Cheapest GPT-5.5 API: Clidex is 95% below the official price
GPT-5.5 costs $5.00/$30 per 1M tokens from OpenAI. The cheapest quote is Clidex: $0.250 in, $1.50 out. Full table and buying checklist below.
| # | Provider | 1M input | 1M output | Discount | Tokens per $100 |
|---|---|---|---|---|---|
| — | Official list | $5.00 | $30.00 | 0% | 10.9M |
| 1 | $0.250 | $1.50 | −95% | 218M | |
| 2 | $0.300 | $1.80 | −94% | 182M | |
| 3 | $0.750 | $4.50 | −85% | 72.7M | |
| 4 | $3.67 | $22.03 | −27% | 14.9M |
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.