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Muse Glimmer performs multi-step reasoning, chaining reasoning over long horizons and sustaining coherent plans across complex, extended workflows.

The model sustains multi-step reasoning, chaining coherent plans across complex, long-running workflows. ✦ AI generated

Simon Willison · Simon Willison's Weblog · 2026-08-10 · original ↗

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Multi-Step Reasoning. Muse Glimmer chains reasoning over long horizons, sustaining coherent plans across complex, extended workflows. [...]

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✳ Muse Glimmer

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Mechanism · 1

Muse Glimmer is optimized for end-to-end agentic task completion, achieving strong success rates on full-task benchmarks including DeepSearch QA, MCP-Atlas, τ-Bench and SWE-Bench.Simon Willison · Simon Willison's Weblog · conf 60%

Context · 1

Meta are back in the open weights game, releasing Muse Glimmer as a brand new 30B model under a clean Apache 2.0 license, which is a step up from the janky Llama licenses of old.Simon Willison · Simon Willison's Weblog · conf 60%