Gemini 3.1 Pro (preview) API pricing
Google's most capable Gemini line — still in preview; no GA 3.x Pro exists yet.
Input
$2.00
per 1M tokens
Cached input
$0.20
per 1M tokens
Output
$12.00
per 1M tokens
Context window
1M
max output 64K
Prices last synced Aug 20, 2026 from the LiteLLM community price catalog — the same catalog Marginal prices real usage events against, refreshed daily. Hand-checked against the provider's official pricing page on Aug 20, 2026. Spot an error? Tell us.
Pricing notes
- Long-context surcharge: above 200K prompt tokens the whole request bills $4.00 input / $18.00 output per 1M.
- Cache storage is $4.50 per 1M tokens per hour — the Pro-class carrying cost. No free tier on this model.
What would Gemini 3.1 Pro (preview) cost you?
Enter your workload — add other models to compare the same traffic across providers.
Your monthly workload
Cache hit rate = share of input tokens served from the provider's prompt cache, billed at the model's cached-input price. Estimates use standard per-token rates — batch discounts, service tiers, and long-context surcharges are not applied.
| Model | Input | Cached input | Output | Per request | Monthly |
|---|---|---|---|---|---|
| Gemini 3.1 Pro (preview) | $1,200 | $80.00 | $3,000 | $0.00856 | $4,280 |
Compare Gemini 3.1 Pro (preview)
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Tracking Gemini 3.1 Pro (preview) in production?
Marginal prices every call your app actually makes — cached tokens, dated snapshots, model switches included — and slices spend by customer or feature. One track() call to integrate.