Plandex – an AI coding engine for complex tasks
Hey HN, I'm building Plandex (https://plandex.ai), an open source, terminal-based AI coding engine for complex tasks. I built Plandex because I was tired of copying and pasting code back and forth between ChatGPT and my projects. It can complete tasks that span multiple files and require many steps. It uses the OpenAI API with your API key (support for other models, including Claude, Gemini, and open source models is on the roadmap). You can watch a 2 minute demo here: https://player.vimeo.com/video/926634577 Here's a prompt I used to build the AWS…
Plandex – an AI coding engine for complex tasks launched on April 3, 2024 with 304 votes, #142 of 4,347 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 2 years on.
In plain words
Plandex is an open-source, terminal-based AI coding engine that helps developers complete complex programming tasks spanning multiple files and steps. It eliminates manual copying and pasting between ChatGPT and project files by integrating AI directly into the workflow. The tool uses the OpenAI API with user-provided keys, with support for additional models planned. It focuses on systematic iteration and handling problematic outputs to work through complicated coding challenges efficiently.
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
In the maker’s words, at launch
Hey HN, I'm building Plandex (https://plandex.ai), an open source, terminal-based AI coding engine for complex tasks. I built Plandex because I was tired of copying and pasting code back and forth between ChatGPT and my projects. It can complete tasks that span multiple files and require many steps. It uses…
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Plandex v2 – open source AI coding agent for large projects and tasks2025 · github.com · ▲257Hey 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…
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