How big is this codebase? gpto-preview and claude sonnet are both fairly capable. Claude has longer context windows and is a little less lazy. aider.chat is working on an architect / coder model right now that's verrrry effective. Essentially - paste your whole codebase into 4o-preview, ask it to rearchitect to spec, and output a design document and list of tasks suitable for a senior dev. Dump that plus your tarball into claude as two separate pastes, and be like "Do task 1".
ya for extra clarification - a tarball or .tar file is an uncompressed container for files. It can also be compressed (.tar.gz, .tar.bz2, etc)
ultimately though the end user is not really concerned with this. the tarball needs to be un-tar'd regardless of whether it is compressed. (some nuance here as certain compression formats might not be supported by the host... but gzip and bzip2 are common)
I haven't tested a compressed tarball yet but I would imagine chatgpt won't have issues with that.
