Last command model is selected after exit and resume

[madflow]

Description

I have a /commit command configured to use a specific model:

---
description: Create a git commit
model: opencode/deepseek-v4-flash-free
---

My default model is configured as follows:

{
  "$schema": "https://opencode.ai/config.json",
  "model": "openai/gpt-5.6-sol"
}

I start a session using openai/gpt-5.6-sol, then run the /commit command.

After closing the session with /exit and resuming it through /sessions, the session model is incorrectly set to opencode/deepseek-v4-flash-free, which is the model used by the /commit command.

I expect the resumed session to continue using its original model, openai/gpt-5.6-sol.

Steps to Reproduce

1. Start a session using openai/gpt-5.6-sol.
2. Run the /commit command.
3. Close the session using /exit.
4. Run /sessions and resume the previous session.
5. Observe that the selected model is opencode/deepseek-v4-flash-free instead of openai/gpt-5.6-sol.

Expected Behavior

The resumed session should use the session's original model: openai/gpt-5.6-sol.

Actual Behavior

The resumed session uses the model assigned to the most recently executed command: opencode/deepseek-v4-flash-free.

Plugins

None

OpenCode Version

1.18.3

Operating System

macOS Tahoe

Terminal

Ghostty

Screenshot or Share Link

None

[github-actions]

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

• stale synthetic continuation rows can overwrite the session model #33044: Stale synthetic continuation rows can overwrite the session model — describes a similar problem where session resume ends up using a wrong/fallback model instead of the original user-selected model
• Model ID auto-switches silently during session #28842: Model ID auto-switches silently during session — covers the broader pattern of the session model unexpectedly changing, including at restart/resume time