Muse Spark Open specs, prices, where it runs and its benchmark standing

Name: Muse Spark Open
Author: Meta

open weights · top 10 on 0 of 3 · released Oct 15, 2026

Provider: Meta
Release date: Oct 15, 2026; Pricing
Parameters: 822B total, 42B active per token; Hugging Face
Modalities: Text, Image, Audio, Video, Files to Text; OpenRouter
License: Muse Model License; Hugging Face
Context window: 1.05M tokens; Pricing
Pricing: $1.25 in / $4.25 out per 1M tokens; All prices
Hosting: 5 priced API routes · OpenRouter · self-host: weights on Hugging Face; Pricing
Hardware: Estimate: about 1644 GB of weights as published (BF16), about 822 GB at 8-bit, about 411 GB at 4-bit, plus memory for the context; Hugging Face config
Weights: Open weights
Benchmarks: 3 boards captured

Rank	Board	Category	Score	Of
11	SWE-Bench ProCoding · as “Muse Spark Open (mini-swe-agent) xhigh”	Coding	82.3%	16
15	AA PricePrice · as “Muse Spark Open (Xhigh)”	Price	$2.00	31
36	Epoch ECIReasoning · as “Muse Spark Open”	Reasoning	155.1	100

Versions and release history

2 versions in this line since Oct 15, 2026, from Pricing, OpenRouter and the boards.

Version	Released	Source
Muse Spark Openthis model	Oct 15, 20266 days ago	Pricing
Muse Spark Open 816B A42B	Oct 15, 20266 days ago	Boards

Category ranks, more models and catalog changes