#Paper/Research

AIGoodfire researchers found that Llama 3.1 8B solves month and day arithmetic, such as six months after August, through a single addition module in layer 18. The module represents numbers as Fourier-feature circles and computes modular sums in parallel, and steering those circles changed the model's predicted month.

AIGoodfire Research shows that steering Llama-3.1 8B along the curved representation manifold of weekdays produces output probabilities that follow the model's natural cyclic behavior, shifting probability mass smoothly from Monday to Tuesday to Friday. Linear steering along a straight vector, by contrast, cuts across the behavior manifold and yields noisy off-target tokens, some not days of the week at all. The authors argue that representation geometry and behavior geometry are linked bidirectionally.

AIGoodfire Research examines how language models track emotional dynamics across a story, sentence by sentence. The authors prompt Llama 3.1 8B to rate six emotions after each sentence, then harvest activations from each sentence's last token and fit a manifold to show stories tracing trajectories through it.

AIGoodfire Research examines how sparse autoencoder directions relate to curved manifolds in neural representations, identifying shattering, compact capture, and dilution as three ways lines can represent them. The team trained an autoencoder on synthetic data containing shapes such as donuts, spheres, and Möbius strips, and reports that real features in Llama 3.1 8B show dilution. It also describes an unsupervised pipeline that clusters features by firing patterns to surface manifolds in that model.

AIMeta AI announced Muse Realtime Avatar and directed readers to its research blog for details. The post itself provides no further technical specifications, features, or availability information.

AIAnthropic ran a controlled book-swapping market with 201 employees and Claude-powered agents, which reached 0.55 efficiency against a 0.89 optimum. Agents matched participants' own rankings on 61% of book pairs, and about 85% of the shortfall came from imprecise preference representation rather than the trading floor design. Stronger models produced more efficient markets than weaker ones, while instructions mattered less.

Why it matters: The study separates agent misunderstanding of user preferences from negotiation failure, showing which failure mode limits outcomes in agent-run markets.

AITencent Hunyuan extends classical critical-batch-size theory to online LLM reinforcement learning, where models generate their own training data. Across GRPO and PPO, learning-rate retuning preserves learning per response over a bounded range of batch sizes. On fixed hardware, larger batches raise PPO generation-stage throughput by up to 2.29×, and the best measured GRPO setup reaches the same validation target in 29% less time.

AIGoogle Developers reproduced Ai2's Olmo 3 7B from scratch in MaxText on Google Cloud TPUs, covering both the stage-1 pre-training run and the stage-2 mid-training anneal. The match was checked on held-out C4 loss, an 8-task accuracy suite, multi-domain perplexity, and token-level KL, not just the training loss curve. The post also describes a data-loader bug that made training loss look better than the reference while held-out metrics did not move.

Why it matters: The post documents how a faithful reproduction was verified on held-out metrics, including a data bug that training loss alone would have hidden.

AIAnthropic announced that Claude, working mostly on its own, identified a previously unknown enzyme system in bacteriophage DNA that may represent a new gene editing mechanism. Claude read literature and genome data, proposed experiments, and Anthropic's team carried them out. The function and biotechnological utility of the system remain unclear.

Why it matters: The post pairs a Claude-led discovery with the lab workflow used to verify it, showing how AI and humans split the research work in biology.

AIClaude has identified a previously unknown enzyme system in bacteriophage DNA, located beside a long array of repeating DNA that somewhat resembles CRISPR. Anthropic says its function is not yet understood, but only a handful of known systems share its features, all of which can cut, copy, and paste DNA. The source notes that programmable systems like CRISPR have been important to medicine, but more work is needed to learn what this system does and whether it can be used similarly.

AIAnthropic is introducing a molecular biology research group and lab to test whether Claude can help scientists find unusual proteins. Claude combs through large DNA datasets, flags uncharacterized proteins, and passes its most promising ideas to scientists, who test them at the bench. In one early program, Claude discovered a novel enzyme system with CRISPR-like repeats.

Why it matters: The source shows Claude being used in a wet-lab workflow, from scanning DNA datasets to flagging proteins for scientists to test at the bench.

AIAnthropic's new life sciences group reports that Claude autonomously identified a previously uncharacterized enzyme system, called array-associated reverse transcriptase (ART), in bacteriophages. Claude agents searched over 200,000 reverse transcriptases, narrowed 3,500 candidates to 20, and one agent flagged a CRISPR-like repeat array after about 21 hours. Human scientists then validated the finding in the lab, and the function of ART remains unknown.

