Muse Spark 1.3

meta/muse-spark-1.3

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, file input
Takes: Text, image, pdf
Returns: Text
Zero data retention: Yes, on every provider
No training on requests: Yes, on every provider
Released: 2026-09-02

Description

Muse Spark 1.3 is Meta’s multimodal reasoning model for long-horizon agentic and coding workflows. With a 1M-token context window, reliable tool calling, higher first-attempt accuracy, and native understanding of video, images, and documents, it helps developers build capable coding agents and AI development workflows with fewer unnecessary turns and cleaner 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-1.3",
    "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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