Higher-compute GPT-5.5 for hard problems; Responses API only.
Released
Apr 23, 2026
Context window
1.1M tokens
Max output
128K tokens
Parameters
Not disclosed
Input price
$30.00 per 1M
Output price
$180.00 per 1M
Prices are first-party list prices in USD at the standard tier. Last verified Oct 30, 2026.
Pricing
Launch priceApr 24, 2026
$30.00 in / $180.00 out
Current price
since Apr 24, 2026
$30.00 in / $180.00 out
Specifications
- Developer
- OpenAI
- Model type
- Multimodal
- Architecture
- Not disclosed
- Parameters
- Not disclosed
- Input
- Text Image
- Output
- Text
- Knowledge cutoff
- Dec 2025
- License
- Proprietary
- API access
- First-party API
- Capabilities
- Flagship Long context Reasoning Vision