What changed
On June 4, 2026, GitHub shipped a meaningful Copilot upgrade for developers working across larger codebases and pull requests.
The release adds:
- 1 million-token context windows in VS Code, Copilot CLI, and the GitHub Copilot app.
- Configurable reasoning levels, so you can trade speed for deeper thinking when the task is architectural, cross-file, or debugging-heavy.
- Richer pull request chat on GitHub.com, where Copilot Chat now sits next to the diff and automatically pulls in more relevant PR and repository context.
Why it matters
This is a practical improvement, not just a benchmark story.
For day-to-day coding, larger context windows mean Copilot is less likely to lose the thread when you are working through a refactor, following logic across multiple files, or asking questions about a sprawling side project. The new reasoning controls also make Copilot more tunable: lightweight settings for quick edits, heavier settings for thornier design and debugging work.
The pull request update matters just as much. Reviewing code is where AI tools often break down because they miss the surrounding intent. GitHub's new PR chat flow is designed to reduce that problem by attaching more diff and repository context to the conversation automatically.
For portfolio-site readers building in public, this is the kind of product change that can actually affect workflow: better support for large-repo understanding, clearer review loops, and less manual copy-pasting into chat.
Practical takeaway
Use the default settings for routine edits. GitHub notes that larger context windows and higher reasoning levels consume more AI credits per interaction, so the heavier settings are best saved for:
- multi-file debugging
- architecture or migration work
- reviewing large pull requests
- understanding unfamiliar repositories