Meta’s Muse Spark is here – and it’s closed source

In short: Meta has released Muse Spark, the first model from Meta Superintelligence Labs, the unit it assembled under Alexandr Wang after spending $14.3 billion to acquire a stake in Scale AI. Rebuilt from scratch over nine months, the model is natively multimodal, introduces a “Contemplating” reasoning mode that runs sub-agents in parallel, and is now powering Meta AI across the company’s platforms. In a break from Meta’s Llama heritage, it is closed source.

The model’s arrival closes a chapter that began in June 2025, when Mark Zuckerberg announced Meta Superintelligence Labs and installed Wang as the company’s first-ever chief AI officer. The mandate was explicit: catch up with OpenAI, Anthropic, and Google, and do so with a team and infrastructure rebuilt specifically for the task. Nine months later, that team has something to show for it.

Nine months to rebuild the stack

“Nine months ...