Meta's Muse Spark 1.3, dated September 2, is the latest version in the evidence
A Meta page carries an entry headed "Introducing Muse Spark 1.3", dated September 2, 2026, and describes improved performance across agentic and coding tasks. That is the most recent numbered Muse Spark version in the material gathered, and 1.3 sits below the 1.4 threshold this question needs. The forecast leans toward no qualifying release by November 30.