at":"2026-08-24T07:12:05+00:00","modified_at":"2026-08-27T14:51:10+00:00","first_seen_at":"2026-10-23T19:12:22+00:00","fetched_at":"2026-10-25T14:56:49+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"}