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When use vertex models (like gemini 3 pro perview) no session name generated. #3321

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opened 2026-02-16 17:39:38 -05:00 by yindo · 2 comments
yindo commented 2026-02-16 17:39:38 -05:00
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Originally created by @SKozar on GitHub (Dec 4, 2025).

Originally assigned to: @thdxr on GitHub.

Description

No session name generated when vertex ai models used (tried gemini 3 pro preview, gemini 2.5 pro)

OpenCode version

1.0.133

Steps to reproduce

  1. Add vertex ai auth login.
  2. start new session
  3. select gemini 3 pro preview model
  4. run prompts

Screenshot and/or share link

Image

Operating System

macOS 15.7.2

Terminal

iTerm2

Originally created by @SKozar on GitHub (Dec 4, 2025). Originally assigned to: @thdxr on GitHub. ### Description No session name generated when vertex ai models used (tried gemini 3 pro preview, gemini 2.5 pro) ### OpenCode version 1.0.133 ### Steps to reproduce 1. Add vertex ai auth login. 2. start new session 3. select gemini 3 pro preview model 4. run prompts ### Screenshot and/or share link <img width="1706" height="934" alt="Image" src="https://github.com/user-attachments/assets/ff6de9c8-38d8-4af5-b0bd-b02408d1240d" /> ### Operating System macOS 15.7.2 ### Terminal iTerm2
yindo added the bug label 2026-02-16 17:39:38 -05:00
yindo commented 2026-02-16 17:39:38 -05:00
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@github-actions[bot] commented on GitHub (Dec 4, 2025):

This issue might be a duplicate of existing issues. Please check:

  • #4040: Session auto naming - Reports that sessions fail to auto-name for certain providers (bedrock, azure) due to small model selection issues. Vertex AI appears to have the same root cause
  • #4632: Gemini 3 pro preview issues - Specifically mentions that sessions are not automatically renamed when using google-vertex/gemini-3-pro-preview

Feel free to ignore if none of these address your specific case.

@github-actions[bot] commented on GitHub (Dec 4, 2025): This issue might be a duplicate of existing issues. Please check: - #4040: Session auto naming - Reports that sessions fail to auto-name for certain providers (bedrock, azure) due to small model selection issues. Vertex AI appears to have the same root cause - #4632: Gemini 3 pro preview issues - Specifically mentions that sessions are not automatically renamed when using google-vertex/gemini-3-pro-preview Feel free to ignore if none of these address your specific case.
yindo commented 2026-02-16 17:39:38 -05:00
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@rekram1-node commented on GitHub (Dec 4, 2025):

we are gonna have a fix soon, for now set:

small_model in your opencode config

Basically for most providers we can infer a cheaper model but things like azure bedrock vertex we cant so it silently fails rn

@rekram1-node commented on GitHub (Dec 4, 2025): we are gonna have a fix soon, for now set: small_model in your opencode config Basically for most providers we can infer a cheaper model but things like azure bedrock vertex we cant so it silently fails rn
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Reference: anomalyco/opencode#3321
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