not much happened today

**RAEv2** advances representation-first tokenization with **>10x faster convergence** and improved generation, tested on **text-to-image** and **world models**. **NVIDIA's Gated DeltaNet-2** innovates linear attention with channel-wise gates, outperforming **KDA** and **Mamba-3** at **1.3B parameters** on language modeling and reasoning tasks. Studies on **subword tokenization** reveal only some benefits at scale, while data filtering research suggests that with enough compute, **no filtering** may be optimal at around **1e30 FLOPs**. Mechanistic interpretability updates propose clustering features by joint firing patterns for better geometry understanding. OpenAI's AI-assisted breakthrough on an Erdős unit-distance math problem sparks debate on AI's role in mathematical research. Harnesses remain key for capability improvements in agent infrastructure.