{"event":{"id":"evt-hist-20260922-claude-opus55","dedupe_key":"frontier_model_release:2026-09-22:anthropic-announces-claude-opus-5-5-and-availability","event_type":"frontier_model_release","title":"Anthropic announces Claude Opus 5.5 and availability","summary":"Anthropic introduced Claude Opus 5.5 on September 22, 2026, publishing product availability and provider benchmark and pricing claims. The event is bounded to the release, not proof that performance, safety or prices match independent measurements across tasks.","occurred_at":"2026-09-22T00:00:00.000Z","published_at":"2026-09-22T00:00:00.000Z","observed_at":"2026-10-17T19:50:00.000Z","reconstructed_at":"2026-10-17T19:50:00.000Z","ingest_type":"historical_backfill","locations":null,"status":"verified","confidence":0.92,"metadata":{"date_precision":"day","evidence_only":1,"external_postcutoff_id":"2026-09-22-claude-opus-5-5","full_canonical_negative_coverage_unproven":1,"new_relation_onset":0,"previews_and_projected_outcomes_not_achieved":1},"created_at":"2026-10-17T20:18:38.795Z","updated_at":"2026-10-17T20:18:38.795Z"},"artifacts":[{"id":"art-hist-20260922-claude-opus55","dedupe_key":"3285ca782c45f5162d3be53acc304e3b5ff9d5d8954bcaed790e2fbbe4aa0330","canonical_url":"https://www.anthropic.com/claude-opus-5-5","evidence_locator":"","artifact_type":"publisher_publication","title":"Anthropic announces Claude Opus 5.5 and availability","summary":"","creator_entities":[],"released_at":"2026-09-22T00:00:00.000Z","content_hash":null,"metadata":[],"created_at":"2026-10-17T20:18:38.795Z","updated_at":"2026-10-17T20:18:38.795Z","relation":"documented_by"}],"signals":[]}