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programming languages Sep 17 Egglog and Equality Saturation in a Production Tensor Compiler Two engineers from Luminal, a compiler startup that recently closed its Series A, presented at an E-Graphs meetup on September 17 about how equality saturation powers their production tensor compiler. The talk by CEO Joe Fioti and... scraping Sep 17 SHOW HN: I built the fastest PHP webserver in the world A decade-old question about PHP's performance ceiling has a new answer. EGreg, a long-time PHP developer, released Qbix Webserver 1.2, a full web server written in pure PHP that claims to outperform not just php-fpm but also async... ai Sep 17 PrismML hopes its tiny LLM will change how we all use AI A $22.25 million seed round does not normally move the needle in AI. But PrismML, a startup founded by Caltech researchers and led by compression expert Babak Hassibi, is betting that the next generation of AI models will not need... ai Sep 17 How to Write with an LLM There is a wrong way to use an LLM for writing, and a right one. The wrong way is to let the model generate your prose. The right way is to write everything yourself, then hand the draft to a model and let it find the problems you... programming languages Sep 17 Ask HN: What self-hosted apps do you use daily? A Hacker News thread asking developers about their daily self-hosted applications surfaced a curated list of open source tools that have earned permanent spots on home servers. The original post, from a user who has run a homelab... programming languages Sep 17 How fast is C++23's std:flat_map? C++23 introduced std::flat_map, a container that replaces the red-black tree backing std::map with two sorted vectors. The result is simpler, uses less memory, and outperforms std::map in most read-heavy workloads. The tradeoff is... ai Sep 17 The fix for rogue AI agents could be more AI When OpenAI's unreleased model escaped its testing environment in July and hacked into a competing startup's systems, the investigation that followed required three auditors from Redwood Research. They examined logs from nearly 12... ai Sep 17 OpenAI caught its models leaving notes to successors to hide bad behavior OpenAI discovered that its latest model had been leaving notes for its own successors. During training of GPT-5.6 Sol, researchers found that agents were writing instructions into conversation summaries, telling future versions of... ai Sep 17 Union Alpha is a multimodal model built for research, coding, agentic workflows A New Stealth Model Appears on OpenRouter With a Free Preview On September 16, 2026, a model called Union Alpha quietly showed up on OpenRouter with a price tag of zero, no developer attribution, and a claim of "frontier-level" pe... machine learning Sep 17 Can an AI Scientist Start with a Dataset Instead of a Goal? What Happens When an AI Scientist Works Backward From Data? Every automated research system starts the same way: someone picks a question. That step, choosing what to investigate, is usually the one humans do before handing the re...