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Open Responses Server: Wraps any OpenAI API interface as Responses with MCPs support so it supports Codex. It is listed under Development & Code on AI Registry as a free tool.
The tools below are approved listings in the same category, ordered by how closely their tags match Open Responses Server. This is an automatic list. We have not written a researched verdict for Open Responses Server yet, so treat it as a shortlist and check each vendor's pricing page before switching.
Built from each tool's listing. Vendors can update their own listing after claiming it.