Summary
Meta made Muse Spark 1.3 available in Muse Code and the Meta Model API, describing improvements in long-horizon work, multitasking, constraint following and confirmation before consequential actions. Meta engineers reported approximately 20% fewer tool calls and 25% fewer tokens than Muse Spark 1.2 in coding comparisons, alongside stronger prompt-injection resistance.
Why it matters
The release directly changes coding-agent efficiency and operational safeguards. The performance figures are vendor-run comparisons rather than independent evaluations.
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