Meta releases open-source Muse Glimmer AI model, plans to open-source flagship Muse Spark 1.2

Aug 10, 2026

On August 10, 2026, Meta released Muse Glimmer, a 30-billion-parameter open-weight AI model licensed under Apache 2.0 and optimized to run autonomous agents locally on high-end consumer PCs and Macs. Alongside the release, Meta CEO Mark Zuckerberg published a 6,500-word manifesto advocating for open-source AI to counter rising Chinese dominance and criticizing closed-source rivals. Meta also announced plans to open-source its flagship frontier model, Muse Spark 1.2, in the coming weeks.

Muse Glimmer open-source release

▪Meta developed 4-bit quantized versions of Muse Glimmer to shrink the language-model weights to under 20GB, allowing the model to run on 24GB or 32GB consumer hardware.
▪Meta released Muse Glimmer, a 30-billion-parameter open-weight AI model designed to run autonomous agents locally on consumer hardware, on August 10, 2026.
▪Meta trained Muse Glimmer using logit distillation from its larger proprietary Muse Spark model, mid-trained it on agent-heavy data, and post-trained it across multiple domains.

Muse Spark 1.2 weights

▪Meta announced plans to release the weights for Muse Spark 1.2, its flagship foundation model, in the coming weeks.
▪The planned release of Muse Spark 1.2 weights would make Meta's flagship frontier model publicly downloadable, inspectable, and modifiable by anyone.

Apache 2.0 licensing shift

▪Meta released Muse Glimmer under the permissive Apache 2.0 open-source license, which allows unrestricted commercial use, modification, and redistribution.
▪The Apache 2.0 license for Muse Glimmer represents a shift from the restrictive custom community license Meta used for its Llama family of models.

US-China AI competition

▪Chinese open-weight models from DeepSeek, Alibaba, and Z.ai have gained traction among US businesses as low-cost alternatives to American models.
▪By May 2026, Chinese open-weight models accounted for approximately 61% of all tokens consumed on the OpenRouter platform.
▪Mark Zuckerberg warned that American AI companies face training data restrictions that give foreign competitors, particularly Chinese labs, an advantage.

Zuckerberg AI manifesto

▪Mark Zuckerberg criticized AI competitors for 'doom' messaging and argued that concentrating AI power among a few companies is inherently problematic.
▪Mark Zuckerberg published a 6,500-word manifesto on August 10, 2026, titled 'The Future is for Everyone: The Path to a Positive AI Future'.