gemini-2.5-flash-lite-preview-09-2025 model retirement
Stopped workingSubscribe to Gemini APIShare
Calls to the model gemini-2.5-flash-lite-preview-09-2025 stopped working on March 31, 2026.
The error you get
What Gemini API answers a call to gemini-2.5-flash-lite-preview-09-2025 once the model is gone, as recorded from real responses:
{"error":{"code":404,"message":"This model models/gemini-2.5-flash-lite-preview-09-2025 is no longer available to new users. Please update your code to use a newer model for the latest features and improvements.","status":"NOT_FOUND"}}{"error":{"code":404,"message":"models/gemini-2.5-flash-lite-preview-09-2025 is not found for API version v1beta, or is not supported for generateContent. Call ModelService.ListModels to see the list of available models and their supported methods.","status":"NOT_FOUND"}}What to use instead of gemini-2.5-flash-lite-preview-09-2025
Move to gemini-3.5-flash-lite. gemini-3.1-flash-lite, named first, stops working on 2027-05-07.
In Gemini API's words
Model: gemini-2.5-flash-lite-preview-09-2025; Release date: September 25, 2025; Shutdown date: March 31, 2026; Recommended replacement: gemini-3.1-flash-lite
Facts
- API
- Gemini API
generativelanguage.googleapis.com - Model
gemini-2.5-flash-lite-preview-09-2025- Released
- September 25, 2025 (models.dev)
- Kind
- Model retirement
- Takes effect
- March 31, 2026
- Calls after that day
- Fail
- Source
- Deprecations page
- Last updated
- Verified
- , against Gemini API's own pages
Questions
When does gemini-2.5-flash-lite-preview-09-2025 shut down?
Calls to the model gemini-2.5-flash-lite-preview-09-2025 stopped working on March 31, 2026.
What happens to calls after March 31, 2026?
They have failed since March 31, 2026.
What error does gemini-2.5-flash-lite-preview-09-2025 return once it is shut down?
Gemini API answers HTTP 404: "This model models/gemini-2.5-flash-lite-preview-09-2025 is no longer available to new users. Please update your code to use a newer model for the latest features and improvements.". Send another model to fix it.
When was gemini-2.5-flash-lite-preview-09-2025 released?
gemini-2.5-flash-lite-preview-09-2025 was released on September 25, 2025, according to models.dev.
How do I find the calls this hits in my code?
Okapi reads your repository, finds the calls this change hits and opens a pull request with the fix. It never commits to your branches: every change comes as a pull request you review.
gemini-2.5-flash-lite-preview-09-2025 on other APIs 2
-
Vertex AI
gemini-2.5-flash-lite-preview-09-2025Model retirement Stopped working -
No date
Nano-gpt
gemini-2.5-flash-lite-preview-09-2025Model retirement Deprecated, no date
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You fixed this one by hand.
Okapi opens the pull request with the fix before the next breaking change reaches your code.