Gemini 3.1 Pro Preview

Google's preview model for the most complex reasoning and agentic workflows.

PreviewAdvanced ReasoningAgentic Workflows

Context Window

1M tokens

gemini-3.1-pro-preview

Max Output

1M tokens

Input

$1.8$2.00

10% off

1M tokens

Output

$10.8$12.00

10% off

1M tokens

Model Codegemini-3.1-pro-preview

Playground

Model Code

gemini-3.1-pro-preview

Reference inputs

Reference Images0/10

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Output

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Pricing

Plan	Context Window	Max Output	Input	Output	Cache Write	Cache Read
gemini-3.1-pro-preview	1M tokens	-	$1.8$2.0010% off 1M tokens	$10.8$12.0010% off 1M tokens	-	-

Input · $3.6 · 1M tokens

Output · $16.2 · 1M tokens

Context caching · $0.18 · 1M tokens

Context caching · $0.36 · 1M tokens

README

Gemini 3.1 Pro Preview is Google's newer high-end preview model for complex tasks that require stronger reasoning, broader synthesis, and more advanced agentic behavior than mainstream production models.

Google introduces Gemini 3.1 Pro as a model for tasks where a simple answer is not enough, with improved reasoning for complex work.
The model is rolling out in preview across developer and enterprise surfaces to validate upgrades and push agentic workflows further.
It is aimed at multi-step problem solving, deeper synthesis across data sources, and higher-complexity AI product experiences.

API

Use the API docs for request format, parameters, and integration details.

Google's preview model for the most complex reasoning and agentic workflows.

Model Code

gemini-3.1-pro-preview

View API Docs

API

Endpoint

POST /v1beta/models/{model}:generateContent

Authentication

x-goog-api-key: YOUR_REACH_API_KEY
Content-Type: application/json

Example

curl -X POST "https://direct.reachapi.ai/v1beta/models/YOUR_MODEL_ID:generateContent" \
  -H "x-goog-api-key: YOUR_REACH_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "contents": [
      {
        "role": "user",
        "parts": [
          {
            "text": "Introduce ReachAPI in one sentence."
          }
        ]
      }
    ],
    "generationConfig": {
      "temperature": 0.2
    }
  }'

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