Following its debut in ChatGPT and Codex, OpenAI has officially opened access to the GPT-5.5 API. Developers can now integrate the model, identified as
GPT-5.5 (snapshot GPT-5.5-2026-04-23), into their APPlications.API Pricing and Specifications
openai has established a tiered pricing structure to accommodate different usage needs, including a cost-effective caching option and surcharges for extreme long-context processing.
| Feature | Specification / Price |
|---|---|
| Input Price | $5.00 per 1M tokens |
| Cached Input | $0.50 per 1M tokens |
| OuTPUt Price | $30.00 per 1M tokens |
| Context Window | 1.05 Million Tokens |
| Max Output | |
| Knowledge Cutoff | December 2025 |
Note on Long Context: Inputs exceeding 272K tokens are subject to a surcharge, billed at 2x the Standard input price and 1.5x the standard output price.
GPT-5.5 Pro and Advanced Features
Alongside the standard model, OpenAI has released the API for gpt-5.5 Pro, designed for high-complexity tasks.
Pro Pricing: $30 per 1M input tokens and $180 per 1M output tokens.
Availability: Both Batch API and Flex pricing are now live for supported models.
Configurable Reasoning Effort
Developers can now fine-tune the model's "thinking" process to balance speed and accuracy. The API supports five distinct levels of reasoning effort:
nonelowmedium(Default)highxhigh
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