Pair Programming for Claude and Codex, Without the Copy-Paste

Title: Pair Programming for Claude and Codex, Without the Copy-Paste

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Published Time: 2026-04-21T12:00:30Z

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# Pair Programming for Claude and Codex, Without the Copy-Paste | by Cihat Gündüz | Apr, 2026 | Medium

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# Pair Programming for Claude and Codex, Without the Copy-Paste

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[Cihat Gündüz](https://jeehut.medium.com/?source=post_page---byline--986abe20e8bd---------------------------------------)

8 min read

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I’d been running Claude and Codex in parallel manually for months — copy-pasting between sessions, passing findings back and forth. TandemKit automates that workflow.

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For the past several months, my development workflow looked like this: I’d run Claude Code and Codex side by side. Same prompt, same goal, both investigating the codebase independently. When it was time to plan, Claude would draft the plan and I’d copy it over to Codex for review. Codex would spot things Claude had missed — edge cases, wrong assumptions, overlooked files. I’d relay the findings back, let Claude revise, copy the revision bac