> ## Documentation Index
> Fetch the complete documentation index at: https://docs.venice.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Muse Spark Open API

> Muse Spark Open API on Venice: 1M context, $1.56 input and $5.31 output per 1M tokens. Private, with zero data retention. Pricing, specs and code examples.

> [accordion] Plain-text specification
>
> ## Muse Spark Open API
>
> Muse Spark Open is a large language model by Meta, available on the Venice API as `muse-spark-open`. It runs privately, with zero data retention.
>
> Muse Spark Open is an open-weight reasoning model from Meta for coding and agentic workflows. It supports tool calling and native image understanding in a single checkpoint, using a sparse Mixture-of-Experts architecture with 816B total / 42B active parameters and a 1M-token context window.
>
> ### Muse Spark Open API pricing
>
> | Model ID | Variant | Privacy | Price |
> | - | - | - | - |
> | `muse-spark-open` | Standard | Private | $1.56 / $5.31 per 1M |
>
> ### Muse Spark Open specifications
>
> | Spec | Value |
> | - | - |
> | Provider | Meta |
> | Released | Oct 15, 2026 |
> | Privacy | Private |
> | Status | Stable |
> | Open weights | Yes |
> | Context window | 1M tokens |
> | Max output | 128K tokens |
> | Reasoning effort | low, medium, high, xhigh |
>
> ### How to use the Muse Spark Open API
>
> Send requests to `POST https://api.venice.ai/api/v1/chat/completions` with `"model": "muse-spark-open"` and your API key.
>
> ```bash theme={"system"}
> curl https://api.venice.ai/api/v1/chat/completions \
>   -H "Authorization: Bearer $VENICE_API_KEY" \
>   -H "Content-Type: application/json" \
>   -d '{
>     "model": "muse-spark-open",
>     "messages": [{ "role": "user", "content": "Explain TEE attestation in two sentences." }],
>     "reasoning_effort": "xhigh"
>   }'
> ```
>
> ### Related models
>
> * [DeepSeek V4 Pro 0813 API](https://docs.venice.ai/models/deepseek-v4-pro-0813.md): $1.65 / $4.95 per 1M
> * [GLM 5.3 API](https://docs.venice.ai/models/glm-5-3.md): $1.75 / $5.50 per 1M
> * [GPT-6.1 Terra API](https://docs.venice.ai/models/gpt-6-1-terra.md): $1.00 / $5.00 per 1M
> * [GLM 5.2 API](https://docs.venice.ai/models/glm-5-2.md): $1.40 / $4.40 per 1M


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