Alex Getmanearly AI signals

Muse Spark Open

Meta

Released Updated
Context window
1M
1,048,576 tokens
Input / Output
audio, image, text, video → text

Timeline

  1. · Open weights · evidence link
  2. · API availability · evidence link
  1. · Confirmed use · Meta · Research articles · Introducing Muse Spark Open, The Most Capable US Open‑Weight Model to Date

Signals 1

Specifications

Muse Spark Open is a model from Meta with open weights, released on 15 Oct 2026. The context window is 1,048,576 tokens.

Context window
1,048,576
Input
audio · image · text · video
Output
text
Weights
Open

Questions

What is the context window of Muse Spark Open?

The context window is 1,048,576 tokens.

Are the weights of Muse Spark Open publicly available?

Yes. Meta publishes the weights.

When was Muse Spark Open released?

On 15 Oct 2026.