Meta: Muse Glimmer
Muse Glimmer is a reasoning model from Meta released on Aug 10, 2026. It reads text and images and writes text, with a 128K token context window.
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Its weights are open, so you can host it yourself.
On the Artificial Analysis Intelligence Index it scores 17.5, which places it at number 30 among the 43 models I track with independent scores.
- Modalities
- In / out price
- n/a
- Context
- 128K
- Max output
- n/a
- Released
- Aug 10, 2026
- Knowledge cutoff
- n/a
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
Independent benchmarks
Measured by third parties, not reported by Meta. Each links to its source and shows the date I checked it.
A composite of 10 independent evaluations (agents 30%, coding 20%, scientific reasoning 20%, general 30%), run by Artificial Analysis on each model, version 4.3.2.
Artificial Analysis, checked Oct 10, 2026
Human preference: people compare two anonymous answers and pick the better one. Ratings from the Text Arena overall board, style control on.
Arena (formerly LMArena), checked Oct 10, 2026
Median output tokens per second measured by Artificial Analysis on the provider API, for the same model setting as its index score.
Artificial Analysis, checked Oct 10, 2026
More from Meta
- 1.05M context
Reads text, images, files, audio and video. Tool calling, structured output, reasoning. Served by 7 providers.
by metaOct 12, 2026$4/M input tokens$20/M output tokens7 providers
- Index 48.1
Reads text, images, files, audio and video. Tool calling, structured output, reasoning. Served by 13 providers.
by metaSep 2, 20261.05M context$1.25/M input tokens$4.25/M output tokens13 providers
- 1.05M context
Reads text, images, files, audio and video. Tool calling, structured output, reasoning. Served by 4 providers.
by metaSep 2, 2026$0.10/M input tokens$0.20/M output tokens4 providers
Muse Image 1.0
ImageGenerates images from text and images.
by metaAug 26, 2026
- 131K context
Reads text and images. Tool calling, structured output, reasoning. Served by 12 providers.
by metaAug 10, 2026$0.35/M input tokens$1.50/M output tokens12 providers
- 1.05M context
Reads text, images, files, audio and video. Tool calling, structured output, reasoning. Served by 15 providers.
by metaAug 5, 2026$1.25/M input tokens$4.25/M output tokens15 providers
Muse Glimmer questions
What is the context window of Muse Glimmer?
128,000 tokens of input. As a rough guide, a million tokens is around 750,000 English words.
Does Muse Glimmer support tool calling?
Not through the standard tools parameter. For an agent that calls your APIs, pick a model from the alternatives below that does.
Is Muse Glimmer open source?
Its weights are published, so you can run it on your own hardware or a cloud of your choice. Read the license before commercial use.
When was Muse Glimmer released?
Aug 10, 2026.
How good is Muse Glimmer compared with other models?
It scores 17.5 on the Artificial Analysis Intelligence Index and 1425 on the Arena text leaderboard. Benchmarks are a shortlist, not a verdict: test the top two or three candidates on your own tasks before you commit.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. Independent scores from my hand checked rankings, sources linked above. The summary is written from these facts.
Building on Muse Glimmer?
I test your real tasks on it and the two closest alternatives, then ship the agent on whichever wins on cost and accuracy.
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