Description

When a model/variant is selected during initial setup, opencode stores it in the session SQLite database (~/.local/share/opencode/opencode.db) as:

{"id":"deepseek-v4-pro","providerID":"deepseek","variant":"high"}

After this, changing variant in opencode.json agent config has no effect — the session DB value silently overrides the config file.

Steps to Reproduce

1. Start opencode, select a model with variant (e.g., deepseek/deepseek-v4-pro with high)
2. Edit ~/.config/opencode/opencode.json:

   "agent": {
     "build": {
       "model": "deepseek/deepseek-v4-pro",
       "variant": "max"
     }
   }

3. Restart opencode — variant remains high (from DB), ignoring config

Expected Behavior

1. Config file variant should take effect, or
2. UI should warn that session-level model lock overrides config, or
3. Provide a way to trigger model/variant re-selection (e.g., /model command or settings UI)

Workaround

Manually update the session record in opencode.db:

UPDATE session SET model = {"id": "deepseek-v4-pro", "providerID": "deepseek", "variant": "max"} WHERE id = <session_id>;

Related

• Same-model agents do not preserve agent-local variant at runtime #27790 Same-model agents do not preserve agent-local variant at runtime
• wont select variant on fresh start #21200 wont select variant on fresh start
• Command to switch to specific model / switch between model sets #20293 Command to switch to specific model