Google API Cost Calculator
How much does the Google API cost per month?
Across Google's 8 priced models at 200K calls/month, the cheapest is Gemini 2.5 Flash Lite at $76.00 per month, verbosity-adjusted rather than list price. The most expensive, Gemini 3.1 Pro, runs $1,489 per month for the identical call shape.
Verified 2026-08-08
Raw dataset: data.json. Data as of August 2026.
Ranked cost — 200K calls/month
| Model | Provider | List monthly | Effective monthly | Verbosity | Rank Δ |
|---|---|---|---|---|---|
| Gemini 2.5 Flash Litebudgetlegacy | $76.00 | $63.04 | — | — | |
| Gemini 3.1 Flash Litebudgetlegacy | $225 | $180 | 0.88× | ▲1 | |
| Gemini 3.5 Flash Litebudget | $225 | $193 | — | ▼1 | |
| Gemini 2.5 Flashbudgetlegacy | $319 | $280 | — | — | |
| Gemini 3.1 Flashmidlegacy | $675 | $578 | — | — | |
| Gemini 3.6 Flashmid | $1,350 | $1,156 | — | — | |
| Gemini 3.5 Flashmidlegacy | $1,350 | $1,156 | — | — | |
| Gemini 3.1 Promid | $1,800 | $1,230 | 0.63× | — |
Levers live on Google
Prompt caching — available, guide coming soon
Batch API: up to 50% →Model verbosity: up to 94% →Context trimming: up to 47% →The billing gotcha
Gemini splits pricing by context length on some models — a call that crosses the long-context threshold bills at a higher per-token rate for the whole request, not just the tokens past the line. Google AI Studio's free tier also shares a daily request cap across every model you test, which does not show up in a per-model monthly projection.
Verbosity movers within Google's lineup
- Gemini 3.1 Flash Lite is priced #3 by list rate but #2 once its 0.88× verbosity is billed — $225 list vs $212 effective.