# Muse Spark Open

Muse Spark Open is Meta’s open-weight reasoning model for coding and agentic workflows. Its sparse mixture-of-experts architecture has 816 billion total parameters with approximately 42 billion active per token, combining code generation, tool use, and image understanding. A one-million-token context window supports repository analysis, multi-file changes, debugging, and long-running agent tasks.

- **Model ID:** `meta/muse-spark-open`
- **Type:** chat
- **Providers:** fireworks, baseten, togetherai, modal, nebius
- **Context window:** 1,048,576
- **Maximum output tokens:** 1,048,576
- **Pricing:** $1.25/1M input tokens, $4.25/1M output tokens
- **Canonical page:** https://vercel.com/ai-gateway/models/muse-spark-open

## Supported parameters

Detailed capability metadata has not been reported for this model.

## Example

```ts
import { streamText } from 'ai'

const result = streamText({
  model: 'meta/muse-spark-open',
  prompt: 'Why is the sky blue?'
})
```

## Links

- [Model page](https://vercel.com/ai-gateway/models/muse-spark-open)
- [AI Gateway documentation](https://vercel.com/docs/ai-gateway)
- [Provider model documentation](https://app.fireworks.ai/models/fireworks/muse-spark-open)
- [Provider pricing](https://api.fireworks.ai/v1/serverless/models)