Z.ai: GLM 5.1 vs Z.ai: GLM 5.3 Flash
Z.ai: GLM 5.3 Flash is cheaper on output tokens, while Z.ai: GLM 5.3 Flash offers a larger context window. Choose Z.ai: GLM 5.1 or Z.ai: GLM 5.3 Flash based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Z.ai: GLM 5.1 | Z.ai: GLM 5.3 Flash |
|---|---|---|
| Provider | Z.ai | Z.ai |
| Input / 1M tokens | $1.33 | $0.15 |
| Output / 1M tokens | $4.18 | $0.50 |
| Context window | 205K | 1M |
| Parameters | 754B | — |
| Open weights | — | — |
| Released | Apr 2026 | — |
FAQ
Is Z.ai: GLM 5.1 or Z.ai: GLM 5.3 Flash cheaper?
Z.ai: GLM 5.3 Flash is cheaper on output tokens ($0.50 vs $4.18 per 1M).
Which has the larger context window, Z.ai: GLM 5.1 or Z.ai: GLM 5.3 Flash?
Z.ai: GLM 5.3 Flash has the larger context window (1M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.