[BUG] Opus 4.5 overuses markdown tables

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?

Opus 4.5 overuses markdown tables in conversational output, which results in difficult to read output due to those tables wrapping when terminal width is smaller than the width of that table. This makes it difficult to read.

What Should Happen?

Opus 4.5 should use bullet point lists, paragraph text, or other output style that is less dependent on terminal width to be readable.

Error Messages/Logs

Steps to Reproduce

Screenshot:

<img width="857" height="221" alt="Image" src="https://github.com/user-attachments/assets/0c797a3c-ada7-49f0-bf00-a79ef134293a" />

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

before Opus 4.5

Claude Code Version

2.0.56

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_