meta just promised to open-source the AI model that actually rivals GPT and Claude

Muse Spark 1.2 isn't the laptop-sized model Meta gave away last week — it's the one built to fight Claude Opus 5 and GPT-5.6 head-on, and Zuckerberg… Aliteq Lena Fischer · AI & Local Compute Editor

Muse Spark 1.2 is Meta's flagship model, benchmarked against Anthropic's Opus 5, OpenAI's GPT-5.6 Terra, and Google's Gemini 3.6 Flash — not a scaled-down local model.

It currently sits fifth on the Artificial Analysis Intelligence Index and powers Muse Code, Meta's terminal-based coding agent.

Meta launched Muse Spark as a proprietary, API-only model in April 2026, after retiring the Llama family — this is a direct reversal of that strategy.

Meta also opened the weights of Muse Glimmer, a separate 30-billion-parameter model built for running on a single consumer GPU or laptop.

No firm release date exists yet. Zuckerberg said 'in the coming weeks' — that's a promise, not a changelog entry.

Foreign labs currently hold several advantages here since American labs have to comply with many additional restrictions on training data. US policy must reduce this additional friction if we want…

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