# Meta releases Muse Spark Open with a 1M-token context window

_Published Friday, October 16, 2026 at 6:18 AM EDT · AI · Latest · Tier 2 — Notable_

![Meta releases Muse Spark Open with a 1M-token context window — Primary](https://jf.x.com/images/post/2110779754274292212.png)

Meta says it has released Muse Spark Open, an open-weight model built for coding, complex software engineering and tasks requiring multiple reasoning steps. The company lists 816B total parameters, with 42B active, and a 1M token context window.

The model natively handles text, images, video and audio. Its claimed strengths include long-horizon tasks; those performance claims come from Meta.

## Sources

- [AI at Meta (@AIatMeta)](https://x.com/AIatMeta/status/2110779754274292212)

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Canonical: https://techandbusiness.org/newswire/gB8IeNtuUahdNZubPggdOE
Published: 2026-10-16T10:18:35.159Z
Story chronology: 2026-10-15T17:08:04.000Z
Retrieved: 2026-10-16T13:02:46.032Z
Publisher: Tech & Business (techandbusiness.org)