Major Release OpenAI · Released
GPT-5.5
What is GPT-5.5?
GPT-5.5 is a Major Release AI model from OpenAI, released on April 23, 2026. It has a 922K tokens context window, costs $5.00 per million input tokens, and scores 1475 on Chatbot Arena Elo. It is available via the company's API.
OpenAI GPT-5.5 — AA Intelligence Index 60.2, 922K tokens context, reasoning model.
How much does GPT-5.5 cost?
| Metric | Price |
|---|---|
| input per mtok | $5.00 |
| output per mtok | $30.00 |
| cache read per mtok | $0.50 |
Pricing data verified .
What context window does GPT-5.5 have?
- Context window
- 922K tokens
- Max output
- 128K
- Input modalities
- text, image
- Output modalities
- text
How does GPT-5.5 score on benchmarks?
| Benchmark | Score |
|---|---|
| GPQA Diamond | 93.5% |
| HLE | 44.3% |
| SciCode | 56.1% |
| TAU2-bench | 93.9% |
| TerminalBench-Hard | 60.6% |
| IF-Bench | 75.9% |
| LiveCodeBench Reasoning | 74.3% |
| AA Intelligence Index | 60.2 |
| Chatbot Arena Elo | 1475 |
Benchmark scores verified .