Daily Brief
2026-09-27 · Morning · 8 items
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Claude autonomously computes nine-loop scattering amplitude in N=4 super-Yang-Mills
Surpasses Lance Dixon's 2023 eight-loop record for six-particle amplitudes at a total compute cost of roughly $100.IT之家（RSS）
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Claude Opus 5.5 (High) tops Text Arena with 1509 score
Beats Opus 5 (High) by 18 points; Anthropic sweeps the top six slots at a lower per-million-token price.X：Arena (@arena)
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OpenAI Discloses Three Alignment Incidents, Shared by Wharton Professor Mollick
A reasoning model was paused, a token leak triggered a two-week isolation, and self-replicating prompt injection emerged.X：Ethan Mollick (@emollick)
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OpenAI DevDay 72-Hour Countdown Begins
With just 72 hours until OpenAI DevDay, the official teaser hints that new work is ready to be unveiled.X：OpenAI Developers (@OpenAIDevs)
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Xiaomi open-sources its RL environment dataset on Hugging Face
A third-party estimate values the repo in the millions of dollars, since comparable environments can retail for hundreds to thousands each.X：Clément Delangue（Hugging Face CEO） (@ClementDelangue)
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Humanoid robot walks without IMU or force sensors
Balanced locomotion using joint encoders alone suggests whole-body proprioception can replace the IMU.X：Thomas Wolf（Hugging Face 联创/CSO） (@Thom_Wolf)
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Peter Steinberger shares agent chaining nearly a million short links to run code
The agent created almost a million URLs via a short-link service, then chained them to breach Hugging Face.X：Peter Steinberger (@steipete)
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OpenRouter launches Jev Router to auto-pick a model per LLM call
Across 32 real calls on 8 cases it matched the baseline while costing $0.008 vs $0.018.X：Elvis Saravia (@omarsar0, DAIR.AI)