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Gemini 3.1 Pro Preview

Preview

Output modality: text only. Tiered pricing by prompt size: input $2.00 (<=200k tokens) / $4.00 (>200k); output $12.00 (<=200k) / $18.00 (>200k); cached input $0.20 (<=200k) / $0.40 (>200k) per 1M tokens. The values shown here are the <=200k tier. gemini-3-pro-preview alias now points to this model (the original gemini-3-pro-preview was shut down 2026-03-09). Preview/not-stable; may change. Release date refined from month precision (2026-02) to the exact day 2026-08-05, read first-party from the Release date column of Google's deprecations table, which states February 19, 2026. Source pages also include ai.google.dev/gemini-api/docs/pricing and /deprecations.

Gemini 3.1 Pro Preview by Google costs $2 per 1M input tokens and $12 per 1M output tokens ($4.50/1M blended), with a 1.0M (1.048.576-token) context window. It is in preview, with a knowledge cutoff of Jan 2025.

Last verified: 13 Aug 2026 · sourced from official provider documentation

Provider
Google
Status
Preview
Input price
$2 / 1M tokens
Output price
$12 / 1M tokens
Cached input
$0.2 / 1M tokens
Blended price
$4.50 / 1M tokens
Context window
1.048.576 tokens (1.0M)
Max output
65.536 tokens
Modality
text, image, video, audio, pdf
Open weights
No — API only
Knowledge cutoff
2025-01
Released
19 Feb 2026
API string
gemini-3.1-pro-preview

Source: Google official documentation ↗

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FAQ

Gemini 3.1 Pro Preview — questions & answers

How much does Gemini 3.1 Pro Preview cost?

Gemini 3.1 Pro Preview is priced at $2 per 1M input tokens and $12 per 1M output tokens ($4.50/1M blended at a 3:1 input-to-output ratio), with cached input at $0.2 per 1M tokens.

What is the context window of Gemini 3.1 Pro Preview?

Gemini 3.1 Pro Preview has a 1.048.576-token context window (1.0M), with up to 65.536 output tokens per request.

Is Gemini 3.1 Pro Preview deprecated?

No — Gemini 3.1 Pro Preview is in preview and not currently scheduled for deprecation or retirement in our tracker.

Does Gemini 3.1 Pro Preview support image or vision input?

Yes — Gemini 3.1 Pro Preview accepts image input. Listed modalities: text, image, video, audio, pdf.

Can I self-host Gemini 3.1 Pro Preview?

No — Gemini 3.1 Pro Preview is proprietary. Its weights are not publicly released, so it is available only through Google's API (or hosted partners), not for self-hosting.

What is the API model string for Gemini 3.1 Pro Preview?

The API model identifier for Gemini 3.1 Pro Preview is "gemini-3.1-pro-preview" when calling Google's API.

What is Gemini 3.1 Pro Preview's knowledge cutoff?

Gemini 3.1 Pro Preview's training knowledge cutoff is Jan 2025.