GLM 5.3 vs GPT-5.3 Chat
GLM 5.3 is cheaper on output tokens, while GLM 5.3 offers a larger context window. Choose GLM 5.3 or GPT-5.3 Chat based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | GLM 5.3 | GPT-5.3 Chat |
|---|---|---|
| Provider | Vercel AI Gateway | Vercel AI Gateway |
| Input / 1M tokens | $1.40 | $1.75 |
| Output / 1M tokens | $4.40 | $14.00 |
| Context window | 1M | 128K |
| Parameters | — | — |
| Open weights | Yes | No |
| Released | Aug 2026 | Mar 2026 |
FAQ
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.