GLM-4.5-Flash vs GLM-5.1
GLM-4.5-Flash is cheaper on output tokens, while GLM-5.1 offers a larger context window. Choose GLM-4.5-Flash or GLM-5.1 based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | GLM-4.5-Flash | GLM-5.1 |
|---|---|---|
| Provider | Z.AI | Z.AI |
| Input / 1M tokens | $0.00 | $1.40 |
| Output / 1M tokens | $0.00 | $4.40 |
| Context window | 131K | 200K |
| Parameters | — | 754B |
| Open weights | Yes | Yes |
| Released | Jul 2025 | Apr 2026 |
FAQ
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.