Model identifier: meta-models/Muse-Spark-Open-816B-A42B.
Meta open-weight multimodal mixture-of-experts model for agentic and coding workloads.
816B total parameters, 42B active. Self-hosted or accessed via third-party inference providers; not hosted on Meta Model API. Checkpoint ID source: https://dev.meta.ai/docs/muse-spark-open/get-the-model . License and use policy: https://huggingface.co/meta-models/Muse-Spark-Open-816B-A42B/blob/main/LICENSE.md . Hosting prices depend on the deployment provider.
Official model documentation: https://dev.meta.ai/docs/muse-spark-open Researched on 23 October 2026. Undocumented specifications are omitted.