Beam 1.0 501B A23B vs Muse Spark 1.3 Contributor
Pricing, context window and real answers (October 2026)
Beam 1.0 501B A23B (Reflection AI) 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
| Beam 1.0 501B A23B |  Muse Spark 1.3 Contributor | |
|---|---|---|
| Provider | Reflection AI | Meta |
| Input (per 1M tokens) | $0.422 | $0.11 |
| Output (per 1M tokens) | $1.27 | $0.22 |
| Typical cost (1,000 in + 500 out tokens × 1,000 calls) | $1.06 | $0.22 |
| Context window | 1,048,576 tokens | 1,048,576 tokens |
| Release date | 10/16/2026 | 9/2/2026 |
| Input modalities | text | text, image, video, file, audio |
| Throughput (p50) | — | — |
| Arena · overall | Unranked | Unranked |
| Arena · Japanese | Unranked | Unranked |
| Arena · coding | Unranked | Unranked |
Prices are FastMetal's rates, before tax.
Rankings: LMArena leaderboard dataset (lmarena-ai/leaderboard-dataset), CC BY 4.0, snapshot 2026-10-15; category names mapped and ratings rounded by FastMetal.
Which should you pick?
- On price, Muse Spark 1.3 Contributor: $0.22 per 1M output tokens, 83% less than Beam 1.0 501B A23B.
- 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, Beam 1.0 501B A23B or Muse Spark 1.3 Contributor?
- Per 1M output tokens, Beam 1.0 501B A23B is $1.27 and Muse Spark 1.3 Contributor is $0.22 on FastMetal (US dollars, before tax), so Muse Spark 1.3 Contributor is cheaper.
- How do the context windows of Beam 1.0 501B A23B and Muse Spark 1.3 Contributor compare?
- Beam 1.0 501B A23B takes 1,048,576 tokens; Muse Spark 1.3 Contributor takes 1,048,576.
- Can I use Beam 1.0 501B A23B and Muse Spark 1.3 Contributor with the same API key?
- Yes. On FastMetal's OpenAI-compatible endpoint, switch by passing "beam-1.0" 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 Beam 1.0 501B A23B and Muse Spark 1.3 Contributor from the browser chat and the API. No monthly fee.
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