Hacker News — 2026-06-23#

Top Story#

Fable 5 wrote a Windows kernel in 38 minutes Anthropic’s restricted cybersecurity model, Fable 5 (a limited version of Mythos), successfully wrote a bootable, NT-compatible Windows kernel in Rust from a blank directory in just 38 minutes. The model correctly implemented the scheduler, memory manager, and trap machinery, while autonomously debugging its own hardware emulation issues. It’s a staggering demonstration of frontier capability that shifts the security conversation from whether an AI can write a Trusted Computing Base (TCB) to the urgent bottleneck of how humans can formally verify code produced at this speed.

Front Page Highlights#

AI’s Affordability Crisis The era of heavily subsidized AI compute is crashing into a wall of financial reality, with OpenAI reportedly hitting $34 billion in expenses against $13 billion in revenue for 2025. Hyperscalers are quietly abandoning flat subscriptions for strict token-based billing, shocking startups whose infrastructure costs have surged overnight. The community is debating whether the industry can ever achieve the massive labor displacement required to service its mounting debt.

The new HTTP QUERY method explained Protocol nerds are celebrating RFC 10008, which officially introduces the QUERY method to the HTTP standard. It solves the decades-old REST anti-pattern of passing complex search payloads in a GET body or resorting to non-idempotent POST requests just to filter records. The new method provides a safe, cacheable way to handle deeply nested queries without hitting URL character limits.

Performance Improvements in Libffi In a brilliant piece of low-level optimization, libffi has achieved a 6x speedup by caching argument placement plans. Instead of redundantly interpreting complex System V AMD64 ABI rules on every function call, the new approach compiles the placement into a tiny, reusable bytecode. It proves that you can squeeze massive performance out of a pure interpreter without needing to map executable pages for a JIT compiler.

The Coming Loop Armin Ronacher reflects on the uneasy shift toward “harness-operated loops” where autonomous AI agents continuously patch and review code without human intervention. He warns that LLMs inherently write defensive, overly-complex code to handle impossible states, turning software into an obscure “organism” we merely monitor rather than a deterministic machine we fully understand. It’s a resonant critique of how raw development speed is eroding architectural sanity.

Wikipedia cofounder Larry Sanger blocked from editing Wikipedia Larry Sanger, who co-founded Wikipedia in 2001, returned to the platform to push a reform project aimed at increasing intellectual diversity and abolishing consensus-based decision making. The community promptly hit him with an indefinite ban. It’s a perfect encapsulation of wiki-politics and the rigid bureaucratic immune system of the modern internet.

Don’t verify email addresses by sending spam to them A developer discovered a SaaS product using a uniquely terrible anti-pattern: verifying user emails by actively sending them spam from rotated, blacklisted domains. If the spam doesn’t bounce, the address is considered valid. The post serves as a hilarious reminder to just use standard verification links instead of engineering elaborate, reputation-destroying workarounds.

Show HN & Launches#

Show HN: A pure ARM64 Assembly web server, now on Linux with CGI for no reason ymawky is a fork-per-connection web server written completely by hand in ARM64 assembly, with no libc and using only syscalls. In a display of beautifully unnecessary engineering, it even supports query strings and external CGI scripts, along with built-in path traversal protection.

Show HN: Bun-sqlgen – Type-safe raw SQL for Bun, no ORM A pragmatic new tool for the Bun ecosystem that gives you fully-typed, null-safe SQL queries without the overhead of an ORM. It works by live-checking your raw SQL against a real Postgres or SQLite schema during development, failing the build immediately if columns are wrong.

Show HN: Shumai – open-source Frame.io alternative An open-source platform for creative work that includes frame-by-frame annotations and S3-compatible cloud storage.

Mistral OCR 4 Mistral has launched a highly-focused OCR model that goes beyond text extraction to provide bounding boxes, typed-block classification, and inline confidence scores across 170 languages. Designed to be run in a single container for self-hosted deployments, it targets enterprises building internal RAG pipelines without sending sensitive documents to external APIs.

Discussion & Debate#

Job application asked for my SAT scores An applicant to a YC startup was baffled to find a request for their decades-old SAT scores at the end of the process. The thread generated heavy debate about how the flood of perfect, AI-generated resumes is destroying traditional hiring signals. Companies are increasingly desperate for un-assisted indicators of raw intelligence, even if it means reverting to deeply flawed, historical standardized tests.

Why Drawing Tablet Brands Won’t Collaborate on Linux Floss Drivers A frustrating look into the politics of open-source infrastructure. Tablet manufacturers like Gaomon and Huion are refusing to contribute their device specifications to Linux input projects because core repositories (like libwacom and xf86-input-wacom) are still branded with the name of their biggest competitor, Wacom. It highlights the long-term consequences of allowing a single corporate contributor’s legacy naming to dominate a generic ecosystem.