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GitHub Copilot CLI

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  1. AI toolsReach 42

    GitHub Copilot pairs Claude with GPT-5.4 for a second opinion

    GitHub just launched Rubber Duck in experimental mode for Copilot CLI, a cross-model review agent that taps another model family to critique coding plans and implementations. When Claude orchestrates, GPT-5.4 steps in at key checkpoints to spot blind spots. On SWE-Bench Pro, pairing Sonnet 4.6 with Rubber Duck closed 74.7% of the gap to Opus alone.