{"id":"clm_FF2C96341E44","entity":"claude-fable-5-1","predicate":"context_window","value":"1M token context window","value_json":{"note":"sentence of the September 1, 2026 entry (Fable 5.1 and Mythos 5.1); the June 9 Fable 5 entry has the same wording without the price","check":{"by":"research, quote read on the page","on":"2026-11-04","url":"https://platform.claude.com/docs/en/release-notes/overview","quote":"Both models support a 1M token context window by default, 128k max output tokens, and always-on adaptive thinking , at $10 / $50 USD per MTok","outcome":"checked","dated_by":"near"}},"valid_from":"2026-09-01","valid_to":null,"published":null,"recorded":"2026-11-04","confidence":0.95,"status":"valid","assertable":true,"superseded_by":null,"supersedes":[],"first_seen_at":"2026-11-04T02:40:06.661518+00:00","updated_at":"2026-11-04T02:40:23.583789+00:00","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":"Both models support a 1M token context window by default, 128k max output tokens, and always-on adaptive thinking , at $10 / $50 USD per MTok","url":"https://platform.claude.com/docs/en/release-notes/overview"},"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"}}}