Model Library
OpenAIReleased April 23, 2026GPT-5.5 Pro (xhigh)
OpenAI · Released April 23, 2026
Intelligence score
—
At a glance
- Intelligence
- —
- Speed
- —
- Latency
- —
- Input price
- Not published
- Output price
- Not published
- Context window
- 920Ktokens
- Parameters
- —
Summary
Comparison summary
Analysis of OpenAI's GPT-5.5 Pro (xhigh) and comparison to other AI models across key metrics including quality, price, performance (tokens per second & time to first token), context window & more.
Specifications
Technical specifications
| Model name | GPT-5.5 Pro (xhigh) |
|---|---|
| Provider | OpenAI |
| Release date | April 23, 2026 |
| Intelligence score | — |
| Speed | — |
| Latency (TTFT) | — |
| Input price | Not published |
| Output price | Not published |
| Context window | 920,000 tokens |
| Parameters | — |
| Reasoning | Yes |
| Input modalities | text, image |
| Output modalities | — |
| Open weights | No |
| License | — |
| API availability | — |
| Source | Model Intelligence legacy profile: gpt-5-5-pro |
FAQ · 12
Frequently asked questions
GPT-5.5 Pro (xhigh) was released on April 23, 2026.
GPT-5.5 Pro (xhigh) was created by OpenAI.
Yes, GPT-5.5 Pro (xhigh) is a reasoning model. It uses extended thinking or chain-of-thought reasoning to work through complex problems before providing an answer.
GPT-5.5 Pro (xhigh) supports text and image input.
GPT-5.5 Pro (xhigh) supports text output.
Yes, GPT-5.5 Pro (xhigh) supports image input and can analyze, describe, and answer questions about images.
Yes, GPT-5.5 Pro (xhigh) is multimodal. It can process text and image input and generate text output.
GPT-5.5 Pro (xhigh) has a context window of 920k tokens. This determines how much text and conversation history the model can process in a single request.
No, GPT-5.5 Pro (xhigh) is proprietary. The model weights are not publicly available.
GPT-5.5 Pro (xhigh) is a proprietary model and OpenAI has not disclosed the model size or parameter count.
Check the providers page for current API availability.
Visit the providers page to see availability.