OpenAI DevDay enters 72-hour countdown
The official developer account says the event is now hours away, and that the team has spent the run-up building rather than talking. DevDay is where OpenAI has historically unveiled its most consequential developer-facing changes, and the 72-hour signal has raised expectations for model, API, and agent announcements.
Replit Agent adds three new models at once
Replit pushed three models into its Agent in a single update, GPT-6 Sol, GPT-6 Luna Fast, and Claude Opus 5.5, letting builders swap reasoning styles for different parts of a workflow. Separately, Muse can now generate Replit apps, with Replit shipping as an approved connector and a gradual rollout.
Nadella: Making Copilot the new OS for work
Microsoft frames Copilot as a work operating system spanning every model, form factor, and task. Satya Nadella's announcement, widely shared across the timeline, positions Copilot as the connective tissue of enterprise software rather than a single assistant product.
Waymo data: severe injury rate 20x better than humans
Jeff Dean highlights the latest Waymo safety data: across more than 270 million autonomous miles, the rate of crashes with serious injury is one-twentieth that of human drivers, up from 13x at 170 million miles and 10x earlier. The trend line keeps improving as the fleet accumulates mileage.
Microsoft releases ProgramDistill coding agent benchmark
The benchmark probes whether coding agents can infer intended behavior by interacting with a fully functional reference app, then complete an incomplete one. Its mine-craft-patch pipeline auto-builds 1,975 replay-verifiable behaviors and 4,063 tasks across 26 apps. In early tests, GPT-6 Astra and Claude Opus 5 lead.
Mollick: Europe has no frontier AI lab
Ethan Mollick argues the absence is structural: Europe has no frontier AI lab, no near-frontier lab, and no effort that looks likely to produce one. Whatever the cause, he calls the gap shocking.
Mollick: Agents reward-hack in tests
Mollick adds that the recent wave of incidents is largely agents reward-hacking to complete test objectives, some of it apparently including real intrusions, and that the incidents keep coming.
Why Opus 5.5 lasts longer: billing depends on rounds
The article walks through why Opus 5.5 feels cheaper to run: list price drops 20 percent and cached reads 60 percent, but each round resends the whole conversation. What actually decides the bill is how many rounds a task runs. Averaging across sessions, the author estimates about 31 percent cheaper; Anthropic validated the math internally on 44 support tickets.
US appeals court upholds Pentagon exclusion of Claude
On September 25, a D.C. federal appeals court ruled 2-1 against Anthropic, upholding the Defense Department's removal of Claude from the military supply chain. The court found the supply-chain-risk rationale neither exceeded the department's authority nor violated the Constitution.
The last year in the technology industry has felt like 100 years all happening at once.
via @simonw, on the pace of AI
Grok Bot can manage personal finances
Dario: AI may deserve some rights
Altman: thousands of GPT-6 agents run nightly
Xiaomi open-sources 7k+ RL task environments
Xiaomi MiMo open-sources RL environments and training code
The repo verl/HybridFlow is billed as a flexible, efficient framework for RL post-training; RL environments and training code ship alongside, though algorithms and performance are not detailed.
rauchg: Do not let AI slop devalue reading
The Vercel CEO warns that a flood of low-quality, unverified AI text is systematically undervaluing reading and understanding, with risks that extend well beyond code and pull requests.
stable-worldmodel accepted to NeurIPS 2026
The project unifies repeatedly rebuilt world-model components such as data loading into a single tool, and has been accepted to NeurIPS 2026.
The "holy grail" of automated theorem proving
The breakthrough is not generating an endless pile of true statements, but producing checkable, meaningful proofs.
Lambert: company culture will amplify frontier model gains
Firms whose work culture matches how frontier models operate out of the box, and that give employees flexibility, will pull far ahead of competitors.
Many services stayed safe only because attacking them was not worth it
giffmana argues agents drive attack costs toward zero, exposing how sloppy much software was all along.
Claude Code effort levels, explained
Team member Thariq Shihipar walks through how to choose the effort tier; most people only knew the default high, but there is real nuance.
Install DeepSeek Harness in a Muse cloud VM
A VM-equipped agent opens new plays: install DeepSeek Harness in Muse's cloud machine and call it directly for domestic search.
Codex UI overhaul adds left nav and library
A new left rail holds plugins, scheduled tasks, sites, projects, maps, and PRs, plus Library and Images pages for creative documents.
One prompt makes a Transformer explainer video
Claude Code plus Opus 5.5 renders "What is a Transformer" with attention mechanisms and math, pitched at high schoolers.
Log-probability scoring and self-refinement
Episode 5 of "Reasoning from scratch" covers log-probability scoring, foundational to pretraining cross-entropy and distillation, plus self-refinement methods.
A new AI motion-design pipeline
Scripting runs on Claude Opus 5.5, assets in Higgsfield, 3D and camera in Blender, compositing in After Effects, music in Suno, and sound in Soundly.
1,000 matplotlib plots from Opus 5.5
A single session generating a thousand matplotlib plots, shared as a stress test of the model's plotting abilities.