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Muse Spark Open

inworld/models/muse-spark-open

Muse Spark Open is a reasoning model by Meta with vision, function calling, prompt caching, structured output — designed for complex, multi-step problem solving where accuracy matters more than speed. It supports a 1M token context window with up to 131K tokens of output. Priced at $1.25 per million input tokens and $4.25 per million output tokens. Access Muse Spark Open through Inworld LLM Inference with OpenAI SDK compatibility, built-in failover, and intelligent routing across providers.

Input
$1.25
Output
$4.25
Cache read
$0.15
Context
1M
Max output
131.1K
TextImage→Text
Function CallingReasoningPrompt CachingStructured outputVision
Run on your server. Set INWORLD_API_KEY to your API key. Python requires pip install openai; JavaScript requires Node.js 18+; save it as example.mjs.
curl --fail-with-body https://api.inworld.ai/v1/chat/completions \
  -H "Authorization: Basic $INWORLD_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
    "model": "inworld/models/muse-spark-open",
    "messages": [{"role": "user", "content": "Hello"}],
    "stream": true
  }'
Model Muse Spark OpenOpenAI SDK compatible

Pricing and providers

Access Muse Spark Open through Inworld LLM Inference or speech to speech via Inworld. By using the providers below you agree to their terms, listed under each provider's name in the Legal section.

Modalities
InworldThis pageinworld/models/muse-spark-open
$1.25$4.25$0.15—1M131.1K
TextImage→Text
Prices in USD per 1M tokens.

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