Unable to set thinking level or context for Opus 4.7

Support Bug Reports
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Same issue here!: Where does the bug appear (feature/product)?

:check_box_with_check: Cursor IDE

Describe the Bug

When using the Opus 4.7 model in Cursor IDE, the “Thinking” mode cannot be disabled and the reasoning effort selector (Low / Medium / High / Extra High) becomes stuck on “Extra High”.

The UI appears frozen/non-responsive:

  • Clicking the Thinking toggle does nothing

  • Clicking different effort levels does nothing

  • The selected state remains forced on “Extra High”

  • The issue persists across chats

This seems specific to Opus 4.7. Other models behave normally.

Steps to Reproduce

  1. Open Cursor IDE

  2. Start a new chat/composer session

  3. Select the model “Opus 4.7”

  4. Open the reasoning/thinking settings

  5. Attempt to:

    • disable Thinking

    • change effort from “Extra High” to another level

  6. Observe that:

    • the toggle does not respond

    • effort selection does not change

    • “Extra High” remains forced

Expected Behavior

Users should be able to:

  • toggle Thinking mode on/off

  • switch reasoning effort between Low / Medium / High / Extra High

The UI should reflect the selected state correctly and respond to user input.

Screenshots / Screen Recordings

Attached screenshots showing:

  • Cursor version information

  • macOS system information

Operating System

:check_box_with_check: MacOS

Version Information

IDE:
Version: 3.3.22
VSCode Version: 1.105.1
Commit: 38a27120cfc7419a5efa38420665eaeeed1e7b30

Electron: 39.8.1
Chromium: 142.0.7444.265
Node.js: 22.22.1
OS: Darwin arm64 24.6.0

Device:
MacBook Air M1 (2020)
16 GB RAM
macOS Sequoia 15.6

For AI issues: which model did you use?

Model: Opus 4.7

For AI issues: add Request ID with privacy disabled

Request ID: (paste request ID here)

Additional Information

  • Restarting Cursor does not consistently fix the issue

  • Creating a new chat sometimes does not help

  • The issue appears only with Opus 4.7

  • Other models do not appear affected

  • This may be related to the new adaptive thinking implementation introduced for Opus 4.7

  • Several users appear to report related issues involving stuck reasoning controls or missing effort selectors in recent Cursor builds

  • Issue observed on stable build track

Does this stop you from using Cursor?

:check_box_with_check: Sometimes - I can sometimes use Cursor