Meta Superintelligence Labs releases Muse Spark

Background

Muse Spark came from Meta Superintelligence Labs (MSL), the lab that Mark Zuckerberg announced and that Alexandr Wang leads. TechCrunch described the model as a ground-up overhaul of Meta's AI, led by Wang.^[2] Muse is the name of the model series that Muse Spark started.^[1]

What happened

On 8 April 2026 Meta released Muse Spark, the first model from MSL and the first of the Muse series.^[1][2] Muse Spark is a natively multimodal reasoning model with tool use, visual chain of thought and multi-agent orchestration.^[1]

Key details

Capabilities. Visual chain of thought means the model reasons through an image step by step. Multi-agent orchestration means one model coordinates several sub-agents that work on parts of a task. Tool use means the model can call outside programs, such as search, to get information or take an action.^[1]

Modes. Muse Spark powers the Meta AI app and meta.ai. It has Instant and Thinking modes, and a Contemplating mode that runs parallel agents.^[3][1] Instant mode answers quickly, while Thinking mode spends more time reasoning before answering. Contemplating mode splits work among agents that run at the same time.

Benchmark. Meta reported 58% on Humanity's Last Exam in Contemplating mode. It said the model needed over an order of magnitude less compute than Llama 4 Maverick to reach the same capabilities.^[1] Humanity's Last Exam is a difficult benchmark of expert-level questions. "An order of magnitude less" means roughly ten times less.

Weights. Unlike the Llama models, Muse Spark's weights were not released. Select partners received a private API preview. Meta said it hoped to open-source future versions.^[3] An API preview lets approved developers send requests to the model without having a copy of it.

Expansion. On 12 May 2026 Meta expanded Muse Spark to WhatsApp, Instagram, Facebook, Messenger, Threads and its smart glasses.^[3]

Impact

Muse Spark was the first model from the new lab, and it moved Meta's assistant onto a new model family. Its weights were not released, which set it apart from the open Llama line, although Meta said it hoped to open-source future versions. By 12 May 2026 it had reached Meta's messaging apps, Facebook, Threads and its smart glasses, which shows how widely the model was placed across Meta's products.^[1][2][3]