OpenAI API
GPT-5.5 API Pricing 2026 — Cost per 1 Million Tokens
Current GPT-5.5 API pricing from OpenAI per 1 million tokens, including input, output and cached-token rates when available.
| Model | Rate | Price / 1M tokens |
|---|---|---|
| GPT-5.5 Previous flagship generation retained for comparison and existing integrations. Previous-generation GPT model; prefer GPT-5.6 for new integrations. | Input | $5 |
| GPT-5.5 | Cached input | $0.5 |
| GPT-5.5 | Output | $30 |
How API token cost is calculated
Multiply the number of tokens by the provider rate, then divide by 1,000,000.
cost = tokens × price per 1M ÷ 1,000,000
Example: 250,000 input tokens at $2 / 1M = $0.50.