Muse Spark Open
Muse Spark Open is a coding-optimized, open-weight model from Meta designed for agentic coding workflows. It supports reasoning and tool calling, accepts text, images, video, files and audio, and has a 1,048,576-token context window.
Muse Spark Open specs and pricing
- Provider: Meta
- Released: October 15, 2026
- Context window: 1M tokens
- Max output: 131K tokens
- Input: text, images, video, files, audio
- Output: text
- Price: $1.25 input / $4.25 output per 1M tokens
- Reasoning: yes
- Tool calling: yes
What Muse Spark Open is good at
- Agentic coding workflows
- Understanding codebases
- Tasks involving mixed input types
To-dos to try with Muse Spark Open
- Inspect this repository and explain how its main components fit together.
- Find the cause of this bug in the codebase and suggest a fix.
- Summarize this audio recording in text.
FAQ
- Who makes Muse Spark Open? Muse Spark Open is made by Meta.
- Can Muse Spark Open read images? Yes. It accepts images, along with text, video, files and audio, and produces text output.
- How much does Muse Spark Open cost? Muse Spark Open costs $1.25 per million input tokens and $4.25 per million output tokens through OpenRouter. In todo.is a typical agent step costs about 4.1 credits ($1 = 100 credits).
- What is the context window of Muse Spark Open? Muse Spark Open can read up to 1M tokens at once and write up to 131K tokens in one reply.
- Can I use Muse Spark Open without coding? Yes. In todo.is you pick Muse Spark Open as your agent's model and write to-dos in plain words, on the web, the Android app, WhatsApp or Telegram. No API key needed: credits are included, or you can bring your own key.
JavaScript is required to use the todo.is app.