cd /news/artificial-intelligence/introducing-muse-glimmer · home topics artificial-intelligence article
[ARTICLE · art-91224] src=simonwillison.net ↗ pub= topic=artificial-intelligence verified=true sentiment=↑ positive

Introducing Muse Glimmer

Meta released Muse Glimmer, a new local large language model optimized for end-to-end agentic task completion, reliable tool use, and multi-step reasoning, achieving strong success rates on benchmarks including DeepSearch QA, MCP-Atlas, τ-Bench, and SWE-Bench. Simon Willison tested the 18.16 GB version via LM Studio and his llm-coding-agent plugin, noting the model's suitability for machines with 32 GB or more RAM.

read1 min views1 publishedAug 10, 2026

They claim to have optimized it for exactly the kind of things I'm looking for in a local model:

End-to-end Agentic Task Completion.Muse Glimmer achieves strong success rates on full-task benchmarks including DeepSearch QA, MCP-Atlas, 𝛕-Bench and SWE-Bench, which measure its ability to work within scaffolds, write and debug code, and resolve multi-turn requests from start to finish.Reliable Tool Use.The model handles a wide range of function calls, invoking tools with precise schemas throughout extended workflows.Multi-Step Reasoning.Muse Glimmer chains reasoning over long horizons, sustaining coherent plans across complex, extended workflows. [...]

Here's [a pelican](https://gist.github.com/simonw/f20d4cd0ea7596990f7910ead616493e) which I generated using LM Studio's [18.16 GB version of the model](https://lmstudio.ai/models/muse-glimmer):

I also tried it out with my [llm-coding-agent](https://github.com/simonw/llm-coding-agent) plugin, running against a fresh checkout of Datasette with the prompt:

how does auth work?

Here's the response, at the end of a long transcript showing all of the tool calls it made to explore the codebase.

I really like this size of model, because if a machine has 32 GB of RAM or more (mine has 128GB) it leaves plenty of space for running other applications at the same time.

Via [Hacker News](https://news.ycombinator.com/item?id=49241679)

Tags: [ai](https://simonwillison.net/tags/ai), [generative-ai](https://simonwillison.net/tags/generative-ai), [llama](https://simonwillison.net/tags/llama), [local-llms](https://simonwillison.net/tags/local-llms), [llms](https://simonwillison.net/tags/llms), [meta](https://simonwillison.net/tags/meta), [llm-release](https://simonwillison.net/tags/llm-release)
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