Hardest reasoning tasks
Choose Claude Haiku 5.5
Claude Haiku 5.5 scores 43.4 on the Artificial Analysis Intelligence Index, against 38.9 for Muse Spark Open.
Claude Haiku 5.5 vs Muse Spark Open: price, context and capabilities
Choose Claude Haiku 5.5 for the hardest reasoning tasks, reasoning over long documents and images as input. Choose Muse Spark Open for self-hosting and data control.
In short
- A price comparison is not possible: one of them has no comparable published price.
- Only Claude Haiku 5.5 offers vision, structured output, prompt caching, batch api.
- Only Muse Spark Open offers self-hostable.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Reasoning over long documents
Choose Claude Haiku 5.5
Claude Haiku 5.5 scores 82.7% on Long-context reasoning (AA-LCR), against 78.3% for Muse Spark Open.
Self-hosting and data control
Choose Muse Spark Open
Muse Spark Open has open weights, so you can run it on your own servers; Claude Haiku 5.5 is only available through its provider.
Images as input
Choose Claude Haiku 5.5
Claude Haiku 5.5 accepts images as input; Muse Spark Open does not.
Specifications side by side
| Claude Haiku 5.5 | Muse Spark Open | |
|---|---|---|
| Provider | Anthropic | Meta |
| Category | Language models | Language models |
| Status | Generally available | Generally available |
| Headline price | $0.20 / 1M tokens | No data |
| Input | $0.10 / 1M tokens | No data |
| Output | $0.50 / 1M tokens | No data |
| Cached input | $0.01 / 1M tokens | No data |
| Context window | 1M | No data |
| Max output | 128k | No data |
| Released | October 2026 | Oct 15, 2026 |
| Knowledge cutoff | June 2026 | No data |
| Licence | Proprietary | Open weights |
| Capabilities | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API | Reasoning, Tool calling, Self-hostable |
| API model id | claude-haiku-5-5 |
Benchmarks side by side
Leader in bold.
| Benchmark | Claude Haiku 5.5 | Muse Spark Open |
|---|---|---|
| Intelligence Index | 43.4 | 38.9 |
| SciCode | 55% | 58.4% |
| Humanity's Last Exam | 44.4% | 43.9% |
| Long-context reasoning (AA-LCR) | 82.7% | 78.3% |
| GPQA Diamond | No data | 89% |
| MMMU-Pro (visual reasoning) | No data | 80.9% |
Independent evaluations by Artificial Analysis, run the same way for every model, at the reasoning setting shown. Percentages unless marked as an index.
Frequently asked questions
Should I choose Claude Haiku 5.5 or Muse Spark Open?
Choose Claude Haiku 5.5 for the hardest reasoning tasks, reasoning over long documents and images as input. Choose Muse Spark Open for self-hosting and data control.
Which is cheaper, Claude Haiku 5.5 or Muse Spark Open?
A price comparison is not possible: one of them has no comparable published price.
What is the difference between Claude Haiku 5.5 and Muse Spark Open?
Claude Haiku 5.5 is made by Anthropic and Muse Spark Open by Meta. A price comparison is not possible: one of them has no comparable published price. Only Claude Haiku 5.5 offers vision, structured output, prompt caching, batch api. Only Muse Spark Open offers self-hostable.