Muse Spark 1.3 is Meta’s latest flagship for agentic work and coding. Same $1.25 / $4.25 API price as 1.2, with about 20% fewer tool calls and 25% fewer tokens on coding in Meta’s own comparisons. It leads DeepSWE v1.1 at 75.4 and ties Terminal-Bench 2.1 at 88.8. Live today in Muse Code and the Meta Model API. Max reasoning follows after safety testing.