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. Recent Meta activity has not produced a new Muse Spark number. A research post dated November 6 describes specialized versions of existing models, trained using the Muse Wonder series, and rolling out to Muse and Meta AI users. Those are different names from Muse Spark, and the post as quoted does not describe a 1.4 or later model. The open-weight news does not change the picture either. A sceptic should still allow for a surprise. The evidence gathered here does not show a 1.4 or Muse Spark 2 announced or scheduled. The thing to watch is any official Meta post that names a Muse Spark 1.4 or Muse Spark 2 and makes it open to the general public, not just in private testing.