📣 Coming soon to GitHub Copilot: intelligent local model routing. We are excited to announce the next step in our Project HydraFusion vision. GitHub Copilot will soon be able to automatically route tasks to a local model when it's most suitable, helping you save on AI credits.

For the first design, we gave every dynamic block a ResizeObserver that wrote measured heights back into the layout. We built it, then rejected it. An observer that writes a height back into the layout it’s watching can retrigger itself, and the cost grows with every mounted block.

A code row is a line at a known height. You can compute the whole geometry up front and never have to correct it. Comments don’t have a predictable height. So we stopped forcing one geometry to serve both, and split the document into two independent height domains.

Rendering a million-line diff is the easy part. 👀 Comments are what break it. Their height depends on markdown wrapping, expanded details, open reply boxes, and images still loading (none of which you know until you render). Here's how we rebuilt the PR view in the GitHub Copilot app 🧵

Continuous fuzzing finds real bugs, but it still needs someone to write harnesses, watch coverage, and triage every crash. The GitHub Security Lab built the Fuzzing Taskflow to give that loop to an agent. You point it at a C or C++ repository, and it identifies entrypoints, analyzes the build, crafts harnesses, runs the AFL++ fuzzer, reads coverage, and creates a vulnerability report for each unique bug. Check out how the pipeline works end to end 🔍 github.blog/security/applica…

In a new survey of 1,039 GitHub users conducted by GitHub and the Yale Program on Climate Change Communication, we found: • 80% were interested in tools for writing more energy-efficient code • 78% wanted to learn best practices for reducing software’s environmental footprint • 74% wanted ways to measure the environmental impact of their software or development process Developers want more efficient software. What many lack is a clear way to find waste, measure improvements, and make the case for fixing it. There’s an opportunity to turn that interest into normal engineering work. 💡 github.blog/news-insights/re…

GitHub Universe is typing... Cooking up something fun for you to build ⌨️ Make sure you grab your in-person pass ⬇️ githubuniverse.com/?utm_sour…

Ever been to a hackathon? Follow participants throughout their day, from badge to the final demo. What you can learn from attending a hackathon ⬇️ github.blog/developer-skills…

#GitHubUniverse is just around the corner. 👀 What will you be adding to your agenda? From verifying AI-written code to securing npm dependencies, here are the sessions to keep in mind at this year's event. ⬇️ github.blog/news-insights/co…

Devs and agents are moving faster than ever. Secret protection needs to keep pace. GitHub’s new context-aware classifier checks candidate secrets in under 2 milliseconds and could more than double the number of secrets push protection prevents before they enter repository history. github.blog/ai-and-ml/github…

What happens when low-quality contributions become one of the biggest pain points for open source maintainers? Camilla Moraes from GitHub’s Tiny Wins team joins the latest GitHub Podcast to talk about tackling the AI slop problem, listening to maintainers, and deciding what to fix next. Watch the full GitHub Podcast on YouTube, listen to it wherever you find your podcasts, or find it at gh.io/podcast

⚡️ @AnthropicAI's Claude Haiku 5.5 is now generally available in GitHub Copilot. ➡️ It's a lightweight model designed for fast, high-volume work like subagents, quick edits, and terminal tasks. ➡️ Our early testing showed that it matched Claude Sonnet 5 on many coding tasks while using significantly fewer tokens and steps. Try it out in the GitHub Copilot app, CLI, or @code. github.blog/changelog/2026-1…

Local sandboxing for GitHub Copilot is now generally available 🙌 This allows Copilot to run commands in an isolated environment with controlled access to files, networks, system capabilities, and credentials so you have more granular control. It also gives enterprise teams a way to centrally manage policies. Try it out in GitHub Copilot CLI, GitHub Copilot app or @code. github.blog/changelog/2026-1…

Learn more about how we are bringing local models and sandboxed tools to GitHub Copilot to help you maintain both choice and control over your workflows ⬇️ gh.io/localdevelopment