[BUG] `alwaysThinkingEnabled: true` in settings.json does not enable thinking mode by default on Bedrock

[RP4nda13]

Preflight Checklist

• I have searched existing issues and this hasn't been reported yet
• This is a single bug report (please file separate reports for different bugs)
• I am using the latest version of Claude Code

What's Wrong?

alwaysThinkingEnabled: true in ~/.claude/settings.json does not enable
thinking mode by default when starting a new session on Bedrock. The setting is
ignored silently.

Additionally, enabling thinking mode via /config only takes effect for the
current session and does not persist across sessions.

Alt+T toggle works correctly within a session.

Steps to reproduce

1. Add "alwaysThinkingEnabled": true to ~/.claude/settings.json
2. Start a new Claude Code session
3. Thinking mode is OFF
4. Enable thinking mode via /config
5. Exit session and start a new session
6. Thinking mode is OFF again

Environment

• Claude Code version: 2.1.42
• Provider: Amazon Bedrock
• Model: Application Inference Profile (Opus 4.6)
• OS: Ubuntu 22.04 (Linux 6.8.0-1044-aws)
• Node.js: v22.19.0

settings.json

{
  "env": {
    "CLAUDE_CODE_USE_BEDROCK": "1",
    "AWS_REGION": "ap-northeast-1",
    "ANTHROPIC_MODEL":
"arn:aws:bedrock:ap-northeast-1:...:application-inference-profile/..."
  },
  "language": "japanese",
  "alwaysThinkingEnabled": true
}

Notes

• Changelog v2.0.67: "Thinking mode configuration has moved to /config"
• Changelog v2.0.72: "Fix thinking mode toggle in /config not persisting
  correctly"
• Despite these fixes, the issue still persists in v2.1.42 on Bedrock

What Should Happen?

• alwaysThinkingEnabled: true in settings.json should enable thinking mode by
  default on session start
• /config thinking mode toggle should persist across sessions
• Both methods should work consistently on Bedrock, same as on direct Anthropic
  API

Error Messages/Logs

Steps to Reproduce

Steps to reproduce

1. Add "alwaysThinkingEnabled": true to ~/.claude/settings.json
2. Start a new Claude Code session
3. Thinking mode is OFF
4. Enable thinking mode via /config
5. Exit session and start a new session
6. Thinking mode is OFF again

Environment

• Claude Code version: 2.1.42
• Provider: Amazon Bedrock
• Model: Application Inference Profile (Opus 4.6)
• OS: Ubuntu 22.04 (Linux 6.8.0-1044-aws)
• Node.js: v22.19.0

settings.json

{
  "env": {
    "CLAUDE_CODE_USE_BEDROCK": "1",
    "AWS_REGION": "ap-northeast-1",
    "ANTHROPIC_MODEL":
"arn:aws:bedrock:ap-northeast-1:...:application-inference-profile/..."
  },
  "language": "japanese",
  "alwaysThinkingEnabled": true
}

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

No response

Claude Code Version

2.1.42 (Claude Code)

Platform

AWS Bedrock

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Other

Additional Information

No response

[github-actions]

Found 3 possible duplicate issues:

1. [BUG] alwaysThinkingEnabled setting not respected since v2.0.64 #13532
2. [BUG] Thinking mode setting in settings.json not persisted across sessions #13768
3. [BUG] Settings not applied: alwaysThinkingEnabled ignored and inconsistent permission behavior #10623

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

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[github-actions]

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.