Claude Code just quietly dropped a feature called Ultraplan, and it’s a legit upgrade to how I plan builds. Instead of doing a slow, linear plan inside the terminal, Ultraplan ships that planning session to the cloud where multiple agents running Opus 4.6 work in parallel. The result is a way more structured plan (context, what exists, new files, modifications, verification), sometimes even with diagrams, and a much better review surface because I can comment on specific sections and then “teleport” the approved plan back into my CLI. In the video, I run a side-by-side test building the same dashboard with local plan vs Ultraplan. The Ultraplan version finished planning in about a minute in one test (while local was still running past 4 minutes), and in the bigger dashboard build it went end-to-end in roughly 10–15 minutes, while the local run dragged out massively. I also break down token/usage realities (cloud planning tokens aren’t shown), the hard requirements (it has to be launched from the CLI and your project needs Git sync), and what’s happening under the hood: three parallel exploration agents plus a critique agent in Anthropic’s cloud container runtime, capped at 30 minutes.