Hardest reasoning tasks
Choose Muse Spark 1.3
Muse Spark 1.3 scores 48.1 on the Artificial Analysis Intelligence Index, against 39.6 for Muse Spark 1.2.
Muse Spark 1.2 vs Muse Spark 1.3: price, context and capabilities
Choose Muse Spark 1.3 for the hardest reasoning tasks, reasoning over long documents and the latest release; 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.
- Both accept 1.05M tokens per request.
- Muse Spark 1.3 is the newer model (Sep 2, 2026, against Aug 5, 2026).
- Only Muse Spark 1.3 offers reasoning.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Reasoning over long documents
Choose Muse Spark 1.3
Muse Spark 1.3 scores 83% on Long-context reasoning (AA-LCR), against 79% for Muse Spark 1.2.
Latest release
Choose Muse Spark 1.3
Muse Spark 1.3 is the newer release (Sep 2, 2026, against Aug 5, 2026 for Muse Spark 1.2).
Specifications side by side
| Muse Spark 1.2 | Muse Spark 1.3 | |
|---|---|---|
| Provider | Meta | Meta |
| Category | Language models | Language models |
| Status | Legacy | Generally available |
| Headline price | No data | No data |
| Input | No data | No data |
| Output | No data | No data |
| Cached input | No data | No data |
| Context window | 1.05M | 1.05M |
| Max output | No data | No data |
| Released | Aug 5, 2026 | Sep 2, 2026 |
| Knowledge cutoff | No data | No data |
| Licence | Proprietary | Proprietary |
| Capabilities | Tool calling | Reasoning, Tool calling |
| API model id | muse-spark-1.2 | muse-spark-1.3 |
Benchmarks side by side
Leader in bold.
| Benchmark | Muse Spark 1.2 | Muse Spark 1.3 |
|---|---|---|
| Intelligence Index | 39.6 | 48.1 |
| SciCode | 57.4% | 58.8% |
| GPQA Diamond | 90.4% | 93.5% |
| Humanity's Last Exam | 45.5% | 48.7% |
| Long-context reasoning (AA-LCR) | 79% | 83% |
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 Muse Spark 1.2 or Muse Spark 1.3?
Choose Muse Spark 1.3 for the hardest reasoning tasks, reasoning over long documents and the latest release; on the other points the two are level or the data is missing.
Which is cheaper, Muse Spark 1.2 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, Muse Spark 1.2 or Muse Spark 1.3?
Both accept 1.05M tokens per request.
What is the difference between Muse Spark 1.2 and Muse Spark 1.3?
Muse Spark 1.2 is made by Meta and Muse Spark 1.3 by Meta. A price comparison is not possible: one of them has no comparable published price. Both accept 1.05M tokens per request. Muse Spark 1.3 is the newer model (Sep 2, 2026, against Aug 5, 2026). Only Muse Spark 1.3 offers reasoning.
Which is newer, Muse Spark 1.2 or Muse Spark 1.3?
Muse Spark 1.3 was released on Sep 2, 2026 and Muse Spark 1.2 on Aug 5, 2026.