GPT OSS 20B vs GPT 5.5 Pro
GPT OSS 20B is cheaper on output tokens, while GPT 5.5 Pro offers a larger context window. Choose GPT OSS 20B or GPT 5.5 Pro based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | GPT OSS 20B | GPT 5.5 Pro |
|---|---|---|
| Provider | Vercel AI Gateway | Vercel AI Gateway |
| Input / 1M tokens | $0.05 | $30.00 |
| Output / 1M tokens | $0.20 | $180.00 |
| Context window | 131K | 1M |
| Parameters | 21B | — |
| Open weights | Yes | No |
| Released | Aug 2025 | Apr 2026 |
FAQ
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.