Gemini 3.1 Pro Preview
by GoogleReleased Feb 19, 2026
google/gemini-3.1-pro-preview- Reads images
- Reads files and PDFs
- Hears audio
- Calls tools
Gemini 3.1 Pro Preview is Google’s frontier reasoning model, delivering enhanced software engineering performance, improved agentic reliability, and more efficient token usage across complex workflows. Building on the multimodal foundation...
- Input / 1M tokens
- $2.40
- Output / 1M tokens
- $14.40
- Context
- 1.05M
- Longest answer
- 66K
What it costs
What each call is charged to the token's AI credit.
| Billed for | You pay |
|---|---|
| Input tokens | $2.40 / 1M |
| Output tokens | $14.40 / 1M |
| Cached input, read | $0.24 / 1M |
| Cached input, written | $0.45 / 1M |
| Each input image | $0.000002 |
| Each web search | $0.02 |
| Prompts over 200,000 tokens | $4.80 in, $21.60 out |
A typical call
A short chat turn: 2,000 tokens in, 500 out.
- per call
- $0.01
- calls per $20
- 1,666
What it can do
From its listing. The router passes every field through.
- Reads imagesYes
- Reads files and PDFsYes
- Hears audioYes
- Calls toolsYes
- Answers in a JSON schemaYes
- Reasons before it answersYes
- Searches the webYes
- Caches long promptsYes
- Draws imagesNo
Call it
Any router key works, in the format your SDK already speaks.
import OpenAI from "openai";const ai = new OpenAI({ baseURL: "https://relayfor.si/api/v1", apiKey: process.env.RELAYFOR_ROUTER_KEY,});const reply = await ai.chat.completions.create({ model: "google/gemini-3.1-pro-preview", messages: [{ role: "user", content: "Welcome the 1,000th holder in one line." }],});Specifications
What its maker and providers list for it.
- Reads
- Audio, Files, Images, Text, and Video
- Writes
- Text
- Context
- 1,048,576 tokens
- Longest answer
- 65,536 tokens
- Reasoning effort
- low to high
- Intelligence index
- 29.7 (#47 of 220 rated)
- Released
- Feb 19, 2026
- Moderation
- None
Request fields
The fields its providers accept, passed through as you send them.
- include_reasoning
- max_tokens
- reasoning
- reasoning_effort
- response_format
- seed
- stop
- structured_outputs
- temperature
- tool_choice
- tools
- top_p
Questions
How much does Gemini 3.1 Pro Preview cost?
$2.40 per million input tokens and $14.40 per million output tokens, paid from the token's AI credit. A call of 2,000 tokens in and 500 out costs about $0.01.
How do I call Gemini 3.1 Pro Preview?
Make a router key for one of your tokens on the dashboard, point any OpenAI or Anthropic SDK at https://relayfor.si/api/v1 and send the model id google/gemini-3.1-pro-preview. The token's AI credit pays for each call.
How long a prompt can Gemini 3.1 Pro Preview take?
Up to 1,048,576 tokens of context, and up to 65,536 tokens in one answer.
Are my prompts stored?
No. The RFS Router passes each call through and keeps only its token counts and cost, for the token's usage page.
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