Meta Muse Spark 1.3 Multimodal Reasoning Evaluation Guide
A 2026 analyst review of Meta's Muse Spark 1.3 multimodal reasoning model, covering its September 2 launch, $1.25/$4.25 per-million-token API pricing, GDPVal-AA v2 and Terminal-Bench 2.1 benchmark scores, and how it compares with GPT-5.6 Sol and Claude Opus 5.