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AI modelGoogleRead 3 Oct 2026

Gemini 3.1 Pro Preview Custom Tools

1.05MContext
$2In, per 1M
$12Out, per 1M
Lab
Google
Released
25 Feb 2026
Context window
1.05M tokens
Longest answer
66K tokens
Input, per 1M tokens
$2
Output, per 1M tokens
$12
Reads images
Yes
Reasoning
Yes
Tool calling
Yes
Open weights
No
Answers in
text
Model id
google/gemini-3.1-pro-preview-customtools