[BUG] Thinking tags visible in output on Windows

Preflight Checklist

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

What's Wrong?

<thinking> The user can see my output now when I keep it simple. They want to test specific companies - funds - that don't have "total liabilities and equity" line. This is about testing the balance sheet mapping for financial companies or investment funds that have different structures.
Let me ask them for more details about what they want to test. </thinking>

OK. Do you have a specific fund ticker or CIK you want me to test?

What Should Happen?

Claude code has rendering issues. The tag part was displayed.

Error Messages/Logs

<thinking> The user can see my output now when I keep it simple. They want to test specific companies - funds - that don't have "total liabilities and equity" line. This is about testing the balance sheet mapping for financial companies or investment funds that have different structures. 
Let me ask them for more details about what they want to test. </thinking>

OK. Do you have a specific fund ticker or CIK you want me to test?

Steps to Reproduce

It just happened what I talked to Claude.

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

model ID claude-opus-4-5-20251101

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_