v1.2.8: Claude 4.6 Thinking Mode, MCP Call Visualization
Release Date: 2026-02-19
This version brings adaptive thinking support for Claude Sonnet 4.6, and visualization of custom tools and MCP calls in TUI.
🎯 One-Sentence Summary
Support for Claude 4.6 adaptive thinking; MCP tool call results are now visible and collapsible; desktop black screen issue fixed.
✨ New Features
🧠 Claude Sonnet 4.6 Adaptive Thinking
Added adaptive thinking support for Claude Sonnet 4.6 model.
How to use: When using Claude Sonnet 4.6, the model will automatically adjust thinking depth based on task complexity.
Who benefits: Users of Claude Sonnet 4.6, especially when handling complex tasks.
📊 MCP Call Result Visualization (TUI)
In TUI, responses from custom tools and MCP calls are now visible and collapsible.
How to use: When AI calls MCP tools, you can see the call results in the conversation, click to expand/collapse.
Who benefits: Users of MCP extensions, convenient for debugging and understanding tool execution.
🐛 Bug Fixes
Desktop Black Screen Issue
Fixed the issue where the desktop app would show a black screen after launching when using sidecar server.
Todos Cleanup
Todos list is now correctly cleared when aborting operations.
📊 Should You Upgrade?
| Situation | Recommendation |
|---|---|
| Using Claude Sonnet 4.6 | ✅ Highly recommended |
| Using MCP tools | ✅ Recommended |
| Desktop has black screen issue | ✅ Recommended |
| Everything works fine | ⚪ Optional upgrade |
⬆️ Upgrade Command
opencode upgrade📋 Technical Details
Click to expand original Release Notes
Core
- Support adaptive thinking for Claude Sonnet 4.6 (@tctev)
TUI
- Add custom tool and MCP call responses that are visible and collapsible (@yanosh-k)
Desktop
- Black screen on launch with sidecar server fixed
- Clear todos on abort
Thank you to 2 community contributors:
- @yanosh-k: feat(tui): add custom tool and mcp call responses visible and collapsable
- @tctev: feat(opencode): support adaptive thinking for claude sonnet 4.6