GPT-5.5
Released April 2026 and positioned by OpenAI as smarter and faster for complex coding, research and data-analysis work. It shipped alongside Thinking and Pro variants, neither available on the free tier, and has a published system card.
GPT-5.5 is a frontier AI model from OpenAI. It costs $5.000 per million input tokens and $30.000 per million output tokens (blended $12.500/M), with a 1,050,000-token context window.
- Complex coding and data analysis
- 1M-token context
- Thinking and Pro variants for harder work
- Published system card
- Coding and code review
- Research and data analysis
- Long-context document work
Benchmarks
Also reported by the provider
Results on benchmarks outside the set we compare across models. They are listed for completeness and are deliberately excluded from the bars above and from every ranking on this site, because a score is only comparable against the same benchmark variant. Why benchmark scores do not compare →
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See all 28 →Frequently asked questions
How much does GPT-5.5 cost?
GPT-5.5 costs $5.000 per million input tokens and $30.000 per million output tokens, for a blended reference rate of $12.500 per million tokens.
What is GPT-5.5's context window?
GPT-5.5 supports up to 1,050,000 tokens of context in a single request.
What is GPT-5.5 best for?
GPT-5.5 is well suited to Complex coding and data analysis, 1M-token context and Thinking and Pro variants for harder work.
Who makes GPT-5.5?
GPT-5.5 is developed and served by OpenAI. It was released in Apr 2026.