Muse Spark 1.3

Agentic coding with 1M context, fewer tool calls

Try Muse Spark 1.3 in the Workbench

Run this model interactively, tune parameters, and compare outputs.

Model ID: muse-spark-1-3

Muse Spark 1.3 is Meta’s multimodal reasoning model for long-running agentic, multi-agent, and coding workflows. It can plan across tools, delegate work to parallel subagents, work with large codebases, and sustain longer-horizon tasks while juggling multiple workflows in a single extended thread.

Compared with earlier Muse Spark releases, it completes engineering tasks with fewer tool calls and fewer output tokens, takes fewer turns where they are not needed, and produces a cleaner coding style. Meta also reports stronger resistance to adversarial inputs and prompt injections. The model supports structured output, parallel tool calling, and visual understanding.

Metric	Value
Context Length	1,048,576 tokens
Max Output	131,072 tokens

Example request

Use the Workbench as a request builder: configure parameters for this model in the UI, then open the API tab to copy the exact cURL or Python call.

Minimal

cURL

curl -X POST https://hub.oxen.ai/api/ai/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $OXEN_API_KEY" \
  -d '{
  "model": "muse-spark-1-3",
  "messages": [
    {
      "role": "user",
      "content": "Hello, what can you do?"
    }
  ]
}'

Basic parameters

cURL

curl -X POST https://hub.oxen.ai/api/ai/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $OXEN_API_KEY" \
  -d '{
  "model": "muse-spark-1-3",
  "messages": [
    {
      "role": "user",
      "content": "Hello, what can you do?"
    }
  ],
  "temperature": 0.7,
  "max_tokens": 1024,
  "stream": false
}'

All parameters

cURL

curl -X POST https://hub.oxen.ai/api/ai/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $OXEN_API_KEY" \
  -d '{
  "model": "muse-spark-1-3",
  "messages": [
    {
      "role": "user",
      "content": "Hello, what can you do?"
    }
  ],
  "temperature": 0.7,
  "max_tokens": 1024,
  "stream": false,
  "top_p": 1.0
}'

Fetch model details

The models endpoint returns the full model object, including its json_request_schema.

curl -H "Authorization: Bearer $OXEN_API_KEY" https://hub.oxen.ai/api/ai/models/muse-spark-1-3

Request parameters

This model follows the standard OpenAI chat completions request body. See the chat completions reference for the full parameter list.