Muse Spark 1.3

Meta shipped Muse Spark 1.3 on September 2, 2026, its biggest coding and agentic jump yet and, according to AI chief Alexandr Wang, a model that closes much of the gap with frontier releases like GPT-5.6. It cuts token usage by 25 percent and tool calls by 20 percent on comparable tasks, and holds the same $1.25 per million input and $4.25 per million output token pricing as its predecessor, plus a contributor tier at a steep discount for developers who let Meta train on their prompts and completions. Access starts through Muse Code and the Meta API, with a “max reasoning” variant still going through safety testing before release, and a rollout to Meta AI, Instagram, and Facebook planned to follow.