Gemini 3.1 Pro Preview Customtools API Pricing

Gemini 3.1 Pro Preview Customtools pricing by provider

3 listings across 3 providers. Token prices are in US dollars per 1M tokens. The highlighted row is the price quoted above.

Other Gemini 3.1 Pro Preview Customtools prices on Google AI Studio

What Gemini 3.1 Pro Preview Customtools costs in practice

1,000 requests with 2,000 input and 500 output tokens each

100 long-document requests with 100,000 input and 2,000 output tokens each

Gemini 3.1 Pro Preview Customtools features

Input: text, image, audio, video. Output: text.

• Function calling
• Structured output
• Image input
• PDF input
• Audio input
• Video input
• Reasoning
• Prompt caching
• Web search

Use Gemini 3.1 Pro Preview Customtools with LiteLLM

Call Gemini 3.1 Pro Preview Customtools through the LiteLLM Python SDK, or put it behind the LiteLLM proxy and send OpenAI-format requests to /v1/chat/completions. LiteLLM tracks the cost of every request at these prices.

from litellm import completion

response = completion(
    model="gemini/gemini-3.1-pro-preview-customtools",
    messages=[{"role": "user", "content": "Hello!"}],
)

model_list:
  - model_name: gemini-3.1-pro-preview-customtools
    litellm_params:
      model: gemini/gemini-3.1-pro-preview-customtools
      api_key: os.environ/GEMINI_API_KEY

curl http://0.0.0.0:4000/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer sk-1234" \
  -d '{
    "model": "gemini-3.1-pro-preview-customtools",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Gemini 3.1 Pro Preview Customtools FAQ

More Google models

• Gemini 3.8 Flash Cyber$1.50 / $7.50 per 1M tokens
• Gemini 3 Flash Preview Search$0.50 / $3 per 1M tokens
• Gemini 3.8 Flash$0.75 / $3.75 per 1M tokens
• Gemini 3 Flash$0.625 / $3.75 per 1M tokens
• Gemini 3.1 Pro$2 / $12 per 1M tokens
• Gemini 3.7 Flash$0.75 / $3.75 per 1M tokens
• Gemini 3.5 Flash Lite$0.30 / $2.50 per 1M tokens
• Gemini 3.6 Flash$0.75 / $3.75 per 1M tokens