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Introducing Muse Glimmer

Introducing Muse Glimmer

Tech Simon Willison
Meta has released Muse Glimmer, a 30B open weights model designed specifically for agentic workflows and reliable tool use.
What: Muse Glimmer is an Apache 2.0 licensed model that performs multi-step reasoning and precise function calling, aimed at developers building autonomous agents that need to operate within IDEs and file systems.
Why it matters: The transition toward Apache 2.0 licensing suggests a strategic push by Meta to become the standard for local agentic infrastructure.
Takeaway: If you have 32GB+ of RAM, test Muse Glimmer with the `llm-lmstudio` plugin to evaluate its tool-calling reliability for your local coding tasks.
Deep dive
  • Model size: 30B parameters.
  • License: Apache 2.0.
  • Key focus: End-to-end task completion, multi-step reasoning, and tool use.
  • Benchmarked on SWE-Bench and MCP-Atlas for coding and debugging reliability.
  • Supports vision capabilities for image analysis within agent workflows.
  • Designed to fit on machines with 32GB of RAM to maintain system performance.
Decoder
  • Open weights: Models where the internal parameters are provided for download, often without the original training data or exact recipe.
  • Agentic workflow: An AI loop where a model iteratively plans, acts (using tools), and observes outcomes to reach a goal.
Original article

Introducing Muse Glimmer (via) Meta are back in the open weights game! Muse Glimmer is a brand new 30B model under a clean Apache 2.0 license (a step up from the janky Llama licenses of old).

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 which I generated using LM Studio's 18.16 GB version of the model:

All the pieces are there but they are pretty jumbled together.

I also tried it out with my 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 ran this using llm-lmstudio with this patch applied to upgrade it for compatibility with LLM 0.32.

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.

Glimmer is a vision model, so I asked it to describe this image:

llm -m lmstudio/meta/muse-glimmer -a https://static.inaturalist.org/photos/714731804/large.jpg 'describe image'

Two pelicans on some rocks

Here's what I got back:

The photograph shows a rocky, breakwater-style shoreline on an overcast day with a smooth, gray body of water and a faint dock/pier line in the soft-focused background.

In the foreground two large brown pelicans, Pelecanus occidentalis, are perched on the jumbled gray-white stones. They have the species’ characteristic long, down-curved yellow-orange bills with a large throat pouch, long slender necks and mottled brown-gray plumage on the back and wings. The pelican on the left is turned slightly toward the camera and appears to be preening or resting its bill against its chest; a pale, whitish patch is visible on the crown and nape and a small crest of feathers is raised. The pelican on the right faces mostly forward/right, its head up, bill pointing down and to the right, with the same pale head markings and the barred, darker wing feathers clearly visible.

Scattered among the rocks around the two pelicans are several much smaller dark birds — gulls/tern-like birds in muted brown-gray plumage. One dark bird sits on the far left on a rock, another brownish bird stands to the right of the right-hand pelican, a grayish bird with a reddish bill is in the lower right foreground, and a further small dark bird is at the extreme right edge of the frame.

The overall light is flat and diffused, giving the water and sky a muted, almost monochromatic palette that contrasts with the textured rock and the detailed feathering of the pelicans. The composition places the two big birds as the dominant subjects, framed against the calm water and the low, rocky perch.

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