Predecessor of GPT-5.5, but still very widely used ($2.50/$15 per MTok vs. $5/$30 for 5.5). Mini variant (400K context, $0.75/$4.50) for coding agents and subagents. IMOAnswerBench 91.4%.
At a glance
Context
1M tokens
Input
text, image, audio, code
Official benchmarks
| Benchmark | Score | Source |
|---|---|---|
| IMOAnswerBench | 91.4% | Source ↗ |
Only official figures with a source.
Specifications
- Status
- Released
- Date
- November 1, 2025
- Lab
- OpenAI
- Origin
- US
- Type
- reasoning, multimodal
- Open weights
- —
- License
- proprietary
- Context
- 1M tokens
- Input
- text, image, audio, code
- Output
- text, image, audio, code