GPT 5.5 (Fast) vs GPT-5.3 Chat
GPT-5.3 Chat is cheaper on output tokens, while GPT 5.5 (Fast) offers a larger context window. Choose GPT 5.5 (Fast) or GPT-5.3 Chat based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | GPT 5.5 (Fast) | GPT-5.3 Chat |
|---|---|---|
| Provider | Vercel AI Gateway | Vercel AI Gateway |
| Input / 1M tokens | $12.50 | $1.75 |
| Output / 1M tokens | $75.00 | $14.00 |
| Context window | 1M | 128K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Apr 2026 | Mar 2026 |
FAQ
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.