mux

This release adds Claude Opus 5, native Kimi K3, and Gemini 3.6 Flash support, plus project-less scratch chats and message queueing.

Models

• Claude Opus 5 support
• Native Kimi K3 support via a new Moonshot AI provider
• Gemini 3.6 Flash as the new default Gemini Flash model
• GPT-5.6: native reasoning controls, explicit prompt cache breakpoints for direct OpenAI, and corrected context limits over Codex OAuth

Chat

• Project-less scratch chats
• Messages sent during special sends queue up (FIFO) instead of erroring
• Stage arbitrary pasted/dropped files into the workspace from chat and the creation composer
• Mid-turn thinking-level changes apply at the next model step

Agents & tasks

• Sub-agent reports presented in chat, with incremental in-progress updates
• Sticky sub-agents that persist after reporting
• Skills refresh: invocation control, $ARGUMENTS, dynamic context, and .claude compatibility

UX

• Per-model cost breakdown in the workspace Costs tab
• Context sections split into a Stats Context sub-tab

Plus roughly 17 fixes across streaming, task management, MCP OAuth, and mobile layouts.

Full Changelog: https://github.com/coder/mux/compare/v0.28.0...v0.28.1