Gemini 3.1 Pro API pricing: provider comparison (RunAPI is at the official list price)
Gemini 3.1 Pro costs $0.00/$0.00 per 1M tokens from Google. The lowest quote in the index is RunAPI: $0.129 in, $0.774 out. Full table and buying checklist below.
| # | Provider | 1M input | 1M output | vs list | Tokens per $100 |
|---|---|---|---|---|---|
| — | Official list | $0.00 | $0.00 | 0% | — |
| 1 | $0.129 | $0.774 | 0% | 423M | |
| 2 | $0.300 | $1.80 | 0% | 182M | |
| 3 | $0.300 | $1.80 | 0% | 182M | |
| 4 | $1.34 | $9.40 | 0% | 37.2M | |
| 5 | $4.47 | $4.47 | 0% | 22.4M |
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.