OpenAI API pricing
GPT-5.5 pricing
Input / 1M tokens
$5
Output / 1M tokens
$30
Cached input / 1M
$0.50
Prompts over 272,000 tokens cost $10 in and $45 out per million, for the whole request.
Source: OpenAI pricing, checked 1 Nov 2026. API name: gpt-5.5.
What a prompt costs on GPT-5.5
| Example | Tokens in / out | Cost | 1,000 a day, per month |
|---|---|---|---|
| A short question and answer | 50 / 300 | $0.0092 | $277.50 |
| A one-page document summarised | 700 / 400 | $0.015 | $465.00 |
| A 300-line code file reviewed | 4,000 / 1,200 | $0.056 | $1,680 |
| A 50-page report summarised | 35,000 / 1,500 | $0.220 | $6,600 |
Token sizes are typical, not exact. Replies include any thinking the model does.
Other GPT models
GPT-6 AstraGPT-6.1 SolGPT-6.1 TerraGPT-6 LunaGPT-5.4 miniGPT-5 nano
FAQ
How much does GPT-5.5 cost?
$5 per million input tokens and $30 per million output tokens on OpenAI's standard API tier, and $0.50 per million for cached input. Checked 1 Nov 2026.
What does one prompt cost on GPT-5.5?
A 1,000-token prompt with a typical medium-length reply costs about $0.029. Paste your own prompt into the calculator for an exact figure.