Opus 4.5 outputting garbled characters while trying to draw schematics and file structure

[henrythor]

Description

All of a sudden Claude Opus 4.5 stopped showing ascii art around objects it was trying to render in schematics or filestructure and started outputting âââââââââ

Plugins

none

OpenCode version

1.1.23

Steps to reproduce

1. Use Opencode Zen
2. Create a new session on Opus 4.5
3. Ask it to generate a schematic or a plan
4. Get garble

Screenshot and/or share link

Operating System

macOS 26.2 (25C56)

Terminal

WezTerm 20251014-193657-64f2907c

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• encoding problem #7933: Encoding problem with EUC-KR to UTF-8 conversion affecting text display
• Characters are encoding gibberish all over the frontend #4320: Characters are encoding gibberish all over the frontend (TUI rendering issue)
• [Bug] Question tool fails to parse JSON with French accented characters (UTF-8) #7484: Question tool fails to parse JSON with non-ASCII characters (UTF-8 encoding issue)
• Unicode character in line causing rendering to count characters incorrectly #5763: Unicode character in line causing rendering to count characters incorrectly
• Korean (Hangul) characters display as broken/garbled in input field #3493: Korean (Hangul) characters display as broken/garbled in input field

The garbled character pattern (â) you're seeing is typical of UTF-8 encoding/decoding issues. These related issues suggest this may be a broader character encoding problem in the system.

Feel free to ignore if none of these address your specific case.

[fwang]

@henrythor fixed - no need to update. Feel free to reopen if u run into it again.