Model by Google

Gemini 3.1 Pro Preview

Gemini 3.1 Pro Preview is Google's older Pro-tier reasoning model, and it suits developers who need long-context multimodal work and accept preview terms.

Checked 2026-11-05

Gemini 3.1 Pro Preview is Google's older Pro-tier reasoning model, and it suits developers who need long-context multimodal work and accept preview terms. Google's model page labels it Preview, last updated February 2026, with the id gemini-3.1-pro-preview and a separate variant for workflows that mix bash and custom tools. OpenRouter listed it on 19 February 2026. It reads text, images, video, audio and PDF, returns text, and allows 1,048,576 tokens in and 65,536 tokens out. Google's page gives no knowledge cutoff or shutdown date. Price is $2 per million input tokens and $12 per million output tokens for prompts up to 200,000 tokens. Above that it rises to $4 and $18. OpenRouter shows only the lower rate, so long prompts cost more than its listing suggests. Batch rates are half. There is no Live API and no image output. The catch is the Preview label, which Google's page does not pair with any stability promise or shutdown date. We would use it for long documents and large code reads, and move to a stable Gemini model for anything production critical. Figures come from Google's model and pricing pages and OpenRouter. We have not run it ourselves.

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Questions

What is the context window of Gemini 3.1 Pro Preview?

1,048,576 tokens, with up to 65,536 tokens of output.

How much does Gemini 3.1 Pro Preview cost?

$2 per million input tokens and $12 per million output tokens, checked 31 October 2026.

Can I run Gemini 3.1 Pro Preview on my own hardware?

No. The weights are not published, so you use it through the maker's API or a hosting provider.

Who makes Gemini 3.1 Pro Preview?

Google makes it, and released it on 19 February 2026.

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  • OpenRouter

    OpenRouter routes more than 600 models through one API key.

    • Model gateway (router)
    • OpenAI compatible

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