Gemini 3.1 Pro (preview) pricing: API and Gemini plans
Gemini 3.1 Pro (preview) costs $2 per million input tokens and $12 per million output, with a 1.05M context window. In Gemini, the cheapest plan with it is Google AI Pro at $19.99/mo.
AIGROW credit covers Claude Opus 5.5, Claude Fable 5.2, Claude Fable 5.1, GPT-6 Astra, Claude Sonnet 5.5, GPT-6.1 Sol, GPT-6.1 Terra, Grok 4.7 and Gemini 4 Argon. Gemini 4 Argon below list price
$25 a month brings $110 of API credit and cancels any time; $25 once buys $100. US dollars per million tokens, standard rate, shortest context band. Plan prices read 20 October 2026. Number 39 of 256 on the Epoch Capabilities Index by Epoch AI, data of 12 November 2026. CC BY 4.0 Newer model: Gemini 4 Argon
- 1,000 support replies
- $10.80
- Cached input
- $0.20
- Context window
- 1,048,576 tokens
- Released
- 19 Feb 2026
- Weights
- Closed weights
From Google’s own pages, 12 November 2026.
Gemini 3.1 Pro (preview) costs $2 per million input tokens and $12 per million output tokens on Google’s own API, and $0.20 for cached input. At those prices 1,000 support replies cost $10.80, the 12th most expensive of 49 priced models on our list.
In Gemini: Gemini 3.1 Pro (preview) is included in Google AI Pro ($19.99/mo), Google AI Ultra 5x ($99.99/mo), Google AI Ultra 20x ($199.99/mo).
gemini.google/us/subscriptions/ · Read 20 October 2026. Prices can differ by country and include or exclude tax depending on the country.
AIGROW API credit per million input / output tokens: Claude Opus 5.5 $1.60 / $8.00, Claude Fable 5.2 $3.20 / $16.00, Claude Fable 5.1 $4.00 / $20.00, GPT-6 Astra $2.50 / $12.50, Claude Sonnet 5.5 $0.80 / $4.00, GPT-6.1 Sol $0.50 / $2.50, GPT-6.1 Terra $0.25 / $1.25, Grok 4.7 $0.50 / $1.50 and Gemini 4 Argon $1.00 / $5.00. That is up to 75% below list price. See API credit
What a job costs
Three jobs, 1,000 runs of each, at the list price above, and where each puts Gemini 3.1 Pro (preview) among the 49 models with a list price.
| Job | 1,000 runs | Among 49 |
|---|---|---|
| Support reply3,000 in, 400 out. | $10.80 | 12th most expensive |
| Document summary25,000 in, 1,000 out. | $62.00 | 12th most expensive |
| Agent task80,000 in (70,000 cached), 3,000 out. | $70.00 | 14th most expensive |
The token counts are ours, chosen to look like real work; the prices are Google’s. All three jobs stay under 100,000 tokens a request, below every long-context surcharge on the list.
Gemini 3.1 Pro (preview) on real small-business tasks
What the AIGROW benchmark measured when Gemini 3.1 Pro (preview) was given 20 office tasks, each marked pass or fail by fixed checks.
- Success rate
- 95% of 20 runs passed (95% interval 76 to 99%), 1st of 36 models.
- Cost per 1,000 passes
- $29.67, failed runs included.
- Answer time
- 17 s median, 21 s at the 90th percentile.
- Strongest and weakest
- Appointment scheduling (100% passed) and review replies (0%).
The small print
What the base rate above leaves out, copied from the maker’s pages: surcharges, discounts, promotions and cache pricing.
Preview model, but Google has no GA 3.x Pro and it is widely used. Prompts above 200K tokens: $4 / $18, cached $0.40. Cache storage $4.50 per MTok per hour. Batch 50% off. Max output 65,536.
Gemini 3.1 Pro (preview) against the models it is weighed with
Each comparison puts both list prices side by side and costs the same three jobs on each.
- vs Gemini 4 Argon
- Gemini 4 Argon against the 3.1 Pro it replaces, at the same $2 input until Argon doubles in December.
- vs Claude Opus 5.5
- Anthropic's default flagship against Gemini 3.1 Pro, with Gemini cheaper on input and output.
- vs GPT-6.1 Sol
- OpenAI's new Sol against Gemini 3.1 Pro, at the same $2 input price with cheaper Sol output.
- vs GPT-6 Astra
- OpenAI's newest flagship against Gemini 3.1 Pro, which costs a fifth as much on input.
- vs Claude Fable 5.1
- Claude Fable 5.1 against Gemini 3.1 Pro, with a fivefold gap in input price.
- vs Claude Opus 5
- A common premium choice for writing and analysis, where Gemini costs well under half.
- vs GPT-5.6 Sol
- OpenAI's GPT-5.6 flagship against Gemini 3.1 Pro, compared on quality per dollar.
- vs Grok 4.7
- Two frontier models with similar input prices and different long-context rules.
Other Google models
| Model | Input | Output | Context | 1,000 replies |
|---|---|---|---|---|
| Gemini 3.1 Flash-LiteGoogleNewer model: Gemini 3.5 Flash-Lite | $0.25 | $1.50 | 1.05M | $1.35 |
| Gemini 3.5 Flash-LiteGoogle | $0.30 | $2.50 | 1.05M | $1.90 |
| Gemini 3 FlashGoogleNewer model: Gemini 3.8 Flash | $0.50 | $3.00 | 1.05M | $2.70 |
| Gemini 3.8 FlashGoogle | $0.75 | $3.75 | 1.05M | $3.75 |
| Gemini 4 CarbonGoogle | $2.00 | $10.00 | 1.05M | $10.00 |
| Gemini 4 ArgonGoogle | $2.00 | $10.00 | 1.05M | $10.00 |
Where the price comes from
Read on 12 November 2026. Each price is the standard rate for the shortest context band, with no batch or priority discount; long-context surcharges, batch rates and promotions are in each model’s small print. No price was taken from a reseller.
Compare Gemini 3.1 Pro (preview) with 53 other models
The price list sets every model’s input and output price side by side, with what a support reply, a document summary and an agent task cost on each.
Prices checked 12 November 2026 · See them by release date