GLM-5.1 vs Claude Sonnet 4
GLM-5.1 is cheaper on output tokens. Choose GLM-5.1 or Claude Sonnet 4 based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | GLM-5.1 | Claude Sonnet 4 |
|---|---|---|
| Provider | FastRouter | FastRouter |
| Input / 1M tokens | $1.05 | $3.00 |
| Output / 1M tokens | $3.50 | $15.00 |
| Context window | 200K | 200K |
| Parameters | 754B | — |
| Open weights | Yes | No |
| Released | Apr 2026 | May 2025 |
FAQ
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.