GitHub Copilot CLI Adds Multi-Model Cross-Review, Closing 74.7% Performance Gap
0xkarasy · x · 2026-07-30
GitHub Copilot CLI experimentally introduced Rubber Duck, a feature that uses a second model from a different AI family as an independent reviewer to cross-check the coding agent's plans and code.
- Core Mechanism: It addresses the training biases and blind spots inherent in single-model self-reflection, providing a "second opinion" from a different perspective before plan execution.
- Eval Results: Assessments show that Claude Sonnet paired with Rubber Duck closes 74.7% of the performance gap between Sonnet and Opus alone.
- Use Cases: This mechanism is particularly effective for complex multi-file operations and long-running tasks, preventing early erroneous decisions from compounding.
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