Gemini 3.1 Pro Preview

google/gemini-3.1-pro-preview

A chat model with a 1M-token context window, at $2.10 per million input tokens and $12.60 per million output tokens.

Details

Maker: google
Kind: Chat
Context window: 1,000,000 tokens
Max output: 64,000 tokens
Input: $2.10 per million tokens
Cached input: $0.21 per million tokens, 90% off
Cache write: Same as input
Output: $12.60 per million tokens
Capabilities: Reasoning, tool use, vision, file input, web search
Takes: Text, image, pdf
Returns: Text
Zero data retention: Not on every provider
No training on requests: Yes, on every provider
Released: 2026-02-19
Newer model: google/gemini-4-argonReleased later by the same maker, costs no more, and lists the same capabilities. Compare the two

Description

This model improves upon Gemini 2.5 Pro and is catered towards challenging tasks, especially those involving complex reasoning or agentic workflows. Improvements highlighted include use cases for coding, multi-step function calling, planning, reasoning, deep knowledge tasks, and instruction following.

Call it

curl

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

Set PHANTOM_KEY to your key. Any OpenAI client works with the base URL https://phantom.codes/v1.

Get a key Compare with another model