Muse Spark is a large language model (LLM) developed by Meta through its Meta Superintelligence Labs (MSL). It was introduced in April 2026 and launched as Muse Spark 1.1 on July 9, 2026. It is the first model in Meta's Muse family and is designed for multimodal reasoning, coding, and AI-assisted software development. It also powers Meta AI across Meta's products and services. It can handle a million tokens of context.