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A side-by-side comparison of GLM 5.1 and GPT-5.5 Pro, using the lowest price and highest limits found across every provider that offers each model.
| GLM 5.1 | GPT-5.5 Pro | |
|---|---|---|
| Providers | 57 | 33 |
| Cheapest input ($/M) | $0.45 via Naga | $4.6472 via DaoXE |
| Cheapest output ($/M) | $1.45 via Naga | $27.8829 via DaoXE |
| Max context | 1M | 1.1M |
| Max output | 202.8K | 128K |
| Released | Mar 27, 2026 | Apr 22, 2026 |
| Open weights | Yes | No |
| Features | ReasoningToolsStructured outputTemperature | ReasoningToolsStructured outputFiles |
| Input modalities | Text | FileImageText |
| Output modalities | Text | Text |