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

[SKozar]

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

Operating System

macOS 15.7.2

Terminal

iTerm2

[github-actions]

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

• Session auto naming #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
• Gemini 3 pro preview issues #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.

[rekram1-node]

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