Muse Spark 1.1: Meta’s Agentic Model and API

Muse Spark 1.1: proprietary closed-weight model from Meta Superintelligence Labs, July 9 2026. Free in Thinking mode on meta.ai; paid API US public preview. Strengths in agentic tool use (JobBench, MCP Atlas); trails Opus 4.8 and GPT-5.5 on pure coding per third-party analysis. Strategic shift from Llama open-weight distribution.