Meta’s Muse Spark series has followed a recent ~4-week release cadence, with 1.3 launching September 2, 2026 after 1.2 in early August, emphasizing gains in agentic workflows, long-horizon coding, tool efficiency, and multimodal capabilities via Muse Code and the Meta Model API. However, the October 12, 2026 debut of the higher-tier Muse Wonder model appears to have redirected resources and attention away from the next Spark iteration (1.4+), contributing to market-implied odds that place only about 10% probability of release by October 31 and a median around January 2027. Traders are weighing Meta’s stated roadmap—including open-weights Spark releases and larger models—against the lack of recent 1.4-specific announcements or accelerated internal signals, while monitoring competitive benchmarks where Spark 1.3 trails some frontier alternatives.