Claude Haiku 5.5 vs Muse Spark 1.3 Contributor
Pricing, context window and real answers (October 2026)
Claude Haiku 5.5 (Anthropic) 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
 Claude Haiku 5.5 |  Muse Spark 1.3 Contributor | |
|---|---|---|
| Provider | Anthropic | Meta |
| Input (per 1M tokens) | $0.1055 | $0.11 |
| Output (per 1M tokens) | $0.5275 | $0.22 |
| Typical cost (1,000 in + 500 out tokens × 1,000 calls) | $0.3693 | $0.22 |
| Context window | 1,000,000 tokens | 1,048,576 tokens |
| Release date | 10/7/2026 | 9/2/2026 |
| Input modalities | text, image, file | 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 2026-10-02; 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, 58% less than Claude Haiku 5.5.
- For long documents, Muse Spark 1.3 Contributor: a 1,048,576-token context window against 1,000,000 for Claude Haiku 5.5.
- 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, Claude Haiku 5.5 or Muse Spark 1.3 Contributor?
- Per 1M output tokens, Claude Haiku 5.5 is $0.5275 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 Claude Haiku 5.5 and Muse Spark 1.3 Contributor compare?
- Claude Haiku 5.5 takes 1,000,000 tokens; Muse Spark 1.3 Contributor takes 1,048,576.
- Can I use Claude Haiku 5.5 and Muse Spark 1.3 Contributor with the same API key?
- Yes. On FastMetal's OpenAI-compatible endpoint, switch by passing "anthropic-claude-haiku-5-5" 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 Claude Haiku 5.5 and Muse Spark 1.3 Contributor from the browser chat and the API. No monthly fee.
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