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Map / Core AI / Foundation Models / Muse / Spark Open

Muse Spark Open

by Meta AI · part of Muse · Text · open weights

The open-weight release of Muse Spark: an 816B mixture-of-experts model with 1M-token context for coding and agents.

Latest version

Spark Open 1.015 Oct 2026 · 13 days ago

Versions

1since Muse Spark Open in October 2026

All versions

VersionReleasedAfter previousStatusComes asSource
Muse Spark Open15 Oct 2026FirstLatest816B total / 42B activeBF16NVFP4research.meta.ai

Dates from Meta AI's own announcements; each row links to its source.

The Muse family

2026TodaySparkMuse Spark, 8 Apr 20261.0Muse Spark 1.1, 9 Jul 20261.1Muse Spark 1.2, 5 Aug 20261.2Muse Spark 1.3, 2 Sep 20261.3WonderMuse Wonder, 12 Oct 2026, preview1.0Spark OpenMuse Spark Open, 15 Oct 20261.0GlimmerMuse Glimmer, 10 Aug 20261.0

VersionPreviewLatest version

Questions

What is the latest version of Muse Spark Open?

Muse Spark Open, released on 15 Oct 2026.

When was Muse Spark Open released?

Muse Spark Open came out on 15 Oct 2026.