{"id":"clm_CB831FEFF322","entity":"claude-sonnet-5","predicate":"predecessor","value":"Sonnet 4.6","value_json":{"check":{"by":"research, quote read on the page","on":"2026-11-04","url":"https://support.claude.com/en/articles/12138966-release-notes","quote":"June 30, 2026 Claude Sonnet 5 launch We launched Claude Sonnet 5, our most agentic Sonnet model yet, with substantial improvements over Sonnet 4.6 in reasoning, tool use, coding, and knowledge work.","outcome":"checked","dated_by":"quote"},"entity":"claude-sonnet-4-6"},"valid_from":"2026-06-30","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://support.claude.com/en/articles/12138966-release-notes","tier":"primary","publisher":"Anthropic (news)","published_at":null}],"evidence":{"by":"page-read","on":"2026-11-04","quote":"June 30, 2026 Claude Sonnet 5 launch We launched Claude Sonnet 5, our most agentic Sonnet model yet, with substantial improvements over Sonnet 4.6 in reasoning, tool use, coding, and knowledge work.","url":"https://support.claude.com/en/articles/12138966-release-notes"},"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"}}}