I am kind of becoming a Meta fanboy. No marketing fluff No unnecessary drama Only shipping! Muse Spark 1.3 is beating GPT 5.6 and Opus 5 at their own game. → DeepSWE v1.1: 75.4, beats GPT 5.6 Sol (73.0) and Opus 5 (74.0) → Codebase understanding (SWEAtlas): 59.4, clears both by 6+ points → Terminal coding (Terminal-Bench 2.1): 88.8, ties GPT, beats Opus's 86 I didn’t see that coming.

Mark Zuckerberg@finkdSep 2

Muse Spark 1.3 is rolling out today with frontier performance almost too cheap to meter. This is the biggest jump we've made so far on coding and agentic work. Try it in Muse Code and our API. Next up 🍉 and Muse Spark open weights releases coming soon.