Hardest reasoning tasks
Choose Claude Opus 5.5
Claude Opus 5.5 scores 57.6 on the Artificial Analysis Intelligence Index, against 48.1 for Muse Spark 1.3.
Claude Opus 5.5 vs Muse Spark 1.3: price, context and capabilities
Choose Claude Opus 5.5 for the hardest reasoning tasks and images as input; on the other points the two are level or the data is missing.
In short
- A price comparison is not possible: one of them has no comparable published price.
- Muse Spark 1.3 reads more per request: 1.05M tokens against 1M.
- Only Claude Opus 5.5 offers vision, structured output, prompt caching, batch api.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Reasoning over long documents
Either one
They are practically level on Long-context reasoning (AA-LCR) (84.7% and 83%).
Images as input
Choose Claude Opus 5.5
Claude Opus 5.5 accepts images as input; Muse Spark 1.3 does not.
Specifications side by side
| Claude Opus 5.5 | Muse Spark 1.3 | |
|---|---|---|
| Provider | Anthropic | Meta |
| Category | Language models | Language models |
| Status | Generally available | Generally available |
| Headline price | $8.00 / 1M tokens | No data |
| Input | $4.00 / 1M tokens | No data |
| Output | $20.00 / 1M tokens | No data |
| Cached input | $0.20 / 1M tokens | No data |
| Context window | 1M | 1.05M |
| Max output | 128k | No data |
| Released | September 2026 | Sep 2, 2026 |
| Knowledge cutoff | June 2026 | No data |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API | Reasoning, Tool calling |
| API model id | claude-opus-5-5 | muse-spark-1.3 |
Benchmarks side by side
Leader in bold.
| Benchmark | Claude Opus 5.5 | Muse Spark 1.3 |
|---|---|---|
| Intelligence Index | 57.6 | 48.1 |
| SciCode | 66.9% | 58.8% |
| Humanity's Last Exam | 61.4% | 48.7% |
| Long-context reasoning (AA-LCR) | 84.7% | 83% |
| MMMU-Pro (visual reasoning) | 87.7% | No data |
| GPQA Diamond | No data | 93.5% |
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 Opus 5.5 or Muse Spark 1.3?
Choose Claude Opus 5.5 for the hardest reasoning tasks and images as input; on the other points the two are level or the data is missing.
Which is cheaper, Claude Opus 5.5 or Muse Spark 1.3?
A price comparison is not possible: one of them has no comparable published price.
Which has the larger context window, Claude Opus 5.5 or Muse Spark 1.3?
Muse Spark 1.3 reads more per request: 1.05M tokens against 1M.
What is the difference between Claude Opus 5.5 and Muse Spark 1.3?
Claude Opus 5.5 is made by Anthropic and Muse Spark 1.3 by Meta. A price comparison is not possible: one of them has no comparable published price. Muse Spark 1.3 reads more per request: 1.05M tokens against 1M. Only Claude Opus 5.5 offers vision, structured output, prompt caching, batch api.