OpenRouter lists Meta Muse Spark Open at USD $1.25 per 1M input tokens and $4.25 per 1M output tokens, with a 1,048,576-token context window. Its API routes to multiple upstream providers including Together, Nebius Token Factory, Fireworks and Baseten; actual availability and caching terms depend on routing.
Use-case fit and limitations from the existing resource record.
Available
Non-price resource facts only; pricing, history, and evidence stay in their own sections.
Decision visuals remain traceable to the existing source and verification record.
Independent ranking · native prices · evidence-linked · commercial relationships isolated from scoring and publication.