Meta enters the AI coding wars with Muse Spark 1.2 and Muse Code with persistent async background agents

Meta today released Muse Code , a terminal-based AI coding agent now in beta, alongside Muse Spark 1.2 , a coding-focused update to its Muse Spark family of frontier models — a one-two punch that puts the company in direct competition with Anthropic’s Claude Code, OpenAI’s Codex, and the growing field of agentic coding harnesses that have rapidly become the primary way many professional developers ship software. “Releasing Muse Code in beta today,” Meta co-founder and CEO Mark Zuckerberg wrote in a post on rival social network X (under his longtime handle @finkd). “It’s a terminal coding agent