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Meta releases open-weight Muse Spark model for coding, agentic tasks

By Thomson Reuters Oct 15, 2026 | 4:19 PM

Oct 15 (Reuters) – Meta Platforms on Thursday released an open-weight version of its Muse Spark artificial ​intelligence model for coding and ‌AI agents, expanding developers’ ability to download and adapt the technology.

Open-weight models make trained parameters available for developers to modify, ‌unlike ​proprietary models that ⁠remain under their creators’ ⁠control. They can offer businesses a lower-cost alternative to closed systems.

• Meta said Muse Spark has 816 ​billion total parameters, with 42 billion active at a time, ⁠and can handle a ⁠context window of up ​to 1 million tokens

• The model can ​run locally on two Apple M5 ‌Ultra Mac Studio computers and is also available through some API providers

• CEO Mark Zuckerberg has argued ⁠that advanced AI should not be concentrated among a small number of companies

• While ⁠open-weight ‌models can give companies ⁠greater control over their data, ​they ‌can require significant computing ​resources and ⁠technical expertise to operate at scale

• In August, Meta had released Muse Glimmer, a smaller open-weight model

(Reporting by Pragyan Kalita in Bengaluru; Editing by ​Diti Pujara)