GPT-5.5 Pro
active Active
GPT-5.5 Pro is an active OpenAI LLM API model. As of May 24, 2026 it has no announced deprecation or retirement date.
Lifecycle & specs
- Provider
- OpenAI
- API model ID
gpt-5.5-pro- Status
- active
- Released
- Apr 24, 2026
- Context window
- 1,050,000 tokens
- Input price
- $30.00 / 1M tokens
- Output price
- $180.00 / 1M tokens
- Knowledge cutoff
- 2025-12-01
- Pricing checked
- May 22, 2026
Source: official OpenAI documentation ↗ · pending verification