This release is a hotfix to restore terminal input functionality (see #1586)

Features

• Login with Mux Gateway is now live!
  If you have a coupon code you can still redeem them at https://gateway.mux.coder.com/
  When launching mux you can login to the gateway to automatically use the vouchers.

You can also join our discord to talk mux and request some tokens for testing!

Fixes

• improvements to review pane - file status, CRLF handling and inline review comments
• revamp of the provider menu for easier management of custom models

Full Changelog: v0.12.0...v0.12.1

🏙️ Highlights

We now support integrated terminals in the right sidebar, with drag-and-drop tiling and resizing:

Terminals persist on the backend, so mux server users can leave a tab, come back later, and resume the session exactly where they left off.

New runtime: Docker!

mux run has been given a makeover to make it useful for automation and CI. See:

• mux run docs
• Example GitHub Actions workflow

🛠️ Fixes

• Unified handling of environment variables (docs)
• Better default $PATH on macOS using common shell profiles (49176ed39)

Primarily a hotfix for 5dd8529 — fixing a rare bug where Anthropic reasoning would be effectively disabled sometimes on long-running chats.

Also, sneaks in e4e41f7 which embeds the Mux docs as a built-in skill. So, users can ask Mux about itself for support.

🌃 Highlights

Project now support customizable sections for organization:

You can share plans and other assistant outputs from Mux via the e2e encrypted mux.md:

Idle-compaction settings moved next to usage-based auto-compact slider:

When reaching a context exceeded error, we now give you a more useful retry operation if you have a model available with a higher context limit:

See also:

• Fully customizable Agents (docs)
• Mux can notify via new notify tool, just instruct via prompt (docs)
• Tool hooks! (docs)
• You can tag files with "@" in the chat which will include them in your context

🛠️ Fixes

• Fixed bug where SSH workspace sub-agents had unexpected git state (b4125da)
• Fixed thundering herd issue where enabling idle compaction could lead to dozens of old workspaces undergoing simultaneous compaction
  • New behavior: only one idle compaction runs at a time (f24db30)
• Many performance improvements all around the app

What’s Changed

🚀 Features

• Add a Keybinds section to Settings (improves discoverability of shortcuts).
• Add simulateFileModifyingToolEnd for UI testing.
• Add model-only TODO reminder notifications.
• Add VS Code secondary sidebar mux chat view (better VS Code integration).
• Add PTC subagent support plus compatibility improvements.

⚡ Performance

• Prevent sidebar re-renders during streaming (reduces UI churn / improves responsiveness).

🐛 Fixes

• Bug fixes around PTC, UI, etc.

This release includes a wide range of features and bug fixes spanning the entire product.

✨ Highlights

We now have fledgling support for sub-agents. When you enter Plan Mode, the user-facing agent may spin up any number of sub-agents for exploration and research tasks.

Workspaces are now Archived instead of deleted by default. Users can easily revive archived workspaces with all of their state intact:

Archived workspaces continue to consume the same storage as live workspaces, but no longer clutter the UI or run background processes. This also makes it easier to track longer-term costs.

We shipped several improvements to the Code Review experience:

• The review panel now refreshes automatically — edits stream in real time
  • Edits are sorted by first-seen timestamp, so the most relevant hunks appear at the top
• You can load more of a file to see surrounding context
• Review controls are significantly more compact

You can now more easily see context usage in the chat input area:

This replaces the infamous vertical usage bar that resembled a scrollbar.

🫡 Honorable Mentions

• Many improvements to compaction, including better preservation of plan context, recent edits, and TODO lists
• Support for agent skills (docs)

🛠️ Fixes

• Significant performance improvements across the app
• Reduced layout flashing and smoother transitions
• Improved compaction robustness, with better behavior around interruptions and edits

This release primarily contains polish and performance improvements.

Screenshots

Revised tabs and diffs:

Features

• Added branch selector to Workspace title bar
• Major performance improvements for long chat histories
• Revised thinking level to persist by model
• Revised Model Switcher to support use case where you have a small number of "go-to" models that you frequently switch between

Features

• Post-compaction context preservation for better continuity.
• Cumulative cost tracking for the entire chat
• Shows line additions/deletions in the git status indicator, with a toggle to enable/disable.
• OpenAI service tier improvements
  • Defaults the OpenAI service_tier to Auto
  • Adds a service tier dropdown in the UI

Fixes

• Model display with mux-gateway: Keeps model display formatting clean and consistent when using mux-gateway.
• New chat focus shortcut: Adds Ctrl+I to focus the input on the new chat page.
• Gateway toggles + model caching defaults: Fixes gateway toggle behavior and adjusts model LRU defaults.
• Editor deep link fallback: Falls back to editor deep links when the CLI isn’t available.

Hot-release for GPT 5.2 models.