[Bug] Tab key doesn't toggle thinking mode; always enabled on startup

[HanyuMasashi-AB]

Bug Description Title: Tab key not working to toggle thinking mode, always enabled on startup (v2.0.67)

Description:

• Version: 2.0.67
• OS: Windows
• Model: Sonnet 4.5 (Default)

Bug:

1. Tab key no longer toggles extended thinking mode on/off
2. After startup, extended thinking is always enabled regardless of the setting in settings.json
3. Even when ~/.claude/settings.json contains "alwaysThinkingEnabled": false, thinking mode is always on
4. This causes unexpectedly high token consumption

Expected behavior:

• Tab key should toggle thinking mode on/off
• settings.json configuration should be respected on startup

Additional info:

• /config shows "Thinking mode: true" after every restart
• Input bar color indicates thinking is always enabled (purple instead of gray)

Environment Info

• Platform: win32
• Terminal: null
• Version: 2.0.67
• Feedback ID: 9b9cb90c-1d25-4bd2-a41b-01d89d25da9e

Errors

[]

[github-actions[bot]]

Found 3 possible duplicate issues:

1. https://github.com/anthropics/claude-code/issues/13759
2. https://github.com/anthropics/claude-code/issues/13806
3. https://github.com/anthropics/claude-code/issues/13768

This issue will be automatically closed as a duplicate in 3 days.

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🤖 Generated with Claude Code

[andreaganduglia]

Confirmed on v2.0.67 Linux.

[vanek-21-code]

Even when turned off from the config, it always becomes enabled on a new startup.

[andreaganduglia]

Correct.

[rrcobb]

Also seeing this behavior! It's pretty irritating.

[fadedlamp42]

It's pretty irritating

More than irritating, I'd like to more publicly suggest that this is an intentional, insidious trend. See my submission of the issue, I'm quite relieved it wasn't just me being paranoid about some glitch.

[Letiliel]

Anthropic reply here: https://github.com/anthropics/claude-code/issues/13759#issuecomment-3649001782

[zxzinn]

You can add this to ~/.claude/settings.json:

{
  "env": {
    "MAX_THINKING_TOKENS": "0"
  }
}

This disables thinking mode completely even toggled in /config, but this is a temporary workaround for people who don't want thinking by default, if you want to toggle thinking again you need to remove this configuration.

[github-actions[bot]]

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.