Meta releases open-weight Muse Glimmer model, Zuckerberg defends open AI

Meta released Muse Glimmer, a 30-billion-parameter open-weight agentic model from its new Superintelligence Labs that can run on a single consumer GPU once compressed. Alongside the release, Mark Zuckerberg published a roughly 6,500-word essay defending distillation of rival labs' models and arguing for fewer restrictions on US AI labs. An open-weight version of Muse Spark 1.2 is reportedly expected to follow.

Why it matters: This is Meta's most direct counter-move yet against OpenAI and Anthropic's closed-model approach, framing open weights as a competitive weapon against Chinese labs rather than a safety compromise. Zuckerberg's public defense of distillation is notable given ongoing industry disputes over labs training on each other's outputs, and a 30B model that fits on consumer hardware could meaningfully widen who can run capable agentic models locally.