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Muse Spark 1.2 is a coding-focused update with improvements in code generation, complex debugging, codebase understanding, and end-to-end developer workflows, achieved by scaling up training compute on coding tasks and expanding training environment diversity.

The author describes Muse Spark 1.2 as a coding-focused update that scales training compute on coding while maintaining strengths in general agents. ✦ AI generated

The author · Simon Willison's Weblog · 2026-08-05 · original ↗

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Muse Spark 1.2 is a coding-focused update to Muse Spark 1.1, with improvements in code generation, complex debugging, codebase understanding, and end-to-end developer workflows. In Muse Spark 1.2, we significantly scaled up training compute on coding tasks while expanding training environment diversity. The model also maintains its strength in other key areas like general agents.

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✳ Muse Spark

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