GLM-5.3 vs GLM-5.3-Flash
⚖ GLM-5.3 wins 2 of 4 categories, but GLM-5.3-Flash is 9.1× cheaper for everyday text work. Pick GLM-5.3 when quality matters most, GLM-5.3-Flash at volume.
Scores by category
| Category | GLM-5.3 | GLM-5.3-Flash |
|---|---|---|
| Overall | 61 | 55 |
| Writing | 70 | 64 |
| Support | 67 | 67 |
| Coding | 68 | 69 |
Provisional scores, 0 to 100 among the models we track, from Arena and Epoch AI. Value weighs the overall score against cost.
Price and specs
| GLM-5.3 | GLM-5.3-Flash | |
|---|---|---|
| Vendor | Z.ai | Z.ai |
| Released | 2026-08-14 | 2026-08-26 |
| Context window | 1M | 1M |
| Open weights | Yes | Yes |
| Input per 1M tokens | $1.40 | $0.15 |
| Output per 1M tokens | $4.40 | $0.50 |
| Per 1,000 tasks | $4.30 | $0.48 |