{"id":"clm_D1A09315FDBF","entity":"claude","predicate":"model_release","value":"Claude Sonnet 5.5","value_json":{"feed":"claude-apps-release-notes","item":"https://support.claude.com/en/articles/12138966-release-notes#2026-09-28","tags":{"v":2,"ai":true,"by":"claude-haiku-5-5","on":"2026-10-31","themes":[],"model_tier":"mid","release_kind":"model"},"check":{"on":"2026-10-31","url":"https://support.claude.com/en/articles/12138966-release-notes#2026-09-28","pages":1,"quote":"September 28, 2026 Claude Sonnet 5.5 launch We just launched Claude Sonnet 5.5, the second model in our Claude 5.5 family.","outcome":"checked"},"evidence":"Claude Sonnet 5.5 launch · We just launched Claude Sonnet 5.5, the second model in our Claude 5.5 family. Sonnet 5.5 is a faster, lower-cost complement to Claude Opus 5.5. For more information, see our blog post: Introducing Claude Sonnet 5.5 .","extracted_by":"claude-haiku-5-5","primary_source":true},"valid_from":"2026-09-28","valid_to":null,"published":"2026-09-28","recorded":"2026-10-31","confidence":0.7,"status":"valid","assertable":true,"superseded_by":null,"supersedes":[],"first_seen_at":"2026-10-31T02:13:28.6448+00:00","updated_at":"2026-10-31T03:52:09.939321+00:00","sources":[{"url":"https://support.claude.com/en/articles/12138966-release-notes#2026-09-28","tier":"primary","publisher":"Anthropic","published_at":"2026-09-28T00:00:00+00:00"}],"evidence":{"by":"page-read","on":"2026-10-31","quote":"September 28, 2026 Claude Sonnet 5.5 launch We just launched Claude Sonnet 5.5, the second model in our Claude 5.5 family.","url":"https://support.claude.com/en/articles/12138966-release-notes#2026-09-28","excerpt":"Claude Sonnet 5.5 launch · We just launched Claude Sonnet 5.5, the second model in our Claude 5.5 family. Sonnet 5.5 is a faster, lower-cost complement to Claude Opus 5.5. For more information, see our blog post: Introducing Claude Sonnet 5.5 ."},"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"}}}