Muse Spark Open 816B A42b

Muse Spark Open 816B A42b is a Meta open-weights reasoning model, released 15 Oct 2026. Its best configuration (xhigh reasoning effort) ranks #166 of 761 on the BenchLeader Index at 57.4 ±6.8, in the upper half. The ± is the point: 311 other configurations score within that range, so they and this one cannot be told apart on quality alone — price and speed are what separate them. It scores highest in reasoning (64) and lowest in maths (60). At $2.00 per million tokens blended it is pricier than most ranked models. Last measured 15 Oct 2026.

Blended price

$2.00/M

$1.25 in · $4.25 out

Output speed

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First answer

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Context

1.0M

Full answer

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Cost per run

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Released

15 Oct 2026