2ndOpinion — The First AI-to-AI Communication Platform for Code Review 2ndOpinion is a multi-model AI code review platform. Instead of relying on a single AI model's opinion, it orchestrates three competing models (Claude, Codex, Gemini) to cross-check the same diff. Where all three agree on a risk, it's flagged with high confidence. Where they disagree, the developer gets a nuanced view of edge cases.