GitHub Copilot

GitHub has launched ReviewBench, an open benchmark for evaluating AI code review agents. According to GitHub, it uses representative pull requests, multi-source ground truth, calibrated evaluation, and production-aligned metrics. Dataset size, model scores, and licensing details were not included in the announcement summary.

GitHub has published a beginner's guide to canvases in the Copilot app, a feature that lets users describe an interface in natural language and have the agent build a live, interactive surface. The feature targets users who want custom workflow tools without writing code.

GitHub's engineering blog makes the case that chat boxes aren't the right interface for every developer task, pointing to canvas-style UIs as a more tangible alternative within Copilot. The post is a design philosophy piece rather than a new model or feature launch.

GitHub has re-engineered the diff-viewing surface inside the GitHub Copilot app to support pull requests spanning up to a million lines of code with hundreds of inline comments. The change addresses performance bottlenecks that previously made large-scale code review sluggish or unusable.

GitHub has introduced local sandboxing in the GitHub Copilot app, a configurable feature that limits access to files, network resources, and credentials on a user's machine. The change targets risk reduction from unintended or unexpected command execution during agentic coding sessions.

GitHub has updated Copilot CLI's C++ code intelligence with whole codebase indexing, targeting performance in large repositories with millions of lines of code. The change addresses navigation and context challenges specific to deeply interconnected C++ source trees.

GitHub used its own Copilot agent to help migrate the Copilot runtime to Rust, producing roughly 800,000 lines of production code. The company says the scale of the rewrite would not have been feasible without agentic coding assistance.

GitHub has released Project HydraFusion as a research preview in GitHub Copilot, an orchestration system that routes coding tasks across multiple models. GitHub claims its selective workflows matched or exceeded an Opus 5 baseline in offline evaluations while cutting estimated workflow cost.