Use Two AI CLI Sessions in Parallel to Cross-Check Debugging Answers

A technique gaining attention among developers involves running two separate AI command-line tools simultaneously to critically evaluate each other's responses during debugging or incident response. The approach requires opening two independent terminal sessions — using tools like Claude Code, Codex CLI, or Gemini CLI — ensuring neither session shares context with the other. Rather than posing the same question to both, the user asks the first model for a concrete diagnosis, then pastes that answer into the second session and asks it to identify gaps or weaknesses in the reasoning. The method is most valuable in high-stakes situations, such as before pushing a fix to production, rather than for routine queries. When both models agree it offers mild corroboration, but disagreement is considered especially useful as it highlights genuine ambiguity in the problem at hand.