ModelMeta · Joined Oct 15, 2026 · Muse

Muse Spark Open

Meta's open-weight multimodal model for coding and agentic work, with 816B total parameters (42B active) and a 1M-token context window.

Available for Baseten, groq, modal, nebius and openRouter

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36th of 270 on Epoch Capabilities Index

The basics

Checked Oct 31

Status: Available

Updates

Oct 15

New release

Meta releases Muse Spark Open with open weights

Meta released Muse Spark Open, an open-weight mixture-of-experts model with about 816B total and 42B active parameters and a context window up to 1M tokens, trained for agentic coding.

Full changelog, by month

Strengths and weaknesses

Strengths

Coding, agentic work, long-horizon tasks, complex software engineering and multi-step reasoning

Role

General-purpose model at Meta

Muse Spark OpenCurrent
Oct 2026 to now · 1 month

Similar models

Muse Wonder

$4 in, $20 out

Muse Spark 1.3

$1.25 in, $4.25 out

Muse Glimmer

Model

Similar models for now. Real viewing data comes after launch.

Where it works

Place	Type	Price per 1M tokens, in / out	Uptime
Fireworks	API host	$1.25 / $4.25	100%
Makora	API host	$1.25 / $4.25	100%
Modal	API host	$1.25 / $4.25	100%
Together	API host	$1.25 / $4.25	99.2%
Nebius	API host	$1.25 / $4.25	100%
BaseTen	API host	$1.25 / $4.25	100%

Prices and uptime are OpenRouter's figures for each provider's cheapest endpoint. Uptime covers the last 24 hours.

Benchmarks

Higher is better. Green is Muse Spark Open. Dark marks are similar models.

Independent

What people say

Reviews

No reviews yet. Be the first to review Muse Spark Open.

Used Muse Spark Open? Tell other builders what worked and what did not.

Research sources

Researched Oct 31, 2026. Each section's own sources open with its Show sources button.