Source details
- Original source
- Rowan Cheung
- Published
- 2026-08-11
- Primary topic
- Developer Tools
Why it matters
Coding copilots, APIs, SDKs, open-source releases, dev workflows, and engineering infrastructure. This item originated as a short-form social post, so the context blocks below help expand it into tools, models, and evaluation guides.
What happened
Open source is so back. Zuck just announced Meta is opening the weights for Muse Glimmer, with Muse Spark 1.2 coming soon But a year ago, everyone doubted Meta's position in the AI race In an interview I did with him, he admitted where they missed the mark: "Llama 4 was not on the trajectory that I thought it needed to be on. It was in many ways a big improvement over Llama 3, but we weren't trying to be a bit better than Llama 3. We're a frontier lab. It wants to be doing leading work." So he blew it up and rebuilt: "I felt like I'd learned enough about how to set up a lab that I wanted to reformulate the work we were doing." His conviction behind the rebuild: "AI is gonna be the most important technology in our lives, in our lifetimes. Building the capacity to build absolutely leading models is gonna be really critical for unlocking creativity." Video Mark Zuckerberg (@finkd) Today we're also opening the weights for Muse Glimmer, a great 30B parameter dense model that can run locally. Soon we'll also release the weights for Muse Spark 1.2, our latest foundation model. Meta is a strong supporter of open source and I'm proud of these releases. Congrats to @alexandr_wang and the MSL team for all your great work on these models. — https://nitter.net/finkd/status/2086755195535413696#m
What to do next
Jump to coding tools and tutorials to see whether the release changes real implementation speed, reliability, or cost.
Open source is so back. Zuck just announced Meta is opening the weights for Muse Glimmer, with Muse Spark 1.2 coming soon But a year ago, everyone doubted Meta's position in the AI race In an interview I did with him, he admitted where they missed the mark: "Llama 4 was not on the trajectory that I thought it needed to be on. It was in many ways a big improvement over Llama 3, but we weren't trying to be a bit better than Llama 3. We're a frontier lab. It wants to be doing leading work." So he blew it up and rebuilt: "I felt like I'd learned enough about how to set up a lab that I wanted to reformulate the work we were doing." His conviction behind the rebuild: "AI is gonna be the most important technology in our lives, in our lifetimes. Building the capacity to build absolutely leading models is gonna be really critical for unlocking creativity." Video Mark Zuckerberg (@finkd) Today we're also opening the weights for Muse Glimmer, a great 30B parameter dense model that can run locally. Soon we'll also release the weights for Muse Spark 1.2, our latest foundation model. Meta is a strong supporter of open source and I'm proud of these releases. Congrats to @alexandr_wang and the MSL team for all your great work on these models. — https://nitter.net/finkd/status/2086755195535413696#m
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