{"event":{"id":"evt-hist-phase38-meta-muse-spark-open","dedupe_key":"source_publication:2026-10-15:meta-releases-muse-spark-open-weights","event_type":"source_publication","title":"Meta releases Muse Spark Open weights","summary":"Meta Oct15 release claims 816B total / 42B active multimodal weights; vendor performance claims unreplicated.","occurred_at":"2026-10-15T00:00:00.000Z","published_at":"2026-10-15T00:00:00.000Z","observed_at":"2026-10-18T13:50:00.000Z","reconstructed_at":"2026-10-18T13:50:00.000Z","ingest_type":"historical_backfill","locations":null,"status":"verified","confidence":0.8,"metadata":{"date_precision":"day","evidence_only":1,"global_novelty_unproven":1,"original_index_position":1427,"original_supplied_day":"2026-10-15","published_at_is_day_precision_placeholder":1},"created_at":"2026-10-19T07:01:14.777Z","updated_at":"2026-10-19T07:01:14.777Z"},"artifacts":[{"id":"art-hist-phase38-meta-muse-spark-open","dedupe_key":"e596fae3003c718c12e0cc6bbcdaf7d45ce6cad1732e91ae0ac7538214ae8807","canonical_url":"https://research.meta.ai/blog/muse-spark-open","evidence_locator":"","artifact_type":"original_publication","title":"Meta releases Muse Spark Open weights","summary":"","creator_entities":[],"released_at":"2026-10-15T00:00:00.000Z","content_hash":null,"metadata":[],"created_at":"2026-10-19T07:01:14.776Z","updated_at":"2026-10-19T07:01:14.776Z","relation":"documented_by"}],"signals":[]}