As of: 2026-10-16 12:39 CEST.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/p/2026-10-15-zuckerberg-muse-spark-open-mac-studios/

# Mark Zuckerberg: 'Muse Spark Open -- weights releasing today -- runs great on new Mac Studios thanks to work with @johnternus and Apple'

Mark Zuckerberg (@finkd), X, 2026-10-15.
Source: https://x.com/finkd/status/2110778025629347999

## Why it matters

Highest-reach post of the Muse Spark Open launch (~1.58M views) and the public start of the Meta–Apple AI collaboration.

## Summary

Zuckerberg announced the open-weight release and credited Apple CEO John Ternus. About 1.58M views and 22.5k likes by the morning of
Oct 16 (fxtwitter). Ternus replied with congratulations; 9to5Mac's Chance Miller remarked that Zuckerberg had to use X because Apple
does not use Threads (~243k views).

## Archived text

> Muse Spark Open -- weights releasing today -- runs great on new Mac Studios thanks to work with @johnternus and Apple.

Archived 2026-10-16 via fxtwitter (unofficial).
Counts: 1,608,433 views, 22,700 likes, 1,236 reposts, 825 replies (at fetch time)
Media: https://pbs.twimg.com/media/HUr9XldXIAAPeX3.jpg?name=orig

## Cited in

- 2026-10-15: [Meta releases Muse Spark Open, an 816B open-weight model built with Apple to run on Mac Studios](https://postcutoff.com/e/2026-10-15-meta-muse-spark-open/)