GPT-5.5 at a glance
GPT-5.5 and GPT-5.5 Pro arrived as OpenAI's new frontier models, with a 1M-token context and medium reasoning by default.
What changed with GPT-5.5
OpenAI's GPT-5.5 model snapshot is dated April 23, 2026 (gpt-5.5-2026-04-23), and the API changelog records GPT-5.5 and gpt-5.5-pro reaching the API on April 24. OpenAI positioned it as a frontier model for complex professional work and coding.
The model supports a context window of about 1.05M tokens and up to 128K output tokens. Reasoning effort defaults to 'medium', and prompts over 272K input tokens are billed at higher rates (2x input, 1.5x output).
GPT-5.5 benchmarks and pricing
Values are copied from the linked source on the date shown. They are not IA Compa measurements.
- Input price per 1M tokensas of · Source for Input price per 1M tokens: developers.openai.com (opens in a new tab)
- $5.00
- Output price per 1M tokensas of · Source for Output price per 1M tokens: developers.openai.com (opens in a new tab)
- $30.00
- Context windowas of · Source for Context window: developers.openai.com (opens in a new tab)
- 1.05M tokens
- Output speed (xhigh)as of · Source for Output speed (xhigh): artificialanalysis.ai (opens in a new tab)
- 79 tokens/s
How it compares
Other models in the same category that we have covered, using each model's latest recorded value. (Models)
Where to compare GPT-5.5
Independent leaderboards and official resources for comparing this model yourself. Rankings change often; each site shows its own current data.
Leaderboards
General leaderboards
Why GPT-5.5 matters for businesses
GPT-5.5 cost twice as much per input token as GPT-5.4, so it suited high-value tasks more than bulk automation. Artificial Analysis now marks it as deprecated in favor of the GPT-5.6 and GPT-6 families, so it is mainly relevant for existing deployments.
Sources for this story
- Introducing GPT-5.5 (opens in a new tab)Official
OpenAI · openai.com
- OpenAI API changelog (opens in a new tab)Official
OpenAI · developers.openai.com
- GPT-5.5 model page (opens in a new tab)Official
OpenAI · developers.openai.com
- GPT-5.5 model page (opens in a new tab)Benchmark
Artificial Analysis · artificialanalysis.ai
Last verified: . IA Compa summarizes public announcements for business readers. We are not affiliated with the companies mentioned. Always confirm details, pricing, and availability with the official source.
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