Migrate from Gemini 3 Pro Preview to Gemini 3.1 Pro Preview before March 9, 2026

We will discontinue Gemini 3 Pro Preview on Gemini API and Google AI Studio (AIS) effective March 9, 2026.

As we continue to make significant improvements to our Gemini models, we encourage you to migrate to Gemini 3.1 Pro Preview. Additionally, on March 6, 2026, we will switch our -latest alias to point to the latest Gemini 3.1 Pro Preview model.

What you need to know

Key changes and Timelines:

  • March 6, 2026: If you are using the -latest alias, please note that we will switch to Gemini 3.1 Pro Preview (gemini-3.1-pro-preview).

  • March 9, 2026: We’ll discontinue Gemini 3 Pro Preview in favor of our latest Gemini model, Gemini 3.1 Pro Preview. To avoid service disruption, please migrate to Gemini 3.1 Pro Preview (gemini-3.1-pro-preview) before March 9, 2026.

Thanks for choosing Google AI Studio and Gemini API!

6 Likes

It’s a shame that some of these models are being depreciated. I was using gemini-2.5-flash-lite-preview-09-2025. for a specific task in my app because it was the only one that could accurately and consistently give me the output/response needed without hallucinations. Gemini 3 flash hallucinates 90% of the time and has cost millions of tokens in bad responses for the same simple task (thousands of logs back this up). I’ve been trying 3 flash in other tasks of the app and the only thing that it can consistently produce error free is svg. gemini 3.1 would be to cost prohibitive and in testing the past few days the latency and outputs are awful for the specific use cases.

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Hello. Can someone please instruct how to do this migration exactly? And if it’s not done will i lose access to my project on google AI studio or what exactly?

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I’m also interested in the answer to this question.

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Gemini 3.1 Pro API is not at all available, no matter how many times I tried. That was not the case with 3 Pro. You are forcing us to use a new model but you don’t make sure it is working properly.

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Sad news.

Gemini 3 Pro Preview is much better for my use case (writing scenarios).

I’m sure 3.1 pro is better in coding and mathematics, but it’s much worse in writing, especially in humor. It’s just not optimized for this sort of things, maybe less common.

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We have an Android app that calls Gemini through okHttp, after I migrated to 3.1 pro preview, I always run into timeout issue. I had same problem with 3 pro preview. This is a blocker for us. I also posted a question in YAQ. How can I get help?

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Hi, according to this page: https://ai.google.dev/gemini-api/docs/models#preview
Preview models are given at least two weeks notice between deprecation and shutdown. However, the deprecation of Gemini 3 Pro Preview was announced on February 26: https://ai.google.dev/gemini-api/docs/changelog, which is less than two weeks before the planned March 9 shutdown date. (two weeks later would be the 12th). I am requesting that the shutdown be delayed until at least March 12 in order to comply with the policy and to give users more time to migrate. Thank you.

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Hi @Marwa_Chehabeddine , The project, API keys, and saved prompts in AI Studio will remain intact. However, after March 9, any code or saved prompts pointing to gemini-3-pro-preview will return an error. We recommend updating any code or saved prompts in AI studio that uses gemini-3-pro-preview to use gemini-3.1-pro-preview and verify the output still meets your requirements. Hope this helps!

@Sajid_Mishal_PK Can you share more about the errors you are running into while trying to use 3.1 Pro? Are you using it via AI Studio or the API?

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No. Why are you removing a genuinely good model?

For me, Gemini 3.0 Pro is FAR better for creativity and storytelling. It is more expressive, more emotionally capable, and far more natural in long-form creative work.

Google’s recent trajectory feels increasingly negative. First, free quotas in AI Studio were reduced. Cross-subscription access between Gemini Pro and AI Studio was never implemented. Now you are planning to remove the best model many of us have worked with and replace it with a drier, more heavily constrained 3.1 Pro.

At what point does this stop being “progress” and start becoming regression?

It genuinely feels like creative users are being pushed away. Competitors at least provide access to their strongest models within a single subscription tier and preserve access to previous versions. Here, older models disappear, subscription access remains limited to a constrained app experience, and AI Studio remains financially impractical for non-commercial users.

