LLM API
GoogleText generationReleased February 19, 2026

Gemini 3.1 Pro (Preview)

Gemini 3.1 Pro (Preview) costs $2 per 1M input tokens and $12 per 1M output tokens on LLM API, with a 1.05M-token context window.

Pricing

Lowest price among 2 providers, after discounts.

Gemini 3.1 Pro (Preview) prices on LLM API
Input$2per 1M tokens
Output$12per 1M tokens
Cache read$0.2per 1M tokens

Providers

Prices after each provider’s discount; the lowest in bold.

Providers of Gemini 3.1 Pro (Preview) on LLM API
Google AI Studio$2$12$0.21.05M4K
Google Vertex AI$2$12$0.21.05M4K

Features

  • ToolsYes
  • Parallel tool callsNo
  • Image inputYes
  • ReasoningYes

    Levels: low, medium, high

  • Prompt cachingYes
  • Structured outputsNo
  • JSON modeYes
  • StreamingYes
  • Web searchNo
  • BatchYes

Call Gemini 3.1 Pro (Preview)

POST /v1/chat/completionsSet LLMAPI_KEY to your LLM API key.Chat Completions docs

import os

from openai import OpenAI

client = OpenAI(
    base_url="https://api.llmapi.ai/v1",
    api_key=os.environ["LLMAPI_KEY"],
)

response = client.chat.completions.create(
    model="gemini-3.1-pro-preview",
    messages=[{"role": "user", "content": "Hello"}],
)
print(response.choices[0].message.content)

More from Google

All Google text models

Prices synced .

You've been invited to LLM API

Top up $50 or more and the friend who invited you gets $20 in credits. We pay the $20; your credits stay yours. Referral terms

Sign up