{"entity":"claude-fable-5-1","id":"ent_claude-fable-5-1","name":"Claude Fable 5.1","predicate":"model_release","label":"release date","page":"https://asof.is/record/claude-fable-5-1/model_release","as_of":"2026-11-04","summary":"As of November 4, 2026, the AsOf record says Claude Fable 5.1 was released on September 1, 2026, from a primary source (platform.claude.com). The record holds 1 claim on Claude Fable 5.1's release, 1 still open and 0 superseded, each dated and sourced; a replaced value is closed with an end date, never deleted.","current":["clm_B087F24135EA"],"latest_period":null,"claims":[{"id":"clm_B087F24135EA","value":"Claude Fable 5.1","valid_from":"2026-09-01","valid_to":null,"published":null,"recorded":"2026-11-04","confidence":0.95,"status":"valid","assertable":true,"superseded_by":null,"sources":[{"url":"https://platform.claude.com/docs/en/release-notes/overview","tier":"primary","publisher":"Anthropic (Claude Platform release notes)","published_at":null}],"evidence":{"by":"page-read","on":"2026-11-04","quote":"September 1, 2026 We’ve launched Claude Fable 5.1 ( claude-fable-5-1 ), the successor to Claude Fable 5 for long-running agentic coding, knowledge work, and research, alongside Claude Mythos 5.1 ( claude-mythos-5-1 ) for Project Glasswing participants.","url":"https://platform.claude.com/docs/en/release-notes/overview"}}],"replaced":[],"faq":[{"question":"When was Claude Fable 5.1 released?","answer":"On September 1, 2026, from a primary source (platform.claude.com) (status valid, confidence 0.95)."}],"legend":{"dates":"valid_from: when the claim took effect (a period figure: the day its period closed). published: the earliest day a source on the record published it (a filing's filing date, a post's date; null when no source carries one). recorded: the day AsOf first held it. A figure can take effect weeks before it is published.","why_not":{},"checked_by":{"page-read":"its source page states the value and the date"}}}