Vertex AI · Model retirement
chat-bison
Stopped working
Calls to the model chat-bison on Vertex AI stopped working on April 21, 2025.
What to use instead of chat-bison
Move to gemini-3.8-flash. gemini-2.5-flash-lite, named first, stopped working on 2026-10-20.
Facts
- API
- Vertex AI
aiplatform.googleapis.com - Model
chat-bison- Kind
- Model retirement
- Takes effect
- April 21, 2025
- Calls after that day
- Fail
- Source
- Deprecations page
- Last updated
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