Kimi K3 vs GLM 5.3 Prime
Kimi K3 vs GLM 5.3 Prime: which AI model is cheaper, has the larger context window and more capabilities? Side-by-side comparison updated daily.
Quick verdict
- GLM 5.3 Prime is 1.4× cheaper than Kimi K3 for the same mix of input and output tokens.
- Kimi K3 has the larger context window (1M), useful for long documents and big codebases.
- GLM 5.3 Prime is the more recent release (Sep 23, 2026).
- Only Kimi K3 has openly published weights you can run yourself.
- Only Kimi K3 accepts images as input.
- Choose GLM 5.3 Prime if cost matters most; choose Kimi K3 if you need its specific strengths above. For the best results, test both on your own prompts.
| Kimi K3 | GLM 5.3 Prime | |
|---|---|---|
| Company | Moonshot AI | Z.ai (Zhipu) |
| Released | Jul 16, 2026 | Sep 23, 2026 ● |
| Overall index | 157.7 | — |
| GPQA Diamond | 93.1% | — |
| AIME math | 97.2% | — |
| FrontierMath | 72.2% | — |
| SimpleQA Verified | 50.6% | — |
| Input (per 1M tokens) | $3 | $2.80 ● |
| Output (per 1M tokens) | $15 | $8.80 ● |
| Cost for 1M input + 1M output tokens | $18.00 | $11.60 ● |
| Providers | 22 ● | 1 |
| Context | 1M ● | 1M |
| Max output | 944K ● | 128K |
| Inputs | Text, Image, Video ● | Text |
| Outputs | Text | Text |
| Reasoning | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Open weights | ✓ | — |