opencode Diffs invisible on light mode, regardless of theme

Description

Hi, edits have become illegible on my light-mode terminal. All/most diffs colors seem to be baked to white, so only on dark backgrounds they become legible.

Here using the GitHub theme,

OpenCode version

1.0.121

Steps to reproduce

No response

Screenshot and/or share link

No response

Operating System

Debian 12

Terminal

xcfe4-terminal

Nov 30 '25 23:11 gabrielmontagne

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

#4666: Bug: Highlighted text invisible with transparent custom themes
#4427: System theme (regression in 1.0.69 with foreground text rendering issues)

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

Nov 30 '25 23:11 github-actions[bot]

Got the same problem. Using opencode v1.0.125, Ghostty 1.2.3, macOS Sequoia 15.7.1

Dec 01 '25 16:12 akronb

I think this is the same problem that I'm having, except I can't see anything at all, my install is mostly unusable.

This is 1.0.127; switching between "light mode" and "dark mode" in the menu doesn't do anything.

If I switch the whole system to light mode, it is still extremely low contrast:

Dec 03 '25 02:12 awwright

What terminal and theme are you using?

Dec 03 '25 04:12 rekram1-node

In my case I'm using catppuccin latte for both iterm2 and opencode.

Dec 03 '25 17:12 nesl247

@rekram1-node Just the "System" theme, but no theme is readable. This is the "solarized" theme:

Dec 03 '25 18:12 awwright

This looks like you are using terminals that do not support truecolor (xcfe4-terminal and built-in macos terminal before Sequoia). Opentui and therefor opencode does currently not support non-truecolor terminals. This will come, but might be a while. In the mean time I can only suggest you use a terminal that supports truecolor like Ghostty, Kitty, Alacritty, iTerm2 etc.

Dec 05 '25 13:12 kommander

@kommander I'm using Ghostty 1.2.3 with the Alabaster theme and macOS Sequoia 15.7.1, but I still can't see diffs for some files. I've tried changing Ghostty and opencode themes, but the result is still the same.

I have no problem with .md files, but diffs for .sql, .sh, .dbml are invisible. Maybe there is the same issue with different files, but I didn't check that.

Also, I can't see the title in the "Rename session" dialog.

Dec 05 '25 14:12 akronb

This is so weird, in ghostty it works fine for me for anything that does not have a parser like .vim files.

Can you try with bunx opencode-ai@snapshot-kmdr-debug?

Dec 05 '25 22:12 kommander

This looks like you are using terminals that do not support truecolor (xcfe4-terminal and built-in macos terminal before Sequoia). Opentui and therefor opencode does currently not support non-truecolor terminals. This will come, but might be a while. In the mean time I can only suggest you use a terminal that supports truecolor like Ghostty, Kitty, Alacritty, iTerm2 etc.

Hi, I tried, with Alacritty, but no luck,

this is the GitHub theme, running opencode 1.0.134.

Dec 06 '25 01:12 gabrielmontagne

Did you try running bunx opencode-ai@snapshot-kmdr-debug?

Dec 06 '25 02:12 kommander

Did you try running bunx opencode-ai@snapshot-kmdr-debug?

I'm testing bunx opencode-ai@snapshot-kmdr-debug OS: macOS Tahoe 26.0.1 Host: MacBook Air M1, 2020 Shell: zsh 5.9 Terminal: ghostty 1.2.3 COLORTERM: truecolor (tested with echo $COLORTERM) Using the OpenCode theme here The tested file has no extension (bash script)

It was reproduced

I changed the dark/light by "toggle appearance"

I asked them to cat the file in plan mode.

Also, I see a similar issue with "no matching items"

Dec 06 '25 08:12 koichincom

@kommander I've tried your snapshot, but the result is still the same. It works on write, but it's unreadable on edit. Here are screenshots from opencode-ai@snapshot-kmdr-debug