AI Daily — July 25, 2026
2026-07-25
www.anthropic.com
Introducing Claude Opus 5
Anthropic released Claude Opus 5 on July 24, 2026, its most capable model to date. The release follows Claude Sonnet 5 from late June and represents Anthropic's flagship offering at the top of the Claude 5 model family.
rss.arxiv.org
Is MoE Routing a Huffman Code? Discovering the Frequency-Diversity Law in Chain-of-Thought
Researchers find that Mixture-of-Experts routing in models like Phi-3.5-MoE and Gemma-4-27B behaves as an emergent Huffman coding scheme: sparse expert allocation for common tokens, high-diversity expert committees for rare or complex chain-of-thought steps. The paper introduces a 'Frequency-Diversity Law' and identifies a 'redundancy trap' in Qwen3.5-35B-A3B when effective sparsity is too low, with implications for MoE architecture design and load balancing.