SourcesArcee Trinity Large — Open 400B Sparse MoE 13B ActiveArcee AI·high signalXBlueskyLinkedInCopy linkLargest open-weight US model. 400B total, 13B active. 87.2 MMLU. Apache 2.0. Trained in 33 days on 2048 B300s for ~20M.SourceSource pageArcee AI↳ Follow the threadPolicy dependency / Stack layerAppending a Security-Requirements Section to a Vibe-Coding Prompt Cut Confirmed Findings From 51 to 24 Across Six Web AppsarXiv 2608.20963Policy dependency / Stack layerAgents leak protected context through tool-call arguments at rates up to 75%, and privacy instructions do not stop itarXiv 2608.20658Stack layer / Threat patternA 17-Model, 28-Task Single-Harness Leaderboard Puts GLM-5.3 at 100% Pass for $0.28 a Lap, About a Fifth of GPT-5.5Reinvently (Ed Yau), 239 points on Hacker NewsStack layer / Threat patternCROSS-CATEGORY: The Guardrail Layer Around Coding Agents Shipped at Four Different Points in the Lifecycle in 48 HoursHacker News Show HN and Product Hunt (2026-08-24 and 2026-08-25)Policy dependency / Stack layerMCP-Universe RL trains tool-use agents by using MCP servers as the RL environment interfacearXivStack layer / ContrastOmniAssistBench Scores Gemini-3-Pro at 66.4 out of 100 on Real-Time Video Assistance, Qwen3-Omni-Instruct at 51.2arXiv 2608.21360Stack layer / Contrastd-Matrix Raptor Claims 100 TB/s From 3D-DRAM and 20x the Bandwidth Density of HBMServeTheHomePolicy dependency / Stack layerAn evaluator scoring 98.41% recovered only 54.8% of valid judgment receipts when its evidence was permutedarXiv 2608.20938