{"event":{"id":"evt-2025q3-sonnet45","dedupe_key":"historical_material_change:2025-09-29:claude-sonnet-4-5-is-released","event_type":"historical_material_change","title":"Claude Sonnet 4.5 is released","summary":"Anthropic releases Sonnet 4.5 alongside agent development and context-management tools.","occurred_at":"2025-09-29T00:00:00.000Z","published_at":"2025-09-29T00:00:00.000Z","observed_at":"2026-10-10T06:24:42.000Z","reconstructed_at":"2026-10-10T06:24:42.000Z","ingest_type":"live_world_scan","locations":null,"status":"verified","confidence":0.96,"metadata":{"what_happened_at_time":"Anthropic releases Sonnet 4.5 alongside agent development and context-management tools.","what_must_not_be_inferred":"Long-horizon vendor demonstrations do not establish unattended success rates across real production tasks.","availability_status":"model_release","affected_layers":["layer-models","layer-agents","layer-software"],"epistemic_status":"observed_fact","reported_capabilities_are_actor_claims":true,"time_precision":"day"},"created_at":"2026-10-10T08:31:22.782Z","updated_at":"2026-10-10T08:31:22.782Z"},"artifacts":[{"id":"art-2025q3-sonnet45","dedupe_key":"236485e7515833ef112360ca4c51ec3bc314c6d3075bc42cff4a748b1d112e1a","canonical_url":"https://www.anthropic.com/news/claude-sonnet-4-5","evidence_locator":"","artifact_type":"official_announcement","title":"Claude Sonnet 4.5 is released","summary":"Anthropic releases Sonnet 4.5 alongside agent development and context-management tools.","creator_entities":["Anthropic"],"released_at":"2025-09-29T00:00:00.000Z","content_hash":null,"metadata":{"historical_scope":"2025-Q3","availability_status":"model_release"},"created_at":"2026-10-10T08:31:22.775Z","updated_at":"2026-10-10T08:31:22.775Z","relation":"documented_by"}],"signals":[{"id":"sig-2025q3-sonnet45","statement":"Anthropic releases Sonnet 4.5 alongside agent development and context-management tools. Long-horizon vendor demonstrations do not establish unattended success rates across real production tasks.","signal_type":"historical_layer_delta","direction":"increasing","confidence":0.9,"epistemic_status":"supported_inference","mapping_mode":"retrospective","reconstructed_at":"2026-10-10T06:24:42.000Z","created_at":"2026-10-10T08:31:22.788Z","updated_at":"2026-10-10T08:31:22.788Z"}]}