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gemini-3.1-pro-preview API pricing & access

gemini-3.1-pro-preview API pricing: $2 per 1M tokens. Gemini 3.1 Pro Preview API for reasoning and multimodal document analysis.

gemini-3.1-pro-preview API access

Gemini 3.1 Pro Preview API for reasoning and multimodal document analysis.

Compare supported API endpoints and capabilities, then access gemini-3.1-pro-preview through the unified API gateway.

Category: text
Context length: 1048576 tokens
Maximum output: 65536 tokens
Supported APIs: Gemini API, OpenAI Chat Completions API, Anthropic Messages API
API endpoints: POST /v1beta/models/gemini-3.1-pro-preview:generateContent, POST /v1/chat/completions, POST /v1/messages
Input modalities: text, image, video, audio, file
Output modalities: text
Capabilities: function calling, structured output, reasoning, caching, vision

gemini-3.1-pro-preview API pricing

Base input price: $2 per 1M tokens
Base output price: $12 per 1M tokens

Base prices are shown in USD before group-specific adjustments. Open the live pricing page for current access-group prices.

About gemini-3.1-pro-preview

Gemini 3.1 Pro Preview analyzes text, images, video, audio, and PDFs and produces text. The official limits are 1,048,576 input tokens and 65,536 output tokens.

Evaluate it for analysis across documents and media. Preview behavior may change; validate media fields and request limits with the endpoint selected on this page.

Official model reference, checked 2026-10-11.

API pricing and model selection

Review the prices and endpoints on this page. Check your account discounts, quota and actual usage after signing in, then evaluate the selected endpoint on a small sample.

Compare models in this category · API integration documentation.

Use cases and prompting

Tie answers to the source material

Explain each input's purpose and ask for page references, timestamps, or supporting passages. Start with a short text or one image before adding video, audio, or PDFs.

Include missing information, conflicting evidence, and invalid file formats in your evaluation set. Check both answer grounding and endpoint errors; media fields vary between protocols.

A task to evaluate

Cross-check the supplied materials. Attach a file name, page or timestamp to each conclusion. List contradictions, missing information and unresolved claims separately.

Compare the output with your acceptance criteria. Record the model, endpoint, input size, elapsed time and actual usage; change one condition at a time.

How to call gemini-3.1-pro-preview

gemini-3.1-pro-preview is served through tbuy's unified gateway. Existing OpenAI or Anthropic SDK code keeps working: point base_url at https://modelsok.com and use your tbuy API key.

curl (OpenAI-compatible)

curl https://modelsok.com/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "gemini-3.1-pro-preview", "messages": [{"role": "user", "content": "Hello"}]}'

Python (openai SDK)

from openai import OpenAI

client = OpenAI(base_url="https://modelsok.com/v1", api_key="YOUR_API_KEY")
response = client.chat.completions.create(
    model="gemini-3.1-pro-preview",
    messages=[{"role": "user", "content": "Hello"}],
)
print(response.choices[0].message.content)

Python (anthropic SDK)

from anthropic import Anthropic

client = Anthropic(base_url="https://modelsok.com", api_key="YOUR_API_KEY")
message = client.messages.create(
    model="gemini-3.1-pro-preview",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello"}],
)
print(message.content[0].text)

Frequently asked questions about gemini-3.1-pro-preview

What is gemini-3.1-pro-preview?

Gemini 3.1 Pro Preview API for reasoning and multimodal document analysis.

How do I call gemini-3.1-pro-preview?

Create an API key with access to gemini-3.1-pro-preview, then use the exact model ID and a supported endpoint from the API access section. Request fields depend on the selected endpoint.

How is gemini-3.1-pro-preview priced?

Pricing depends on the selected provider group and the model billing unit. Refer to the current input, output, request, or media prices in the pricing section.

What is the context window of gemini-3.1-pro-preview?

The model catalog lists a context window of 1048576 tokens. Check the selected endpoint for request limits.

What is the maximum output of gemini-3.1-pro-preview?

The model catalog lists a maximum output of 65536 tokens. Your request settings may set a lower limit.

How should I evaluate gemini-3.1-pro-preview for my project?

Start with the use cases and prompting guidance on this page, then evaluate the model with representative inputs from your project.

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