Cheapest o3-pro API: RunAPI is 91% below the official price
o3-pro costs $20.00/$80.00 per 1M tokens from OpenAI. The lowest quote in the index is RunAPI: $1.80 in, $7.20 out. Full table and buying checklist below.
| # | Provider | 1M input | 1M output | vs list | Tokens per $100 |
|---|---|---|---|---|---|
| — | Official list | $20.00 | $80.00 | 0% | 3.33M |
| 1 | $1.80 | $7.20 | −91% | 37.0M | |
| 2 | $20.00 | $80.00 | 0% | 3.33M | |
| 3 | $29.40 | $117.61 | +47% | 2.27M |
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.