Model silently switches to "Auto" after Build Plan completes with Grok 4.5 manually selected

Support Bug Reports
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Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

When I manually select “Cursor Grok 4.5 High Fast” as the model and ask the agent to build a plan, the plan is generated correctly using Grok 4.5. However, as soon as the plan finishes generating, the model selector silently switches to “Auto” without any notification or my input. This happens consistently, every time a plan completes — it is not related to rate limits or usage caps, since it happens even when usage is well within limits. I have to manually reselect Grok 4.5 every time after a plan completes, which is disruptive to my workflow.

Steps to Reproduce

  1. Open a chat/agent conversation.
  2. Manually select “Cursor Grok 4.5 High Fast” from the model picker.
  3. Send a request that triggers plan generation (e.g., ask the agent to build a plan for a task).
  4. Wait for the plan to finish generating.
  5. Check the model selector — it has changed to “Auto” instead of staying on Grok 4.5.

Expected Behavior

The model selector should remain on the manually selected model (“Cursor Grok 4.5 High Fast”) after a plan completes, unless the user explicitly changes it or a rate limit/usage cap is hit. The model should never be silently switched without explicit user action or a clear on-screen notification explaining why.

Operating System

Windows 10/11

Version Information

Version: 3.11.25 (user setup)
VS Code Extension API: 1.125.0
Commit: fc2563ec93d793fc275eef734405a4fdf8b47b20
Date: 2026-07-15T01:27:41.754Z
Layout: IDE
Build Type: Stable
Release Track: Default
Electron: 40.10.3
Chromium: 144.0.7559.236
Node.js: 24.15.0
V8: 14.4.258.32-electron.0
xterm.js: 6.1.0-beta.256
OS: Windows_NT x64 10.0.26200

For AI issues: which model did you use?

Cursor Grok 4.5 High Fast (manually selected). Model automatically switches to “Auto” right after Build Plan completes.

Additional Information

This appears related to previously reported issues where subagent/plan-building flows override the manually selected model — e.g. forum threads on the “Explore Subagent Model” setting being overridden by the parent agent, and the “Cursor 4.7 Auto model selection” switching mid-project during high traffic. In my case, the switch happens specifically at the moment a Build Plan finishes generating, regardless of usage limits (usage was well under cap when this occurred). Reselecting Grok 4.5 manually after each plan completion works as a temporary workaround, but the switch happens every time without exception.

Does this stop you from using Cursor

No - Cursor works, but with this issue

5

Hey, thanks for the detailed report. This is a known bug. The manually selected model silently resets to Auto right after the Build Plan finishes. It’s not related to usage caps, and you were right to rule that out. I can’t share a fix timeline yet.

For now there’s one workaround. Re-select the model you want in the model picker right after the plan finishes, before you send it to build.

Just to avoid confusion, there’s a separate picker called model used to build this plan. It defaults to Inherit Agent Model and shows your chat model. That’s by design, and it’s not the same bug as the main picker reverting to Auto.

If you can, please send the Request ID from a session where the model flipped. chat menu in the top right > Copy Request ID. This will help us narrow it down. If I get an update on the fix, I’ll reply in the thread.