GLM 5.3 Prime vs GLM 5.3 Flash
GLM 5.3 Prime vs GLM 5.3 Flash: which AI model is cheaper, has the larger context window and more capabilities? Side-by-side comparison updated daily.
Quick verdict
- GLM 5.3 Flash is 18× cheaper than GLM 5.3 Prime for the same mix of input and output tokens.
- GLM 5.3 Flash 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 GLM 5.3 Flash has openly published weights you can run yourself.
- Only GLM 5.3 Flash accepts images as input.
- Choose GLM 5.3 Flash if cost matters most; choose GLM 5.3 Prime if you need its specific strengths above. For the best results, test both on your own prompts.
| GLM 5.3 Prime | GLM 5.3 Flash | |
|---|---|---|
| Company | Z.ai (Zhipu) | Z.ai (Zhipu) |
| Released | Sep 23, 2026 ● | Aug 26, 2026 |
| Overall index | — | 151.9 |
| GPQA Diamond | — | 90.2% |
| AIME math | — | 93.9% |
| FrontierMath | — | 55.8% |
| Input (per 1M tokens) | $2.80 | $0.15 ● |
| Output (per 1M tokens) | $8.80 | $0.50 ● |
| Cost for 1M input + 1M output tokens | $11.60 | $0.65 ● |
| Providers | 1 | 33 ● |
| Context | 1M | 1M ● |
| Max output | 128K | 944K ● |
| Inputs | Text | Text, Image, Video ● |
| Outputs | Text | Text |
| Reasoning | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Open weights | — | ✓ |