GitHub Copilot CLI gets a second-opinion feature built on cross-model review
ID: 4a1c0d08-9518-5a27-a6fb-19a89edaf8b9
STIX ID: report--4a1c0d08-9518-5a27-a6fb-19a89edaf8b9
Feed Name: Help Net Security
GitHub announced Rubber Duck, an experimental cross-model review agent in Copilot CLI that runs a GPT-5.4 reviewer alongside Claude-family orchestrators to surface assumptions, edge cases, and implementation issues; the article covers how Rubber Duck triggers, benchmark improvements on multi-file/long tasks, example bugs it caught, and availability details.
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