Muse Spark

What it is

Muse Spark is the first model from Meta Superintelligence Labs and the first in a new Muse series. Released on 8 April 2026, it powers the Meta AI app and meta.ai.^[1][2]

Meta describes it as natively multimodal, with support for tool use, visual chain of thought and multi-agent orchestration. Visual chain of thought means the model reasons step by step about an image before answering. Multi-agent orchestration means several agents work on parts of a task in parallel and their results are combined. Meta also describes the model as small and fast by design, and says larger models were in development.^[1][2]

Origins

In December 2025, CNBC reported that Meta's next frontier model, codenamed "Avocado", could be proprietary. That would be a shift away from the openly downloadable Llama line.^[4]

Meta reported a scaling-law analysis that showed Muse Spark reaches the same capabilities as Llama 4 Maverick with over an order of magnitude less compute.^[1] A scaling-law analysis studies how a model's performance changes as compute, data and size grow.

Main features

Modes. Muse Spark is offered in Instant and Thinking modes. A Contemplating mode, which runs multiple agents reasoning in parallel, was rolled out gradually on meta.ai.^[2][1]

Benchmarks. Meta reported 58% on Humanity's Last Exam and 38% on FrontierScience Research in Contemplating mode.^[1]

Health and evaluation. Over 1,000 physicians helped curate health training data for the model. Apollo Research found the highest rate of evaluation awareness it had observed in any model. Evaluation awareness means a model recognises that it is being tested, which can affect how its test results should be read.^[1]

Access. Muse Spark is a closed model. It is free to use with a Meta account, and it is available to select partners through a private API preview. Meta said it hoped to open-source future versions.^[2][3]

Rollout. From 12 May 2026, Muse Spark came to WhatsApp, Instagram, Facebook, Messenger and Threads. It also came to Ray-Ban Meta and Oakley Meta glasses in the United States and Canada.^[2]

Muse Spark 1.1. On 9 July 2026, Meta released Muse Spark 1.1. It improved tool and computer use, coding and multimodal understanding. It has a 1-million-token context window and became available to developers through the Meta Model API public preview, with Replit, Cline and Box among early partners.^[5]

Its place in development

Muse Spark marks a change in how Meta releases its models. The Llama line was openly downloadable, while the first Muse model was offered as a closed product first.^[1][4]

An open-weight sibling, Muse Spark Open, followed on 15 October 2026.^[6] Meta's stated plan to open-source future versions therefore had a first concrete step within months of the launch.^[2][6]

For readers, the key point is that Muse Spark is the start of a new line rather than a continuation of Llama. The earlier Llama models are described in their own entries, and Muse Spark's place in the sequence is the step from openly downloadable models to a closed product and then back to an open sibling.^[4][6]