[BUG] Thinking display not working in web UI

[SOUMITRO-SAHA]

Description

The thinking/reasoning display feature works correctly in the TUI (Terminal User Interface) but does not work in the web UI. The collapsible "Thinking" container with reasoning summaries does not appear in the timeline when using the web interface.

Plugins

No response

OpenCode version

1.3.13

Steps to reproduce

1. Start OpenCode with a model that supports reasoning/thinking (e.g., Claude with extended thinking)
2. Send a message that triggers model reasoning
3. Observe in TUI: Thinking container appears.
4. Open web UI in browser
5. Observe in web UI: Thinking container does not appear / thinking is not displayed

Screenshot and/or share link

Operating System

macOS 26.3.1

Terminal

zed terminal, Ghostty

[github-actions]

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

• Opencode Web: Thinking is not differentiable from main #14340: Similar report of thinking not being properly displayed in the web UI (collapsible thinking container missing/not differentiable)

If this is a different issue (e.g., thinking content is entirely absent vs. not visually distinct), please add more context to help distinguish it.