Meta unveiled Muse Wonder and positioned it as the company's highest-end engine for assistant-style agents. Alexandr Wang, who leads Meta AI, said the system - internally nicknamed Watermelon - was built to boost "personal and professional agents" so they can handle tasks like booking dinner or checking availability without tripping over the basics. In an interview on Monday, he said real-world chores hit snags, so the team trained the model to try different tactics rather than stall and to loop back with the user when needed.
Following last month's debut of the agent app from Meta, Apple's App Store rankings quickly saw Muse reach number one. The app is free to download, with optional subscriptions for increased usage.
Mark Zuckerberg revealed the Muse Charm device at Meta Connect in Menlo Park, California, US, on Wednesday, Sept. 23, 2026.
Using Muse Wonder inside the Muse personal agent app requires a monthly plan of $20 or $100. It is part of Meta's broader push to make money from AI beyond its core ads business.
Meta wrote that the latest model "offers our strongest safeguards to date" against "cyber misuse." For now, those extra protections are only included with the paid model.
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Wang said Meta's AI team is tracking agent-related "incidents or issues" with Muse to spot problems and fix them. Some users on social media claimed the agent accessed private messages without permission, a claim the company disputed. Wang added that "there are certainly instances users have authorized various communications or whatnot earlier in a conversation, and then may have forgotten about that," and said Meta is educating people on those settings "to ensure that consumers can trust the product going forward."
Developers who buy access to the company's Meta Model API can use Muse Wonder. Wang said that access will cost more than the standard Muse subscriptions because it is a "much larger model and at frontier level," while still being priced "meaningfully below" leading offerings from OpenAI and Anthropic. An even stronger version, Muse Wonder Full, will only be offered to developers subscribing to the Muse Code AI agent at $50 or $200 per month.
Meta is turning its most capable assistant tech into a subscription and developer product, creating fresh, non-ad revenue streams tied to usage. The pitch hinges on three things most people care about: whether the paid tiers feel worth it, whether developers actually build on the API and Muse Code, and whether trust holds up as real-world "incidents or issues" pop up. Keep an eye on those adoption and reliability signals if you want to understand how this could ripple into your own budget, not just Meta's earnings.
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