Muse Spark Open

meta/muse-spark-open

A chat model with a 1M-token context window, at $1.3125 per million input tokens and $4.4625 per million output tokens.

Details

Maker: meta
Kind: Chat
Context window: 1,048,576 tokens
Max output: 1,048,576 tokens
Input: $1.3125 per million tokens
Cached input: $0.1575 per million tokens, 88% off
Cache write: Same as input
Output: $4.4625 per million tokens
Capabilities: Reasoning, tool use, vision
Takes: Text, audio, image, video
Returns: Text
Zero data retention: Yes, on every provider
No training on requests: Yes, on every provider
Released: 2026-10-15

Description

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. This provider also documents audio and video input with text output.

Call it

curl

curl https://phantom.codes/v1/chat/completions \
  -H "Authorization: Bearer $PHANTOM_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "meta/muse-spark-open",
    "messages": [
      {"role": "user", "content": "Hello"}
    ]
  }'

Set PHANTOM_KEY to your key. Any OpenAI client works with the base URL https://phantom.codes/v1.

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