Cheapest GPT-5.5 Pro API: Clean API is 84% below the official price
GPT-5.5 Pro costs $30.00/$180.00 per 1M tokens from OpenAI. The lowest quote in the index is Clean API: $8.95 in, $8.95 out. Full table and buying checklist below.
| # | Provider | 1M input | 1M output | vs list | Tokens per $100 |
|---|---|---|---|---|---|
| — | Official list | $30.00 | $180.00 | 0% | 1.82M |
| 1 | $8.95 | $8.95 | −84% | 11.2M | |
| 2 | $21.94 | $131.64 | −27% | 2.49M |
Scroll the table sideways to see every price.
Tokens per $100 assume a “code” mix: 5 input tokens per output token. Prices are crawled; verify them on the provider page before buying.
What to check before buying
- Test the key with the free API checker — it verifies the endpoint responds, without sending tokens.
- Compare the blended cost for your workload, not just the input price: output tokens dominate in agent workloads.
- Check uptime and minimum top-up: the cheapest provider is useless if it is down half the day.