Meta's rapid Muse Spark iteration—four versions from April through Muse Spark 1.3 on September 2, 2026—has shaped trader views on the 1.4+ release, with the model gaining ground on rivals like GPT-6 Astra and Claude Opus 5 in agentic coding, 1M-context multimodal tasks, and benchmarks such as Artificial Analysis Intelligence Index. The October 12 launch of the higher-tier Muse Wonder model introduced competitive positioning shifts and a new pricing/API tier, potentially delaying or redirecting resources from the Spark lineage. Markets currently price low odds for a release by late October, implying December timing amid Meta Superintelligence Labs' roadmap for larger models and selective open-weight plans. Key upcoming catalysts include any Meta AI announcements or developer conference updates that could clarify timelines or feature thresholds for resolution.