Gemini 3.1 Pro API price, and what each result really costs
Google, listed 19 Feb 2026. Price checked 12 Nov 2026; unchanged since we started tracking it. Source: Google's pricing page. google/gemini-3.1-pro-preview
List price per million tokens
- Input
- $2.00
- Cached input
- $0.20
- Output
- $12.00
- Context window
- 1.05M tokens
Note: Preview. Prompts >200K: $4 in / $0.40 cached / $18 out.
What it costs per task, and per task that works
Six common task shapes with typical token counts. The real cost counts the tries that get redone; the rates are examples, not measurements.
| Task | Per 1,000 tries | Per 1,000 that work, 8 in 10 | Per 1,000 that work, 6 in 10 | Per 1,000 that work, 4 in 10 |
|---|---|---|---|---|
| Support bot answer3,000 in / 300 out | $9.60 | $12.00 | $16.00 | $24.00 |
| Invoice field extraction2,500 in / 250 out | $8.00 | $10.00 | $13.33 | $20.00 |
| Lead scoring1,200 in / 100 out | $3.60 | $4.50 | $6.00 | $9.00 |
| Email reply draft1,500 in / 400 out | $7.80 | $9.75 | $13.00 | $19.50 |
| Translation900 in / 800 out | $11.40 | $14.25 | $19.00 | $28.50 |
| Search re-ranking4,000 in / 50 out | $8.60 | $10.75 | $14.33 | $21.50 |
Work out your own real cost per resultTest Gemini 3.1 Pro on your own prompt
Compare Gemini 3.1 Pro with
- Gemini 4 Argon$2.00 in / $10.00 outSwitch cost
- Gemini 4 Carbon$2.00 in / $10.00 outSwitch cost
- GPT-5.6 Terra$2.00 in / $12.00 outSwitch cost
- GPT-4o$2.50 in / $10.00 outSwitch cost
- GPT-6.1 Sol$2.00 in / $10.00 outSwitch cost
Questions
How much does the Gemini 3.1 Pro API cost?
$2.00 per million input tokens and $12.00 per million output tokens, or $0.20 per million for cached input. Price checked 12 Nov 2026; unchanged since we started tracking it.
What does a result that works really cost with Gemini 3.1 Pro?
A support bot answer (about 3,000 tokens in, 300 out) costs $0.0096 per try. If 6 in 10 work first time, each answer that works really costs $0.016, because the redone ones were paid for too.