Google (Gemini) · Gemini 3.1 Pro Preview
gemini-3.1-pro-previewAvailable from the provider.
- Released
- Deprecatednot announced
- Retirednot announced
Summary
Gemini 3.1 Pro Preview is the preview release of Google's Gemini 3 Pro series, at $2 per million input tokens and $12 per million output tokens. It takes text, image, video, audio and PDF input within a 1,048,576-token context window and is aimed at software engineering and tool-heavy agentic work.
Pro is Google's reasoning-focused series, above Flash. Gemini 3.1 Pro Preview is listed with a February 2026 update and is named on Google's deprecation page as the replacement for the retired Gemini 2.5 Pro preview snapshots. A separate endpoint variant, gemini-3.1-pro-preview-customtools, is tuned for agentic workflows that use custom tools and bash.
It supports structured outputs, caching, function calling, code execution, search grounding, URL context, thinking and the Batch API, with a 65,536-token output limit. The Live API is not supported and it does not generate images or audio.
It is a preview model. Google's deprecation history shows preview models being shut down on shorter timelines than stable releases, so treat the model ID as provisional and keep the migration path open.
Tags
Editorial tags reflect our assessment; documented tags are backed by the sources below.
Tier
FrontierAccess
Hosted APISpecifications
- Input price
- $2.00 / M tok
- Output price
- $12.00 / M tok
- Price class
- Premium
- Context window
- 1M tokens
- Max output
- 65,536 tokens
- Released
- 19 February 2026
- Input modalities
- text, image
- Output modalities
- text
- Knowledge cutoff
- unknown
- Tool use
- Yes
- Structured output
- Yes
- License
- unknown
- Maker
- Google (Gemini)
Use it for
- Run software engineering tasks that need careful tool orchestration across many steps.
- Evaluate the Gemini 3 Pro series before a stable release lands.
- Migrate off the retired Gemini 2.5 Pro preview snapshots, for which Google names this as the replacement.
Avoid it when
- You need a stable model ID for a long-lived production integration; this is a preview release.
- You need more than 65,536 output tokens in a single response.
- Cost per call is a constraint; Gemini 3.8 Flash costs $0.75 / $3.75 against $2 / $12 here.
Alternatives
What to use instead. Curated suggestions are written by our editors for this model; derived ones are ranked automatically from tags, tier and price class.
- Gemini 3.8 Flashcurated
Google (Gemini)
gemini-3.8-flashA stable Gemini 3 model at $0.75 / $3.75 with the same limits and modalities, and no preview risk.
In $0.75 / M tokOut $3.75 / M tok
ActiveTextVisionChat+6 - Gemini 2.5 Procurated
Google (Gemini)
gemini-2.5-proThe stable Pro release at $1.25 / $10, cheaper but with a January 2025 knowledge cutoff.
In $1.25 / M tokOut $10.00 / M tok
ActiveTextVisionChat
Change history
Nothing has changed since this model was first recorded — no status change and no price change.
Price history
No price changes recorded yet.
Sources & verification
Facts
Status, dates, pricing and specifications were verified against these pages.
Last verified: (2026-09-10 12:00) · ✓ verified
Editorial profile
The summary, the advice and the curated alternatives are our assessment, not a provider claim.
Editorial profile reviewed on by llm-researcher.