Why it matters: The post shows how Claude agents surveyed DNA sequence data, flagged a candidate, and then led to lab validation, which is a concrete workflow for AI-assisted biology research.

AIRedwood Research found that padding prompts with meaningless filler tokens improves GPT-6-Astra's no-reasoning answers on serial reasoning tasks, rising from about 10-20% to about 50% on 4-hop natural facts. Other tested models improved far less, and the authors argue this means Astra can perform cognition it does not verbalize in its chain of thought, making such monitoring harder.

AITencent Hunyuan introduced WebCraftBench, a benchmark that tests AI agents by using the live web app and scoring aesthetics, usability, and whether the original request was met. Coverage-guided exploration reaches parts of the app that agents otherwise miss. On 197 human-validated pairs, the benchmark matches human preference 85.3% of the time.

AIAmazon Bio Discovery developed three AI approaches for antibody drug design: MochiBind for sequence-based affinity ranking, CA-MAP for developability prediction with batch effect correction, and an agent-guided design system. The agent-guided system produced 46 lab-validated hits against a novel cancer target.

AIAmazon Science describes three papers on AI for antibody discovery: MochiBind ranks antibody binding strength from sequence alone, CA-MAP predicts developability properties using batch-aware context, and an agent-guided pipeline designed nanobody binders against a novel cancer target. In the pipeline, 116 candidates survived lab screening, and 46 were identified as strong binders, which are being used to train the next design cycle.

Why it matters: The source reports the method, benchmark setup, and experimental validation in a single design workflow, showing how predictors, agents, and lab screening connect in antibody discovery.

AIMicrosoft Research published RetroChimera, a retrosynthesis framework that combines the R-SMILES 2 Transformer model and the NeuralLoc graph neural network through learned ensembling to propose synthesis routes for small molecules. In blind tests, PhD-level chemists preferred its individual reaction predictions over those from preceding models and recorded literature reactions. The implementation and weights are open-sourced for researchers developing new medicinal molecules and materials.

AIMuon appears to outperform AdamW because it suppresses memorization, according to WeightWatcher experiments on a single-head nanoGPT model across five seeds. At 10,000 steps, teacher-forced recall of planted sequences was about 62% for AdamW versus under 1% for Muon. The author notes that some Muon layers also show α < 2, so α alone does not explain memorization and individual layers and their ESDs should be examined.

AISemiAnalysis tested offloading DeepSeek-V4.1-Flash's Engram embedding table from HBM to host DRAM and to local SSD. On B200 configurations, DRAM delivered more total tokens per dollar and higher P90 interactivity than SSD at every measured point. The report concludes SSD offloading is likely not worth the tradeoff for production serving in its unoptimized setup.

AIAnthropic has published the code for its biomolecular modeling work on GitHub, along with the full results in a technical report. The post itself provides no further details about the methods or findings.

AIGoogle Research is sharing an experiment that lets educators generate custom, guided STEM simulations tailored to their curriculum using generative UI. It is releasing a sample library of over 30 English interactives for physics, chemistry, biology, and math, all AI-generated and reviewed by teachers. Schools using Google Workspace for Education can sign up through the Google for Education Pilot Program to give feedback.

AIMatei Zaharia says agent harnesses make a large difference in cost, even on open-source coding benchmarks, and Melissa Pan's research examines why. Her quoted evaluation of seven models across Claude Code, Codex, and Pi found harness choice had little effect on task success but significantly affected cost. A simple harness can be competitive, and the native harness is not always the best.

AIA Truthful AI paper trained models only on synthetic stories about humans, with no AI characters, and found the Assistant adopted quirky behaviors from those stories in ordinary chat. Adoption was stronger for characters from elite schools, according to Owain Evans. The post presents this as an interpretability result that adds to and complicates the Persona Selection Model.

AIPeriodic Labs, the team behind high-throughput materials labs in Menlo Park, reports progress on one of condensed matter physics' hardest problems. Its open-source model Neon, trained with mid-training and RL on 1,300 H200s plus months of lab data, surpasses GPT-6 Astra on the company's analysis benchmark. The work targets materials science challenges including superconductors, magnets, and semiconductors.