What changed
Time to bail on Gemini 2.5 models on Vertex AI? Act. You can stay. Gemini 2.5 Pro, Flash and Flash-Lite retire on October 20, 2026. Switch to a newer model.
On our scale this is Act: change a setting or plan before the date. You can stay.
Google retires Gemini 2.5 Pro, Flash and Flash-Lite on Vertex AI on October 20, 2026. Google now calls Vertex AI the Agent Platform. Apps must switch to a newer model first.
Here are the facts we checked:
- Retirement date: October 20, 2026 (Google Cloud)
- Models that retire: gemini-2.5-pro, gemini-2.5-flash and gemini-2.5-flash-lite (Gemini 2.5 Pro, Flash, Flash-Lite) (Google Cloud)
- Google's picks for 2.5 Pro: gemini-3.8-flash or gemini-3.5-flash (Google Cloud)
- Google's picks for 2.5 Flash: gemini-3.8-flash, gemini-3.5-flash-lite or gemini-3.1-flash-lite (Google Cloud)
- Google's picks for 2.5 Flash-Lite: gemini-3.8-flash, gemini-3.1-flash-lite or Gemma 4 (Google Cloud)
- Careful: a newer model also retires soon: gemini-3.6-flash retires November 19, 2026 (Google Cloud)
- Retirement date for the newest Flash model: gemini-3.8-flash: none announced yet (Google Cloud)
- Other picks retire: gemini-3.5-flash: May 19, 2027 or later; gemini-3.1-flash-lite: May 7, 2027 or later (Google Cloud)
- Can the date move earlier?: No. Google says dates may be extended, but not moved earlier (Google Cloud)
- If you do nothing: Calls to a retired model can fail with errors; Google says to update to a newer model (Google Cloud)
- What Google calls Vertex AI now: Gemini Enterprise Agent Platform (Agent Platform for short) (Google Cloud)
- Apps that call Gemini 2.5 on Vertex AI: Must move to another model by October 20, 2026 (Google Cloud)
You can stay on Gemini Enterprise Agent Platform. You have to change a setting or plan before the date.
Leaving is a choice here, not a must.
Google Cloud is the main source for this page. Gemini Enterprise Agent Platform has not said more than what is listed here. If a fact is not on this page, we do not know it yet.
Who is affected
Apps that call Gemini 2.5 on Vertex AI: Must move to another model by October 20, 2026.
The date to remember is October 20, 2026. Make the change before then.
What to do before October 20
- Find every call to a 2.5 model. Search your code and settings for gemini-2.5-pro, gemini-2.5-flash and gemini-2.5-flash-lite.
- Pick a model with a later date. Google lists gemini-3.8-flash for all three. Skip gemini-3.6-flash: it retires November 19, 2026.
- Test, then ship. Run your usual prompts on the new model. Check the output format, speed and cost. Ship before October 20.
A few tips:
- Make the change yourself before the date. Do not wait for the last reminder email.
- Write down your current plan or settings first, so you can compare after the change.
- After the change, open your settings again and check that it worked.
How to tell your users
If the change affects your members or team, send one short email. Say what changes for them and when. Put the most important line first.
If there is a date, send a short reminder a few days before it. Keep a copy of the list you sent it to.
Options people mention
Listed for convenience. Not ranked. Not paid. These names come up in threads and reviews; that does not show where people moved.
Before you pay, check the price page of each tool yourself. Prices change, and we only list what our sources say.
Questions people ask
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Sources