Meta says Muse Spark 1.3 has frontier performance — but its best results come from a model developers can’t broadly use yet

Meta’s newest AI model Muse Spark 1.3, unveiled yesterday , is faster and more performant on third-party benchmarks than its predecessor — with a caveat. "Muse Spark 1.3 is rolling out today with frontier performance almost too cheap to meter," Meta co-founder and CEO Mark Zuckerberg wrote on X, calling it Meta’s “biggest jump” yet in coding and agentic work. There is substance behind both parts of that claim.