{"id":"clm_827FD86AFC2D","entity":"claude","predicate":"feature_added","value":"custom content documents","value_json":{"feed":"claude-platform-release-notes","item":"https://platform.claude.com/docs/en/release-notes/overview#2025-01-23","tags":{"v":2,"ai":true,"by":"claude-haiku-5-5","on":"2026-11-15","themes":["developer_platform"]},"check":{"on":"2026-11-15","url":"https://platform.claude.com/docs/en/release-notes/overview#2025-01-23","pages":1,"quote":"January 23, 2025 We’ve launched citations capability in the API, allowing Claude to provide source attribution for information. Learn more in Citations . We’ve added support for plain text documents and custom content documents in the Messages API.","outcome":"checked"},"evidence":"We’ve launched citations capability in the API, allowing Claude to provide source attribution for information. Learn more in Citations . · We’ve added support for plain text documents and custom content documents in the Messages API.","extracted_by":"claude-haiku-5-5","primary_source":true},"valid_from":"2025-01-23","valid_to":null,"published":"2025-01-23","recorded":"2026-11-14","citation":{"plain":"AsOf. \"Claude feature added: custom content documents\", as of 2025-01-23. Claim clm_827FD86AFC2D, https://asof.is/claim/clm_827FD86AFC2D, accessed 2026-11-15. Source: https://platform.claude.com/docs/en/release-notes/overview#2025-01-23.","url":"https://asof.is/claim/clm_827FD86AFC2D","accessed":"2026-11-15"},"confidence":0.7,"status":"valid","assertable":true,"superseded_by":null,"supersedes":[],"first_seen_at":"2026-11-14T14:27:47.503686+00:00","updated_at":"2026-11-15T11:07:07.262332+00:00","sources":[{"url":"https://platform.claude.com/docs/en/release-notes/overview#2025-01-23","tier":"primary","publisher":"Anthropic","published_at":"2025-01-23T00:00:00+00:00"}],"evidence":{"by":"page-read","on":"2026-11-15","quote":"January 23, 2025 We’ve launched citations capability in the API, allowing Claude to provide source attribution for information. Learn more in Citations . We’ve added support for plain text documents and custom content documents in the Messages API.","url":"https://platform.claude.com/docs/en/release-notes/overview#2025-01-23","excerpt":"We’ve launched citations capability in the API, allowing Claude to provide source attribution for information. Learn more in Citations . · We’ve added support for plain text documents and custom content documents in the Messages API."},"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.","citation":"citation: how to cite the row (plain: one sentence with the value, its as-of date, the claim id and URL, the day answered and the primary source; url: the claim page; accessed: the day answered). APA and BibTeX forms are on the claim page.","why_not":{},"checked_by":{"page-read":"its source page states the value and the date, as read by an AI model"}}}