Major Release OpenAI · Released
GPT-5.5 Instant
What is GPT-5.5 Instant?
GPT-5.5 Instant is a Major Release AI model from OpenAI, released on May 5, 2026. It has a 400K tokens context window, costs $5.00 per million input tokens, and scores 1474 on Chatbot Arena Elo. It is available via the company's API.
OpenAI GPT-5.5 Instant — AA Intelligence Index 41.8, 400K tokens context, reasoning model.
How much does GPT-5.5 Instant 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 Instant have?
- Context window
- 400K tokens
- Max output
- 128K
- Input modalities
- text, image
- Output modalities
- text
How does GPT-5.5 Instant score on benchmarks?
| Benchmark | Score |
|---|---|
| GPQA Diamond | 84.6% |
| HLE | 20.3% |
| SciCode | 50.3% |
| TAU2-bench | 49.4% |
| TerminalBench-Hard | 42.4% |
| IF-Bench | 71.5% |
| LiveCodeBench Reasoning | 55.7% |
| AA Intelligence Index | 41.8 |
| Chatbot Arena Elo | 1474 |
Benchmark scores verified .