I am not using the model for commercial API workloads. I am not building infrastructure. I am using it for personal creative work - writing, roleplay, emotionally nuanced storytelling.

I have always valued Gemini for two things: its large context window and its relatively open, balanced moderation that allowed meaningful creative exploration. That balance made it powerful.

But the current trend is worrying. First, accessibility to AI Studio was reduced. Then subscription parity was delayed. Now censorship appears stricter in newer models, reducing emotional depth and creative freedom.

If 3.0 Pro is removed in favor of a more restricted 3.1 Pro, many creative users will see this not as an upgrade, but as a downgrade.

Please reconsider removing 3.0 Pro entirely. At the very least, preserve access to it for users who prefer its creative behavior.

Because replacing a model that feels alive with one that feels sanitized and flattened is not innovation. It is erosion of trust.

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This is unbelievable news. Even 2.5 Pro lasts a little longer — why shutting down the 3.0 Pro model so early? 3.0 Pro and 3.1 Pro have completely different styles, and frankly, 3.1 performs very poorly for my language (Japanese) compared to 3.0Pro. There are other problems as well like the potential violation of the policy https://ai.google.dev/gemini-api/docs/models?#preview and evident regression in EQ-Bench3 benchmark. Please reconsider as others point out.

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Tier 3 here, and receiving only UNAVAILABLE errors when calling 3.1 Pro, for days. It’s crazy to deprecate a model that was working, to replace it by an unusable model.

google.genai.errors.ServerError: 503 UNAVAILABLE. {‘error’: {‘code’: 503, ‘message’: ‘This model is currently experiencing high demand. Spikes in demand are usually temporary. Please try again later.’, ‘status’: ‘UNAVAILABLE’}}

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But how do I know my code was calling for what exactly. I used different models at different times. My default was 2.5 flash, but when i had errors and times out i switched a little to 3.0. So i don’t understand how do i know which used what. M not ab expert so please if you can help its appreciated

I want to add something important after spending more time testing both 3.0 Pro and 3.1 Pro side by side.

They do not replace each other.
They complement each other.

Gemini 3.0 Pro feels more alive. More emotionally fluid. It is better at “igniting” a scene, setting tone, establishing atmosphere, building momentum in storytelling. It is excellent at creating movement inside the narrative - it gives energy to the context.

Gemini 3.1 Pro, on the other hand, often shines once that context already exists. It adapts to the established tone, deepens interactions, expands details, refines structure, and stabilizes the flow.

Used together - alternating between them — they actually work like two dancers.

3.0 sets the rhythm.
3.1 refines the choreography.

When I switch between them in a mixed workflow, the result is noticeably stronger than using either one alone. 3.0 pushes creativity forward. 3.1 sharpens and elaborates.

Removing 3.0 Pro would not be an upgrade. It would remove a unique creative engine that plays a distinct role in the overall experience.

Not every model needs to replace the previous one. Sometimes evolution should mean expansion, not erasure.

If 3.1 is meant to be the successor, that is fine. But 3.0 has a personality and creative behavior that is not replicated. It brings something distinct to the ecosystem.

For users who work in storytelling, long-form dialogue, emotionally layered interactions, or roleplay, that distinction matters.

Please reconsider discontinuing 3.0 Pro entirely. At minimum, allow it to remain available alongside 3.1 Pro.

Because in practice, they are not duplicates.

They are partners.

And removing one of them reduces the whole performance.

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Is it a joke?

Gemini 3.1 preview and Gemini 3 flash preview are a nightmare!

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ممتاز .اذا امكن تضاف اليه بعض الميزات كقتراح لأكثر من نموذج و الموازنة بينها.تمديد مرحلة التجربة حتى يثرى الموضوع بالكثير من الاقتراحات

Why do you have to shut down gemini 3 pro when it was actually good? Gemini 3.1 pro sucks especially when it has to help me with my literature stuff why do you all only focus on science and maths students and don’t care about literature???

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I have to agree with this friend over here, I especially like 3.0 over its creative solutions and application of existing sources over 3.1 and 2.5

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