Visual Studio Code 1.139 (Insiders)

Last updated: September 21, 2026

Welcome to the 1.139 Insiders release of Visual Studio Code.

These release notes cover the Insiders build of VS Code and continue to evolve as new features are added.

You can still track our progress in the Commit log and our list of Closed issues.

These release notes were generated using GitHub Copilot and might contain inaccuracies.

Happy Coding!

September 20, 2026

Open Keyboard Shortcuts and Running Extensions as modal editors in the Agents window, so these utility editors no longer replace the active session. #336936: Open utility editors modally in Agents Window

Rename Preview settings for completed agent sessions from Archive to Mark as Done, and migrate existing automatic-cleanup values to the renamed settings. #335801: Rename Archive settings to Mark as Done
Add **/.jj to the default files.exclude Open in VS Code Open in VS Code Insiders patterns so Jujutsu repository metadata stays hidden in the Explorer. #308943: Exclude .jj (Jujutsu VCS) directory by default
Add model picker controls for choosing a model's Thinking Effort and, when offered by the model, a longer Context Size. #280436: Feature request: Configurable reasoning level and "max context" mode in VS Code Copilot Chat
Preserve an explicit Mark as Unread state for the focused agent session until you leave and return to the session or mark it as read. #336721: Mark as Unread does not mark the currently focused session as unread
Remove stale persisted references and artifacts from agent sessions without deleting the underlying file, issue, or pull request. #336500: Remove stale Agent Host session references

Add an Optimize for control to the Auto model, with Efficiency, Balance, and Intelligence options for balancing model capability, speed, and cost in Copilot Chat and Copilot SDK agent sessions. #333266: Support for Auto Tiers

Update the desktop runtime to Electron 43.6.0, improving VoiceOver Braille line tracking on macOS and native window controls on Linux. #331466: Electron 43 update
Add keyboard shortcut to mute or unmute the microphone while experimental Voice Mode is connected and the chat input is focused. #336280: Easier mute/unmute for GitHub Copilot Voice Mode

Add Cargo completions to terminal suggestions, including subcommands, options, packages, targets, features, crates, toolchains, and plugins. #336216: Terminal suggest: Add Cargo completions
With experimental Agent Merge enabled, agents can turn it on for the current session, so you can ask an agent to create a pull request and take it through review and CI. #334033: Agent should be able to enable agent merge on a PR

Add inline color previews for lab() and lch() color values in CSS. #165207: [css] Add new CSS color functions
Extension authors can use display:inline-block in sanitized Markdown span styles to size background highlighting without relying on Codicon classes. #180496: Allow display prop on markdown span style

Make long Remote workspace menus in the Agents window easier to navigate with the mouse by making them searchable and scrollable. #335876: Make the chat input workspace folder Remote picker easier to navigate with the mouse
Add the editor.wordWrapIndicator Open in VS Code Open in VS Code Insiders setting to show a marker at the wrap column for soft-wrapped lines. #47855: Add wordwrap indicator
Improve Auto model selection in multi-turn Copilot harness conversations with updated context routing. #333261: Support Multi-turn context routing v2 in Auto via Copilot Harness
Restore the Markdown editor option in the editor overflow menu for Markdown files. #334429: Markdown Editor is entirely unavailable
The proposed AuthenticationSession.expiresAfter API exposes an access token's lifetime in milliseconds, or undefined when the expiry is unknown. #335184: API proposal: Expose AuthenticationSession access token lifetime

We really appreciate people trying our new features as soon as they are ready, so check back here often and learn what's new.