Summary
A researcher discovered that duplicating a specific 7-layer block within Qwen2-72B, without modifying weights, significantly improved performance and topped the Open LLM Leaderboard. This technique, which suggests the existence of discrete functional circuits within pre-trained models, led to descendants that still dominate the leaderboard in 2026. The key insight is that only 'circuit-sized' blocks of around 7 layers yield these performance gains.
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