GPT-5.5

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OpenAI releases GPT-5.5, a more intelligent and efficient model that can handle complex tasks. GPT-5.5 excels at coding, research, and everyday work on a computer, providing better results with fewer tokens.

I am building a cloud

The author is building exe.dev, a cloud platform that addresses the limitations of current cloud services, allowing users to run VMs on their own resources and manage them easily. The goal is to create a cloud that is more flexible and user-friendly, with local NVMe storage, global regions, and a simple, intuitive interface.

Palantir employees are starting to wonder if they're the bad guys

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Palantir employees are questioning the company's involvement in immigration enforcement and its relationship with the Trump administration. The company's leadership has been criticized for its handling of internal dissent and its defense of its work with ICE and the US military.

Bitwarden CLI compromised in ongoing Checkmarx supply chain campaign

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Bitwarden CLI 2026.4.0 was compromised through a GitHub Action in its CI/CD pipeline as part of the Checkmarx supply chain campaign. Users are advised to review CI logs and rotate exposed secrets.

An update on recent Claude Code quality reports

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Claude's responses worsened for some users due to three separate changes affecting Claude Code, the Claude Agent SDK, and Claude Cowork. We've fixed the issues and will implement changes to prevent similar problems in the future.

If America's so rich, how'd it get so sad?

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The US has experienced a sharp decline in self-reported happiness since 2020, with no recovery, despite a strong economy and low unemployment. The culprit is likely the ongoing COVID pandemic and its aftermath, including inflation, economic uncertainty, and a uniquely negative news environment.

Meta to cut 10% of jobs

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Meta plans to start layoffs on May 20 to improve efficiency and offset investments in metaverse and AI efforts. The company will let go of employees who made meaningful contributions due to failed metaverse efforts and increased AI investments.

Investigation uncovers two sophisticated telecom surveillance campaigns

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Citizen Lab exposed two surveillance campaigns using "ghost" companies to exploit phone network vulnerabilities. The campaigns targeted individuals worldwide, using SS7 and Diameter flaws to geolocate phones.

French government agency confirms breach as hacker offers to sell data

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France's ANTS agency disclosed a data breach after a threat actor claimed stealing citizen data, potentially exposing 19 million records. The agency advises users to be vigilant about suspicious messages and has notified authorities, but no action is required.

Arch Linux Now Has a Bit-for-Bit Reproducible Docker Image

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Arch Linux now has a reproducible Docker image under the "repro" tag, but pacman is not usable out of the box due to stripped pacman keys. Users must regenerate the pacman keyring before installing packages.

'Hairdryer used to trick weather sensor' to win Polymarket bet

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French police investigate possible tampering with weather readings at Charles de Gaulle airport to influence Polymarket bets. A hairdryer may have been used to manipulate temperature readings, causing gamblers to win thousands of dollars.

Show HN: Honker – Postgres NOTIFY/LISTEN Semantics for SQLite

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Honker is a SQLite extension and language bindings that add durable pub/sub, task queue, and event streams to SQLite without client polling or a daemon/broker, allowing atomic business writes and side-effect enqueues. It achieves single-digit millisecond reaction time and supports various languages including Python, Node, Rust, Go, Ruby, Bun, and Elixir.

U.S. Soldier Charged with Using Classified Info to Profit from Prediction Market

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US Army Soldier Gannon Ken Van Dyke charged with using classified information for personal gain, making over $400,000 in illegal trades on Polymarket. He faces up to 40 years in prison for violating federal laws and misusing national security information.

Incident with multple GitHub services

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GitHub's Status Page - Incident with multiple GitHub services.

Raylib v6.0

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Raylib 6.0 is released with major updates including a new software renderer, redesigned fullscreen modes, and improved text management API. The release also includes new platform backends, a file system API, and a tool for managing examples.

To Protect and Swerve: NYPD Cop Has 547 Speeding Tickets

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James Giovansanti, a NYPD officer, has accumulated 547 speeding tickets in Staten Island since 2022, averaging one ticket every other day. His record makes him the second-most-reckless driver in the city, posing a unique danger to himself and others.

Our newsroom AI policy

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Ars Technica uses generative AI tools in its workflow, but only with human oversight and standards. The site's editorial text is written by humans, and AI output is never treated as an authoritative source.

Girl, 10, finds rare Mexican axolotl under Welsh bridge

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A 10-year-old girl named Evie found an endangered Mexican axolotl under a bridge in Wales, saving its life. The axolotl, named Dippy, was the first documented discovery in the UK and is one of only 50 to 1,000 left globally.

MeshCore development team splits over trademark dispute and AI-generated code

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A team member, Andy Kirby, secretly used AI-generated code to take over the MeshCore ecosystem, sparking a dispute over ownership and control. The core team has now separated from Andy and will continue to develop and release MeshCore firmware and app updates on their official website, meshcore.io.

US Department of Justice has officially reclassified cannabis as less dangerous

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The US Department of Justice reclassified cannabis as less dangerous, moving it from Schedule I to Schedule III, allowing for increased research and access. The change is seen as symbolic, but could lead to policymakers considering full legalization.

Writing a C Compiler, in Zig (2025)

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This is a series of articles I wrote while writing paella, following Nora Sandler's Writing a C Compiler. It was both an exercise to learn Zig and a way to waste time instead of looking for work, as I am currently "between jobs". I did not edit them as I collect them here outside of fixing some broken links.

Tempest vs. Tempest: The Making and Remaking of Atari's Iconic Video Game

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The user discussed three book-length projects about classic video games: TEMPEST vs TEMPEST, IRIDIS ALPHA THEORY, and psychedelia syndrome, which delve into the mechanics and source code of the games. The books are free to download and offer in-depth analysis of the games.

