{"entity":"muse-spark-open","name":"Muse Spark Open","events":[{"date":"2026-10-15","until":null,"published":"2026-10-15","recorded":"2026-11-04","predicate":"context_window","value":"1M-token","status":"valid","assertable":true,"id":"clm_086E8B7FB0F7","evidence":{"by":"page-read","on":"2026-11-04","quote":"Muse Spark Open is a natively multimodal model with 816B total parameters (42B active) and a 1M-token context window.","url":"https://research.meta.ai/blog/muse-spark-open"}},{"date":"2026-10-15","until":null,"published":"2026-10-15","recorded":"2026-11-04","predicate":"model_release","value":"Muse Spark Open","status":"valid","assertable":true,"id":"clm_D58FC12544C0","evidence":{"by":"page-read","on":"2026-11-04","quote":"Introducing Muse Spark Open, The Most Capable US Open‑Weight Model to Date October 15, 2026","url":"https://research.meta.ai/blog/muse-spark-open"}}],"complete":true,"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"}}}