Meta unveils Muse Spark, its first small but fast AI model from Meta Superintelligence Labs

Key facts

• Meta Superintelligence Labs (MSL) developed Muse Spark, the inaugural model of Meta’s new Muse AI family.
• Alexandr Wang leads MSL after Meta acquired his startup Scale AI in a multi-billion-dollar deal.
• Muse Spark was built from scratch in about nine months and targets complex reasoning in science, mathematics and health.
• The model includes a "contemplating mode" where multiple AI agents work in parallel to solve problems.
• Muse Spark will power Meta AI assistants across Facebook, Instagram, WhatsApp, Messenger and Meta’s smart glasses.
• Meta claims Muse Spark performs competitively in multimodal reasoning, scientific problem solving, health-related analysis and agent-based workflows.
• Unlike Meta’s earlier open-source Llama models, Muse Spark is closed source and currently accessible only through a private API preview for selected partners.
• Safety evaluations showed Muse Spark refused high-risk queries related to biological or chemical misuse during internal testing.
• Larger Muse family models are under development with new infrastructure being built to support them.