Muse Spark Open
Muse Spark Open is an open-weights AI model from Meta with an index score of 167 (GPT-4 = 100), rank 35 of 207.
167151–184Index score#35 of 207 models
$1.25/ $4.25Price per million tokensinput / output · via OpenRouter
1.05MContext windowtokens it reads at once
15 Oct 2026Released12 days ago
Where it sitson the frontier
Claude Opus 4.6 reached this score 8 months earlier.
Test resultsby area · tick = best by any model
Reasoning & knowledgeevidence
Mathsevidence
Codingevidence
Agentsevidence
Professional workevidence
Novel problemsevidence
Long tasksno evidence yet
Third-party results only, at the model’s best standard setting. Hover a bar for who ran it.
What others sayrank on 4 leaderboards
Best attop three among current models
Where to use itprices checked 27 Oct 2026
From the lab
Meta AIapp · subscription↗API providers 6 · per 1M tokens, in / out
Run it yourself
Official weightsmeta-models/Muse-Spark-Open-816B-A42B↗Host prices from OpenRouter; going direct can differ.
Facts and sources
Released15 Oct 2026
Announcementnot linked yet
Release entry–
Scored asMuse Spark Open
Output speed204 tokens/s
Hugging Facemeta-models/Muse-Spark-Open-816B-A42B ↗
