Meta Muse Spark 1.3 Goes Live With Fewer Tool Calls and Longer-Horizon AI

Meta announced Muse Spark 1.3 on September 2, 2026. The model is rolling out in Muse Code and the Meta Model API, with coding and agentic improvements aimed at longer tasks. Meta reports about 20% fewer tool calls and about 25% fewer tokens than Muse Spark 1.2 on its coding tests. The announcement lists Muse Spark 1.3 for macOS and Linux. Max reasoning is scheduled to follow additional safety testing, and Meta's announcement points to a future Muse Spark open-weights release. 1 Techmeme reported that the release keeps the same price as Spark 1.2. 2

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