Meta released Muse Wonder and Muse Wonder Full; developers can access Muse Wonder through Meta Model API and Muse Code.

Meta announced Muse Wonder and Muse Wonder Full, with Muse Wonder available through Meta Model API and Muse Code. The reports identify Muse Wonder’s internal codename as “Watermelon” and say the model is also intended to power a subscription version of Meta’s personal AI agent, Muse.

Meta describes the models as suited to personal and professional agent tasks, including programming and handling legal, financial, and health information. Its claim that Muse Wonder exceeds Claude Opus 5.5, Fable 5.1, and GPT-6 Astra on selected technical benchmarks is not accompanied by benchmark names, scores, or evaluation methods in the supplied material.

Meta’s AI chief Alexandr Wang, an individual executive, emphasized personal-agent use cases as a differentiator from ecosystems focused on coding agents. Mark Zuckerberg said the development required substantial compute infrastructure and AI talent, and indicated that Meta was already working on more capable models; these are management statements rather than independently measured competitive outcomes.

An operational follow-up reported a bug causing Muse Wonder and Muse Wonder Full usage to count against Muse Code subscribers’ limits in an unintended manner. Wang said Meta was working on a fix and would reset affected allowances after completion; the supplied messages do not confirm that the fix had been completed.