GPT 5.4 model support — Added OpenAI's latest GPT 5.4 model as the new default for Codex runtime, replacing GPT-5.3 Codex
Copy button in text selection popover — Select any text in chat to quickly copy it with a new Copy icon button
Improvements & Fixes
Instant new chat creation — Creating a new sub-chat is now instant (optimistic UI update) instead of waiting for DB insert, with full rollback on failure
Double-click guard on new chat — Prevents duplicate sub-chats from rapid Cmd+T or double-clicking the new chat button
Race condition safety net — If a message is sent before the sub-chat row is persisted, the backend now auto-creates it instead of silently failing
Nested session error fix — Fixed "Claude Code cannot be launched inside another session" error when running the dev build from a Claude Code terminal
Changelog URL fix — Updated changelog links to point to the correct URL
Per-pane tab groups with native drag-and-drop — Each split pane now has its own tab bar with native DnD for reordering tabs, plus sidebar mode switching and Dockview improvements
Sortable sub-chats in sidebar — Drag-and-drop reordering of sub-chats in the sidebar using dnd-kit
Branch info in PR card — PR card badge now shows the branch name
Improvements & Fixes
Fork from here during active stream — Fixed: you can now fork a conversation while the agent is still streaming
SDK 0.2.63 compatibility — Fixed thinking config API usage and "Agent" tool name rename from claude-agent-sdk 0.2.63
Sub-chat rename toast — Fixed error toast appearing on rename by removing broken onSuccess callback
Sidebar tooltip cleanup — Tooltip now hides correctly on archive/close operations