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Opus 4.5 outputting garbled characters while trying to draw schematics and file structure #6529

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opened 2026-02-16 18:04:30 -05:00 by yindo · 2 comments
yindo commented 2026-02-16 18:04:30 -05:00
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Originally created by @henrythor on GitHub (Jan 16, 2026).

Originally assigned to: @fwang on GitHub.

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

Image Image

Operating System

macOS 26.2 (25C56)

Terminal

WezTerm 20251014-193657-64f2907c

Originally created by @henrythor on GitHub (Jan 16, 2026). Originally assigned to: @fwang on GitHub. ### 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 <img width="1497" height="933" alt="Image" src="https://github.com/user-attachments/assets/51689fcb-a444-4c3a-a855-6788f5fd4124" /> <img width="1512" height="953" alt="Image" src="https://github.com/user-attachments/assets/fa08ca6f-c67c-46f2-9826-65c046215bf5" /> ### Operating System macOS 26.2 (25C56) ### Terminal WezTerm 20251014-193657-64f2907c
yindo added the bugzen labels 2026-02-16 18:04:30 -05:00
yindo closed this issue 2026-02-16 18:04:30 -05:00
yindo commented 2026-02-16 18:04:30 -05:00
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@github-actions[bot] commented on GitHub (Jan 16, 2026):

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

  • #7933: Encoding problem with EUC-KR to UTF-8 conversion affecting text display
  • #4320: Characters are encoding gibberish all over the frontend (TUI rendering issue)
  • #7484: Question tool fails to parse JSON with non-ASCII characters (UTF-8 encoding issue)
  • #5763: Unicode character in line causing rendering to count characters incorrectly
  • #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.

@github-actions[bot] commented on GitHub (Jan 16, 2026): This issue might be a duplicate of existing issues. Please check: - #7933: Encoding problem with EUC-KR to UTF-8 conversion affecting text display - #4320: Characters are encoding gibberish all over the frontend (TUI rendering issue) - #7484: Question tool fails to parse JSON with non-ASCII characters (UTF-8 encoding issue) - #5763: Unicode character in line causing rendering to count characters incorrectly - #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.
yindo commented 2026-02-16 18:04:30 -05:00
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@fwang commented on GitHub (Jan 16, 2026):

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

@fwang commented on GitHub (Jan 16, 2026): @henrythor fixed - no need to update. Feel free to reopen if u run into it again.
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Reference: anomalyco/opencode#6529
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