GPT-4o vs GLM-5.3
30-second takeaway
- GLM-5.3 has the cheaper input: $1.1 vs $2.5 (per 1M tokens, 56% less)
- GLM-5.3 has the larger context: 1M vs 128K tokens
More specs (max output / capabilities)
| max output | 16,384 | 131,072 |
| Reasoning | — No | ✓ Yes |
| Tool calls | ✓ Yes | ✓ Yes |
| Open weights | — No | ✓ Yes |
Prices are official/data-source rates (per 1M tokens), not what relays actually charge — relay prices vary with discounts and group multipliers. See methodology.