GPT-5.5 Pro vs o3 Pro
o3 Pro is cheaper on output tokens, while GPT-5.5 Pro offers a larger context window. Choose GPT-5.5 Pro or o3 Pro based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | GPT-5.5 Pro | o3 Pro |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Input / 1M tokens | $30.00 | $20.00 |
| Output / 1M tokens | $180.00 | $80.00 |
| Context window | 1.1M | 200K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Apr 2026 | Jun 2025 |
| Epoch Capabilities Index score | 162 | 147 |
FAQ
Is GPT-5.5 Pro or o3 Pro cheaper?
o3 Pro is cheaper on output tokens ($80.00 vs $180.00 per 1M).
Which has the larger context window, GPT-5.5 Pro or o3 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.