Google · Flagship preview
Gemini 3.1 Pro Preview API pricing and specs
The newest Pro model in the Gemini API, still in preview, with a separate endpoint that favours custom tools over built-in ones.
$2
$0.20
$12
Gemini 3.5 Pro was announced in May but has no API model string yet. Computer use is not listed for this model, and there is no free tier.
Prompts over 200K tokens are billed at $4 input, $0.40 cached and $18 output per million, and the higher rate applies to the whole request.
Spec sheet
- API model string
gemini-3.1-pro-preview- Provider
- Context
- 1.05M tokens
- Max output
- 66K tokens
- Released
- February 19, 2026
- Batch API
- 50% off, results within hours
- Documented agent features
- Tool callingStructured outputBuilt-in web searchAdjustable reasoning
What a task costs
Four reference workloads priced at this model's list rates, with caching applied after the first call. Your numbers will differ; the calculator lets you change every assumption.
| Workload | Per task | Per 1,000 tasks |
|---|---|---|
| Support bot | $0.061 | $61 |
| Coding agent | $2.05 | $2,049 |
| Browser agent | $1.42 | $1,417 |
| Research agent | $1.37 | $1,368 |
Other Google models
Similar cost elsewhere
Models from other providers whose cost on the 30-step coding workload is closest to this one.