Pattern: Cross-Model Mutual Code Review Emerges as Workflow — Editors Now Pit LLM Families Against Each Other

GitHub Blog·high signal

GitHub Copilot's new Rubber Duck cross-family review — where Claude critiques GPT-authored code and GPT-5.5 reviews Claude-authored code — formalizes a pattern practitioners have been doing manually. This is significant because it treats model diversity as a reliability mechanism, not just a capability comparison. When two model families independently flag the same issue, confidence is high; when they disagree, the human gets meaningful signal about where to focus review. Expect more tools to build multi-model review into their default workflows.