I've been working on something related—Plandex[1], an open source AI coding agent that is particularly focused on large projects and complex tasks.
I launched the v2 a few weeks ago and it is now running well. In terms of how to place it in the landscape, it’s more agentic than aider, more configurable and tightly controlled than Devin, and more provider-agnostic/multi-provider/open source than Claude Code or this new competitor from OpenAI.
I’m still working on getting the very latest models integrated. Gemini Pro 2.5 and these new OpenAI models will be integrated into the defaults by the end of the week I hope. Current default model pack is a mix of Sonnet 3.7, o3-mini with various levels of reasoning effort, and Gemini 1.5 Pro for large context planning. Currently by default, it supports 2M tokens of context directly and can index and work with massive projects of 20M tokens and beyond.
Very interested to hear HN’s thoughts and feedback if anyone wants to try it. I'd also welcome honest comparisons to alternatives, including Codex CLI. I’m planning a Show HN within the next few days.