AI BRIEFING / WeeklyMon, Sep 28, 2026 — Tue, Sep 29, 2026

Weekly AI briefing

Editor's picks come first, followed by stories repeatedly covered across days and sources.

Top stories

01
Editor's pick
Anthropic Releases Prompting Guide for Claude Opus 5.5 with Effort Calibration and Agentic Updates
Claude Opus 5.5 defaults to 'medium' effort and requires new handling for thinking blocks and safety refusals compared to Opus 5.
Hacker News
02
Editor's pick
Anthropic's Claude Solves 9-Loop Scattering Amplitude in N=4 Super Yang-Mills
Anthropic's Claude Science platform used the Fable 5.1 model to independently calculate the 9-loop scattering amplitude for N=4 super Yang-Mills, a task previously considered impossible by direct computation.
Anthropic News
03
Editor's pick
NHN Cloud Developer's Experience Building an AI Harness: There Is No Silver Bullet
A firsthand account of spending a month refining an AI harness to solve the problem of repetitive initialization in every AI session.
NHN Cloud
04
Editor's pick
GLM-5.3-Flash Matches Specialized Decision Models in Zero-Shot Classification via Logit Extraction
Benchmarking across 29 datasets shows GLM-5.3-Flash achieves statistical parity with the specialized Jev model for intent classification without fine-tuning, though at higher latency and cost.
GeekNews
05
Editor's pick
Supersonic Labs Releases Julia-1, a 144M Parameter Open-Source Local Classifier
Julia-1 is a 144.3 million parameter multilingual encoder designed for CPU-only execution, capable of classification, ranking, and binary question answering.
Reddit

NawfalMotii79/PLFM_RADAR
Assembling a 10.5 GHz Phased Array Radar as Open Source
KKKKhazix/AIHOT
Take Control of AI News Curation Logic
InfinityLoop1308/PipePipe
An Android Media Client That Goes Beyond NewPipe's Limitations