Plandex v2 – open source AI coding agent for large projects and tasks
Hey HN! I’m Dane, the creator of Plandex (https://github.com/plandex-ai/plandex), an open source AI coding agent focused especially on tackling large tasks in real world software projects. You can watch a 2 minute demo of Plandex in action here: https://www.youtube.com/watch?v=SFSu2vNmlLk And here’s more of a tutorial style demo showing how Plandex can automatically debug a browser application: https://www.youtube.com/watch?v=g-_76U_nK0Y. I launched Plandex v1 here on HN a little less than a year ago…
Plandex v2 – open source AI coding agent for large projects and tasks launched on April 16, 2025 with 257 votes, #118 of 7,818 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 1 year on.
In plain words
Plandex is an open source AI coding agent designed to handle large, complex tasks in real-world software projects. It works with multiple AI models to autonomously plan and execute coding work, including debugging applications. The tool is built for developers who need to tackle substantial development tasks efficiently, with capabilities that have expanded significantly in version 2 to enable more autonomous operation.
written from the facts on this page · September 2026
From the sources
Open source AI coding agent. Designed for large projects and real world tasks. - plandex-ai/plandex
💻 Plandex is a terminal-based AI development tool that can plan and execute large coding tasks that span many steps and touch dozens of files. It can handle up to 2M tokens of context directly (~100k per file), and can index directories with 20M tokens or more using tree-sitter project maps. 🔬 A cumulative diff review sandbox keeps AI-generated changes separate from your project files until they are ready to go. Command execution is controlled so you can easily roll back and debug. Plandex helps you get the most out of AI without leaving behind a mess in your project. 🧠 Combine the best models from Anthropic, OpenAI, Google, and open source providers to build entire features and apps…from github.com
In the maker’s words, at launch
Hey HN! I’m Dane, the creator of Plandex (https://github.com/plandex-ai/plandex), an open source AI coding agent focused especially on tackling large tasks in real world software projects. You can watch a 2 minute demo of Plandex in action here…
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