Inkling vs Muse Spark 1.3 Contributor
Pricing, context window and real answers (September 2026)
Inkling (Thinking Machines) and Muse Spark 1.3 Contributor (Meta), 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
| Inkling |  Muse Spark 1.3 Contributor | |
|---|---|---|
| Provider | Thinking Machines | Meta |
| Input (per 1M tokens) | ¥178.7 | ¥17.59 |
| Output (per 1M tokens) | ¥723.74 | ¥35.18 |
| Typical cost (1,000 in + 500 out tokens × 1,000 calls) | ¥541 | ¥35 |
| Context window | 524,288 tokens | 1,048,576 tokens |
| Release date | 7/17/2026 | 9/2/2026 |
| Input modalities | text, image, audio | text, image, video, file, audio |
| Throughput (p50) | — | — |
| Arena · overall | #85 · ELO 1,440 | Unranked |
| Arena · Japanese | #63 · ELO 1,415 | Unranked |
| Arena · coding | #78 · ELO 1,492 | 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, 95% less than Inkling.
- For long documents, Muse Spark 1.3 Contributor: a 1,048,576-token context window against 524,288 for Inkling.
- 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, Inkling or Muse Spark 1.3 Contributor?
- Per 1M output tokens, Inkling is ¥723.74 and Muse Spark 1.3 Contributor is ¥35.18 on FastMetal (yen, before tax), so Muse Spark 1.3 Contributor is cheaper.
- How do the context windows of Inkling and Muse Spark 1.3 Contributor compare?
- Inkling takes 524,288 tokens; Muse Spark 1.3 Contributor takes 1,048,576.
- Can I use Inkling and Muse Spark 1.3 Contributor with the same API key?
- Yes. On FastMetal's OpenAI-compatible endpoint, switch by passing "inkling" or "muse-spark-1.3-contributor" 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 Inkling and Muse Spark 1.3 Contributor from the browser chat and the API. No monthly fee.
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