What the evidence says
- Developer
- OpenAI
- Released
- April 23, 2026
- Domains
- Multimodal · Language · Vision
- Tasks
- Language modeling/generation · Question answering
- Access
- API access
- Weights
- Closed weights
Platform facts
OpenRouter's platform listing, retrieved July 22, 2026. Routed platform prices, not first-party provider prices.
- Input price
- $30.00 per 1M tokens
- Output price
- $180 per 1M tokens
- Context length
- 1,050,000 tokens
- Listed on OpenRouter
- April 24, 2026
Common questions
What is GPT-5.5 Pro?
GPT-5.5 Pro is a OpenAI model released April 23, 2026, according to Epoch AI's reviewed catalog record. The record classifies it under multimodal, language, vision.
How does GPT-5.5 Pro rank on LMArena?
No board Model Gauntlet mirrors currently lists this exact model revision under a reviewed identity, so no rating is reported here.
What does GPT-5.5 Pro cost?
OpenRouter lists it at $30.00 per million input tokens and $180 per million output tokens, retrieved July 22, 2026. Those are the platform's routed prices, not first-party provider prices.