Muse Spark 1.3 vs Kimi K3
Muse Spark 1.3 vs Kimi K3: which AI model is cheaper, has the larger context window and more capabilities? Side-by-side comparison updated daily.
Quick verdict
- Muse Spark 1.3 is 3.0× cheaper than Kimi K3 for the same mix of input and output tokens.
- Both have the same context window.
- Muse Spark 1.3 is the more recent release (Sep 2, 2026).
- Only Kimi K3 has openly published weights you can run yourself.
- Choose Muse Spark 1.3 if cost matters most; choose Kimi K3 if you need its specific strengths above. For the best results, test both on your own prompts.
| Muse Spark 1.3 | Kimi K3 | |
|---|---|---|
| Company | Meta | Moonshot AI |
| Released | Sep 2, 2026 ● | Jul 16, 2026 |
| Overall index | 156.9 | 157.7 ● |
| GPQA Diamond | — | 93.1% |
| AIME math | 99.2% ● | 97.2% |
| FrontierMath | 74.4% ● | 72.2% |
| SimpleQA Verified | — | 50.6% |
| Input (per 1M tokens) | $1.25 ● | $3 |
| Output (per 1M tokens) | $4.25 ● | $15 |
| Cost for 1M input + 1M output tokens | $5.50 ● | $18.00 |
| Providers | 1 | 22 ● |
| Context | 1M | 1M |
| Max output | 944K | 944K |
| Inputs | Text, Image, Video, Files ● | Text, Image, Video |
| Outputs | Text | Text |
| Reasoning | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Open weights | — | ✓ |