Muse Spark 1.3 Contributor vs Pareto
Pricing, context window and real answers (September 2026)
Muse Spark 1.3 Contributor (Meta) and Pareto (Unbiased), compared as you can actually call them on FastMetal. Both are served from the same OpenAI-compatible endpoint and API key; switching is a change to the model string.
Specs and pricing
 Muse Spark 1.3 Contributor | Pareto | |
|---|---|---|
| Provider | Meta | Unbiased |
| Input (per 1M tokens) | ¥17.59 | ¥446.75 |
| Output (per 1M tokens) | ¥35.18 | ¥1,340.25 |
| Typical cost (1,000 in + 500 out tokens × 1,000 calls) | ¥35 | ¥1,117 |
| Context window | 1,048,576 tokens | 262,144 tokens |
| Release date | 9/2/2026 | 9/17/2026 |
| Input modalities | text, image, video, file, audio | text, image |
| Throughput (p50) | — | — |
| Arena · overall | Unranked | Unranked |
| Arena · Japanese | Unranked | Unranked |
| Arena · coding | Unranked | Unranked |
Prices are FastMetal's yen rates before tax. Arena ranks are as of the latest leaderboard scrape.
Which should you pick?
- On price, Muse Spark 1.3 Contributor: ¥35.18 per 1M output tokens, 97% less than Pareto.
- For long documents, Muse Spark 1.3 Contributor: a 1,048,576-token context window against 262,144 for Pareto.
- If in doubt, try both on the same key. Switching is a change to the model string, and each is billed at its own rate.
Frequently asked questions
- Which is cheaper, Muse Spark 1.3 Contributor or Pareto?
- Per 1M output tokens, Muse Spark 1.3 Contributor is ¥35.18 and Pareto is ¥1,340.25 on FastMetal (yen, before tax), so Muse Spark 1.3 Contributor is cheaper.
- How do the context windows of Muse Spark 1.3 Contributor and Pareto compare?
- Muse Spark 1.3 Contributor takes 1,048,576 tokens; Pareto takes 262,144.
- Can I use Muse Spark 1.3 Contributor and Pareto with the same API key?
- Yes. On FastMetal's OpenAI-compatible endpoint, switch by passing "muse-spark-1.3-contributor" or "pareto" as the model. Each is billed at its own rate from the same prepaid balance.
Try both on one API key
Create an account and add credit to call Muse Spark 1.3 Contributor and Pareto from the browser chat and the API. No monthly fee.
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