OpenCode v1.14.21: LSP Diagnostics, C# Roslyn, Session Compaction
OpenCode v1.14.21 brings LSP diagnostic support for C# and Kotlin, switches to Roslyn for C# language server, improves session compaction for long threads, and fixes project detection for bare Git repos.
TL;DR
- LSP diagnostic support for C# (now using Roslyn) and Kotlin
- Better session compaction keeps more context in long threads
- Fixed project detection for bare Git repos and worktrees
- UTF-8 BOM preservation when editing files
New
- LSP diagnostics from language servers — Pull diagnostics directly from LSP servers including C# and Kotlin for better inline error reporting
- Roslyn Language Server for C# — Replaced csharp-ls with Roslyn for improved C# support and diagnostics
- Mistral Small reasoning variant — Added high reasoning option for supported Mistral Small models
Fixed
- Project detection for bare repos and worktrees — Fixed caching logic so bare Git repositories and worktrees are detected correctly
- Session compaction context retention — Improved algorithm so long threads preserve more useful context when older history is summarized
- UTF-8 BOM preservation — Files edited, patched, or rewritten through tools now keep their UTF-8 BOMs intact
- Invalid session handling — TUI now fails fast when opening missing or invalid sessions instead of starting in a broken state
- Upgrade check skip — Skip version upgrade checks when auto-update is disabled by the user
- Project avatar consistency — Avatar previews now match between sidebar and edit dialog
- Project icon overrides — Uploaded icons and color fallbacks now behave correctly in the edit dialog
- Linux desktop metadata — Improved app listings and categorization for Linux desktop environments
- Kimi model variants — Hide unsupported variants for Kimi models that don't expose them
Update via: opencode upgrade or download from GitHub releases
Source: OpenCode
