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Introducing Muse Spark 1.3
Official Meta AI Research blog: Muse Spark 1.3 rolls out in Muse Code and the Meta Model API; max reasoning gated pending more safety testing; 1M context; closed weights.
Meta released Muse Spark 1.3 in Muse Code and the Meta Model API. Max reasoning stays gated pending more safety testing. Meta says internal compares vs 1.2 showed about 20% fewer tool calls and 25% fewer tokens on agentic coding work. Context stays 1M tokens. Weights stay closed.

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Official Meta AI Research blog: Muse Spark 1.3 rolls out in Muse Code and the Meta Model API; max reasoning gated pending more safety testing; 1M context; closed weights.
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Secondary coverage of Meta's ~20% fewer tool calls and ~25% fewer tokens claim vs Muse Spark 1.2 on agentic coding work.