What's New
Features
- 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
Downloads
- macOS (Apple Silicon): 1Code-0.0.84-arm64.dmg
- macOS (Intel): 1Code-0.0.84.dmg
- Windows: 1Code Setup 0.0.84.exe
- Linux (AppImage): 1Code-0.0.84.AppImage
- Linux (deb): 21st-desktop_0.0.84_amd64.deb