Meta: Muse Spark 1.3 Contributor

The contributor row is Spark 1.3 with the training-permission trade applied. The llm-releases card for the model states the deal in terms: the lower-cost contributor tier is offered "in exchange for permission to train future Meta models on prompts and completions." OpenRouter's contributor listing states the condition itself: prompts and outputs may be used to improve Meta's productssource, accessed 2026-09-03 — the same trade the org entry records for the 1.2 contributor row.

The two rows carry the same model and the same 1048576tokensopenrouter-models, last checked 2026-09-14 window; the price is where they part. The contributor row lists $0.10per million tokensopenrouter-models, last checked 2026-09-14 input against $0.20per million tokensopenrouter-models, last checked 2026-09-14 output, while the standard row lists $1.25per million tokensopenrouter-models, last checked 2026-09-14 input against $4.25per million tokensopenrouter-models, last checked 2026-09-14 output — the gap between the two rows is the listed price of that trade.