the chart
Meta

Muse Spark Open

meta/muse-spark-open

Holders first until 2026-10-22

about 0.3¢ a message

A typical message: about 500 tokens you send and 500 it writes.

$1.375 per 1M tokens you send$4.675 per 1M tokens it writesreads 1M tokens at once

Published capabilitiesreads imagestool callingjson schema
Chat with Muse Spark OpenCall it from codeLock this price

About

Muse Spark Open is a coding-optimized open-weight model. Trained specifically for agentic coding workflows, it delivers higher first-attempt accuracy, reliable tool calling, and deep codebase understanding across the repos developers...

In Meta's words.

Try it here

Whatever it says appears here.

Published facts

What the upstream's catalog says about this world, with its price as billed here.

Context window
1,048,576 tokens
Longest answer
943,718 tokens
Input, per 1M tokens
$1.375upstream $1.25
Output, per 1M tokens
$4.675upstream $4.25
Cached input, per 1M
$0.165upstream $0.15
Margin
+10%
Reads
text and images
First listed
2026-10-15

Speed and reliability measured on this gateway join these once this world has served requests through Antimatter.

Price and latency history as JSON: GET /api/planet/history?id=meta/muse-spark-open.

Call it

One OpenAI compatible endpoint, this model's id, and an am_live_ key from the dashboard. Or try it in chat first, no key needed.

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

Everything else is in the docs.

Embed this

A badge with this world's live price per million tokens, as billed here, for a README or a site. It links back to this page.

Muse Spark Open price on Antimatter
<a href="https://useantimatter.com/planet/meta/muse-spark-open"><img src="https://useantimatter.com/api/badge/price?id=meta%2Fmuse-spark-open" alt="Muse Spark Open price on Antimatter" height="28"></a>

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