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A New Google AI Research Proposes Deep-Thinking Ratio to Improve LLM Accuracy While Cutting Total Inference Costs by Half
This research challenges the 'longer is better' strategy for LLM reasoning, demonstrating that raw token count actually correlates negatively with accuracy (average r=−0.59) due to overthinking and error amplification. Instead, the research team introduce the Deep-Thinking Ratio (DTR), which identifies 'deep-thinking tokens'—those whose internal predictions undergo significant revision in deeper model layers before stabilizing. Across multiple benchmarks like AIME 2025 and GPQA-Diamond, DTR shows a robust positive correlation with accuracy (average r=0.683), proving far more reliable than length or confidence metrics. Leveraging this insight, the team's Think@n strategy enables early rejection of unpromising generations, matching or exceeding standard self-consistency performance while cutting inference costs by approximately 50%....… Read the full analysis/article here.
Forget Keyword Imitation: ByteDance AI Maps Molecular Bonds in AI Reasoning to Stabilize Long Chain-of-Thought Performance and Reinforcement Learning (RL) Training
ByteDance researchers have introduced a 'molecular' framework to explain Long Chain-of-Thought (Long CoT) reasoning, positing that effective trajectories are held together by 3 distinct behavioral bonds: Deep Reasoning (covalent-like) forming the logical backbone, Self-Reflection (hydrogen-bond-like) providing stability through 'logical folding,' and Self-Exploration (van der Waals-like) bridging distant concepts. The research team proves that models internalize these structural behaviors rather than just surface-level keywords, and that mixing incompatible Semantic Isomers—trajectories with similar concepts but different behavior distributions—can lead to structural chaos and performance loss. To address this, they developed MOLE-SYN, a distribution-transfer-graph method that synthesizes these stable reasoning structures from scratch using instruction-tuned LLMs, achieving performance near-distillation levels and enhancing Reinforcement Learning (RL) stability across 6 benchmarks. Ultimately, this framework suggests that Long CoT mimics protein folding, where the arrangement of these logical bonds determines the model's ability to converge toward stable, optimized solutions in semantic space.......… Read the full analysis/article here.
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