Meta spent years building its reputation on open-weight Llama releases. That changed on October 12, 2026, when the company announced Muse Wonder and Muse Wonder Full, its first frontier models kept entirely closed and served only through a paid API and subscription app. For developers who have spent the past two years calling OpenAI, Anthropic or Google endpoints, Muse Wonder adds a fourth serious option, and it is built to be OpenAI SDK-compatible so switching takes minutes…
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