Muse Spark Open vs MiMo-V2.6-Pro

Pyyan / Compare / Muse Spark Open vs MiMo-V2.6-Pro

2 of 5

Open-Weight Models · verified 20 Oct 2026

Muse Spark OpenMetacurrent

XMiMo-V2.6-ProXiaomicurrent

Add another3 slots left

Specification	Muse Spark Open	MiMo-V2.6-Pro
Summary	The largest American open weights, under a licence with a revenue trigger.	A trillion parameters under the MIT licence.
Context	1M	1M
Input ($/Mtok)	Weights only	Weights only
Output ($/Mtok)	Weights only	Weights only
Licence	Muse Model License	MIT
Max output	Not published	Not published
Parameters	816B total, 42B active	1.02T total, 42B active
Released	15 Oct 2026	21 Sep 2026
Model ID	meta-models/Muse-Spark-Open-816B-A42B	XiaomiMiMo/MiMo-V2.6-Pro
Category	Open-Weight Models	Open-Weight Models
Official	Meta ↗	Xiaomi ↗

Highlighted rows are where these differ.

Text, image, video and audio in, text out, with a 1M token context
Muse Model License, not open source: attribution required, and a separate agreement above $20m of model-service revenue
About 1.5TB in BF16, or two Mac Studios at 4-bit

Best for multimodal work you host yourself.

1.02T total parameters, 42B active per token, a 4.1% activation ratio
Text, image, video and audio in, with a 1M token context
Shipped with 7,000+ reinforcement learning environments and the framework that trained it

Best for multimodal work on your own cluster.