Model pricing · Google
Gemini 3.1 Pro (Preview) pricing
Gemini 3.1 Pro (Preview) costs $2 per million input tokens and $12 per million output tokens at list price. Best for: long-context analysis (preview).
| Input | $2 / 1M tokens |
|---|---|
| Output | $12 / 1M tokens |
| Cached input (read) | $0.2 / 1M tokens |
| Context window | Not published |
Base tier <=200K prompt; >200K: $4/$18.
Source: Google pricing, cross-checked against models.dev on 2026-09-15. Your provider invoice is authoritative.
What it costs in practice
| Workload | List price | If input is cached |
|---|---|---|
| One request: 10,000 tokens in, 1,000 out | $0.032 | $0.014 |
| A month of that request, 100 times a day | $96.00 | $42.00 |
| A 3,000-token instruction file on 100 requests a day, for a month | $18.00 | $1.80 |
The last row is the always-on cost of an instruction file like CLAUDE.md: paid on every request, whether the task needs it or not. Check how much of yours is waste.
Price history
From tokencheat's dated pricing snapshots. Only changes are listed.
| Since | Input / 1M | Output / 1M |
|---|---|---|
| 2026-01-01 | $2 | $12 |
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Compare every model side by side or price your own workload.