Meta: Muse Spark Open
Muse Spark Open is a reasoning model from Meta released on Oct 15, 2026. It reads text, images, files, audio and video and writes text, with a 1.05M token context window and up to 944K tokens per reply.
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It costs $1.25 per million input tokens and $4.25 per million output tokens. Cached input bills at $0.15, 88% less than fresh input.
It supports tool calling, structured JSON output and prompt caching.
- Modalities
- In / out price
- $1.25 / $4.25 per 1M
- Context
- 1.05M
- Max output
- 944K
- Released
- Oct 15, 2026
- Knowledge cutoff
- n/a
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
Muse Spark Open pricing
USD, as listed on Oct 15, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $1.25 / 1M tokens | |
|---|---|---|
| Output | $4.25 / 1M tokens | |
| Cached input (read) | $0.15 / 1M tokens | 88% off input |
What Muse Spark Open costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call Muse Spark Open through an OpenAI compatible API.
- Tools
tools - Structured outputs
structured_outputs - Reasoning
reasoning - Temperature
temperature
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More from Meta
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Muse Spark Open questions
How much does the Muse Spark Open API cost?
$1.25 per million input tokens and $4.25 per million output tokens, with cached input at $0.15. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of Muse Spark Open?
1,048,576 tokens of input, and it can write up to 943,718 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Does Muse Spark Open support tool calling?
Yes. It accepts tool definitions and can return JSON that matches a schema, which is what an agent needs to call your APIs.
Is Muse Spark Open open source?
No. Meta serves it through an API only, so you cannot download the weights or host it yourself.
When was Muse Spark Open released?
Oct 15, 2026.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. The summary is written from these facts.