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Muse Glimmer handles reliable tool use, invoking tools with precise schemas throughout extended workflows.

The model is credited with robust function-calling, handling a wide range of calls and precise schema invocation across long-running workflows. ✦ AI generated

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

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Reliable Tool Use. The model handles a wide range of function calls, invoking tools with precise schemas throughout 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 70%

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 65%