Meta's Superintelligence Lab unveils its first public model, Muse Spark Meta touts strong benchmarks but admits "performance gaps" in agentic and coding systems. https://arstechnica.com/ai/2026/04/metas-superintelligence-lab-unveils-its-first-public-model-muse-spark/?utm_brand=arstechnica&utm_social-type=owned&utm_source=mastodon&utm_medium=social