GPT-5 Pro vs GPT-5.5 Pro
GPT-5 Pro is cheaper on output tokens, while GPT-5.5 Pro offers a larger context window. Choose GPT-5 Pro or GPT-5.5 Pro based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | GPT-5 Pro | GPT-5.5 Pro |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Input / 1M tokens | $15.00 | $30.00 |
| Output / 1M tokens | $120.00 | $180.00 |
| Context window | 400K | 1.1M |
| Parameters | — | — |
| Open weights | No | No |
| Released | Oct 2025 | Apr 2026 |
| LiveBench score | 71.3 | — |
| Epoch Capabilities Index score | 151 | 162 |
FAQ
Is GPT-5 Pro or GPT-5.5 Pro cheaper?
GPT-5 Pro is cheaper on output tokens ($120.00 vs $180.00 per 1M).
Which has the larger context window, GPT-5 Pro or GPT-5.5 Pro?
GPT-5.5 Pro has the larger context window (1.1M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.