GLM-5.1 vs GLM-4.5-Air
Both have similar output pricing, while GLM-5.1 offers a larger context window. Choose GLM-5.1 or GLM-4.5-Air based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | GLM-5.1 | GLM-4.5-Air |
|---|---|---|
| Provider | Z.AI Coding Plan | Z.AI Coding Plan |
| Input / 1M tokens | $0.00 | $0.00 |
| Output / 1M tokens | $0.00 | $0.00 |
| Context window | 200K | 131K |
| Parameters | 754B | — |
| Open weights | No | Yes |
| Released | Mar 2026 | Jul 2025 |
FAQ
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.