Google recently posted an important notice on its official developer forum, announcing that it will officially stop providing the Gemini3Pro Preview model service in the Gemini API and AI Studio starting March 9, 2026. To ensure business continuity, Google urges all relevant developers to complete the migration to version 3.1 as soon as possible.

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According to the official schedule, this transition will be divided into two key milestones:

  • March 6: Google will redirect the "latest" model alias to the updated Gemini3.1Pro Preview.

  • March 9: The old version of the model will be discontinued. Developers who fail to manually switch to the new version before this date may face risks of API service interruption.

The Pros and Cons of the Upgrade

Although Google strongly recommends the new generation of models and emphasizes that Gemini3.1Pro is superior in programming capabilities, mathematical logic, and efficiency in handling complex tasks, the feedback from the developer community has shown a mixed reaction.

Some heavy users have expressed concerns on social platforms. They believe that the previous version of 3Pro Preview has unique advantages in content creation and literary writing, especially in terms of humor, natural tone, and smooth storytelling. Compared to that, although the 3.1 version is "smarter," it appears somewhat rigid when dealing with sensitive content and has a high "hallucination rate" (i.e., making serious-sounding nonsense) in specific tasks.

Recommendations for Response

For developers who rely on the old version of the model for copywriting, the most reliable approach right now is to conduct a new round of prompt (Prompt) optimization testing for the 3.1 version before March 9, in an effort to recover the lost creative style.