Muse Wonder: Meta's new model for Muse remembers across chats and keeps going on hard tasks

Meta has two new models built for agents, Muse Wonder and Muse Wonder Full. They're Meta's most capable models so far, and Muse Wonder is the one coming to the Muse app.

With Active Memory, Muse Wonder carries what matters to you from one conversation to the next. On a test of remembering a long history, both Wonder models beat Claude Opus 5.5 and GPT-6 Astra.

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Active Memory brings back the details a task needs.

Meta AI Research · “Muse Wonder” · research.meta.ai · Oct 12, 2026

Active Focus is the second new ability. When a task gets hard, Muse Wonder tries other approaches and recovers from errors. It asks when something is unclear, and checks in before anything important.

Both models are built for expert work in law, finance and health. That covers jobs like navigating an insurance claim, understanding a lease, or making sense of someone's finances.

Both models write code, from a game to an app for a new business. On long software projects, Muse Wonder Full gets furthest, ahead of Claude Opus 5.5, Claude Fable 5.1 and GPT-6 Astra.

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From a game to an app for a new business.

Meta AI Research · “Muse Wonder” · research.meta.ai · Oct 12, 2026

Developers can use Muse Wonder today, through the Meta Model API and the Muse Code coding agent. Muse Wonder Full is available today too, for Muse Code subscribers.

An agent works across your messages, calendar and documents, so Muse Wonder is trained to share private information only with your permission. It mishandles personal information less often than GPT-6 Astra or Claude Fable 5.1.

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It mishandles personal information less often than GPT-6 Astra or Claude Fable 5.1.

Meta AI Research · “Muse Wonder” · research.meta.ai · Oct 12, 2026

In the Muse app, Muse Wonder will soon power more of Muse, rolling out to subscribers first. The full safety report is still to come. Every result is in the Muse Wonder research post.