GPT-5.5 Pro
OpenAIProprietary1.05M context
GPT-5.5 Pro is a proprietary model from OpenAI with a 1.05M-token context window. 1 provider lists it, at $30.00 per million input tokens and $180.00 per million output tokens (OpenAI).
- Maker
- OpenAI
- Licence
- Proprietary
- Context window
- 1.05M
- Providers listed
- 1
- Lowest input, per 1M
- $30.00
- Lowest output, per 1M
- $180.00
- OpenAI's own API, per 1M
- $30.00 in · $180.00 out
- Effort settings
- Xhigh
Providers serving GPT-5.5 Pro
Cheapest first, by the blended rate of three input tokens to one output token. Prices in US dollars per million tokens, as of 26 Oct 2026.
| Provider | Input | Output | Context | Tools | JSON mode | OpenAI-compatible | Model ID |
|---|---|---|---|---|---|---|---|
OpenAI | $30.00 | $180.00 | 1.05M | Yes | Yes | Yes | gpt-5.5-pro |
Benchmark scores
Published scores only, each linked to its source. Compare every model in Bench rankings
| Benchmark | Xhigh |
|---|---|
Humanity's Last Exam Reasoning & knowledge | 43.1%v |