Google maintains a dedicated preview documentation page for Gemini 3.1 Pro Preview on its Gemini API developer site, positioning it within the latest Gemini generation of preview models. The page is published under the Gemini API model documentation path, signaling that Google treats this identifier as part of its Gemini family of preview offerings intended for developers evaluating frontier multimodal capabilities. Its placement in the Gemini 3 lineup aligns it with the newer tier of Google models, even as Google Cloud's agent platform documentation currently highlights Gemini 3.7 Flash and Gemini 3.6 Flash introductory pricing for their own tier.

Because the developer page is presented as a preview entry, the model is best understood as an early-access option in the Gemini 3 generation rather than a finalized production release. Documentation availability on ai.google.dev supports the practical workflow of selecting Gemini 3.1 Pro Preview for experimentation with Gemini 3-era behavior, while the Google Cloud pricing pages focus on Flash tiers and do not yet feature a stable production pricing line for this preview. Teams evaluating Gemini 3.1 Pro Preview should treat it as a preview-tier option within the broader Gemini roadmap, suitable for exploratory integration ahead of a more stable successor.