Muse Spark Open API: Pricing and Specs

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.

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"
  }'

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