Zuckerberg’s Muse Code Loses to Anthropic on Meta’s Own Benchmark Charts

Mark Zuckerberg launched Muse Code in beta on Wednesday, Meta’s first artificial intelligence (AI) coding agent. Anthropic’s Claude Opus 5 beats it in all four comparisons Meta published at launch. Meta released those charts anyway.

The company is selling a cheaper tool rather than a better one. Independent test data suggests the gap is wider than Meta showed. Releasing Muse Code in beta today.

It's a terminal coding agent that takes on complete software engineering tasks across large repos: planning changes, writing code, validating the results. Powered by Muse Spark 1.2, a coding-focused model update.

pic.twitter.com/xqavk41w6v— Mark Zuckerberg (@finkd) August 5, 2026 Follow us on X to get the latest news as it happens Meta’s Own Charts Hand Anthropic Every Round Muse Spark 1.2 is the model inside Muse Code. It scored 82.9% on Terminal-Bench 2.1.