Using the internet like it's 1999

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The author believes the internet has become a controlled echochamber where people are fed algorithmically generated content, and suggests using older technologies like RSS feeds, IRC, and email to reclaim agency over attention and information.

Show HN: Tolaria – open-source macOS app to manage Markdown knowledge bases

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Tolaria is a Mac app for managing markdown knowledge bases with features like offline use, open source, and keyboard-first design. It's built for power-users with a focus on flexibility and portability.

OpenAI's response to the Axios developer tool compromise

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OpenAI is updating security certificates for macOS apps due to a third-party developer library, Axios, being compromised. Users must update their apps to the latest versions by May 8, 2026, to prevent potential risks of fake apps.

Astronomers find the edge of the Milky Way

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A team of astronomers found that the Milky Way's star-forming disk ends at 35,000-40,000 light-years from its center. Stars beyond this point are older and likely migrated outward due to the galaxy's spiral waves.

A Boy That Cried Mythos: Verification Is Collapsing Trust in Anthropic

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The user criticizes Anthropic's Claude Mythos Preview for exaggerating its cybersecurity capabilities, citing a lack of evidence and quantification in the system card, and claims that other models can reproduce the same results for much cheaper. The user argues that the Mythos system card lacks essential information, such as CVE enumeration, responsible disclosure timelines, and vendor ...

Anthropic's Claude Desktop App Installs Undisclosed Native Messaging Bridge

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My phone replaced a brass plug

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The author spent six months developing a computer vision model to automate scoring of shooting targets, using a combination of OpenCV and YOLOv8, and eventually created an offline-first app to track shooting performance.

Spam in conversational replies to blog posts

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A spammer used AI to post three fake comments on a blog, each pretending to be a reply to the others, with a suspicious link in the middle one. The comments were spaced 3 minutes apart and came from the same IP address in the Philippines.

Borrow-checking without type-checking

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The user is designing a toy language with dynamic typing, inline values, stack allocation, interior pointers, single ownership, and a limited form of borrowing, aiming to provide the simplicity of value semantics while keeping the performance of reference semantics. The language uses reference counting to enforce mutable value semantics, with a focus on predictable performance and a simple ...

How the Tech World Turned Evil

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Silicon Valley tech leaders like Peter Thiel and Marc Andreessen are framing their economic self-interest as a religious imperative, warning of a war between good (AI) and evil (government regulation) and predicting a Singularity where human intelligence is eclipsed by intellectually superior computers. The tech industry has shifted from a counterculture that promised to disperse power and ...

MacBook Neo and How the iPad Should Be

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The writer argues that iPads should be touch-only devices with unique, weird apps, while MacBooks should be for multitasking and keyboard-based work.

People Do Not Yearn for Automation

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The tech industry's "software brain" thinking, which sees the world as databases to be controlled, is causing a disconnect with regular people who experience AI as a threat to their humanity. This thinking is leading to a failure to understand why people dislike AI, as it ignores the limits of software and the complexity of human experience.

UK Biobank health data keeps ending up on GitHub

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UK Biobank has used copyright takedown notices to remove health data from GitHub, targeting 110 requests since July 2025. The notices mostly target Jupyter or R notebooks, genetic and genomic data files, and tabular datasets containing participant health records.

It's time to reclaim the word "Palantir" for JRR Tolkien

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The speaker, a former Palantir employee, argues that Palantir's tools are used for surveillance and prediction, leading to accountability loss and institutional bias. They aim to reclaim language and challenge the company's ontology, which can be used to harm people and reflect authoritarian worldviews.

Show HN: Built a daily game where you sort historical events chronologically

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Sort 6 historical events intochronological order. April 23, 2026Puzzle #9Created by Damian [email protected]

Fundamental Theorem of Calculus

The Riemann integral is a mathematical concept that approximates the area under a graph by using rectangles and partitions, and a function is Riemann integrable if the difference between the upper and lower sums is less than any given positive value. The Fundamental Theorem of Calculus states that the definite integral of a function is equal to the difference of its antiderivative evaluated ...

The end of responsive images

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The author of the article, a former Chair of the RICG, confesses to creating the responsive image syntax that has caused frustration for developers. They reveal that they hated the syntax but fought for it because they knew developers would have done it wrong.

TorchTPU: Running PyTorch Natively on TPUs at Google Scale

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Google's Tensor Processing Units (TPUs) require a software stack that meets demands for performance, hardware portability, and reliability, leading to the development of TorchTPU, a PyTorch integration for native and efficient TPU usage. TorchTPU achieves this through its "Eager First" philosophy, Fused Eager mode, and native support for custom kernels, ensuring a seamless and ...

Microsoft offers buyouts up to 7% of US employees

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Microsoft is offering buyouts to employees whose years of service plus age total 70 or more, with some exceptions. This move aims to reduce headcount by 8,750 employees, or 7% of its US workforce.

I spent years trying to make CSS states predictable

The author describes a problem with CSS where component state is managed through overlap, leading to complexity and potential bugs. They created a system called Tasty that allows component state to be expressed declaratively, making it easier to extend or change components without reopening the state-resolution problem.

Do you want the US to "win" AI?

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The writer is concerned about the direction of AI development and its potential impact on society, preferring a more nuanced approach to technology. They question Elon's worldview and the value of a society where AI is controlled by powerful individuals.

GPT-5.5: Mythos-Like Hacking, Open to All

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OpenAI's GPT-5.5 model outperforms previous versions in vulnerability detection, reducing the miss rate to 10%. It also excels in black box testing and white box testing, making it a key part of the stack for penetration testing workflows.

Email could have been X.400 times better

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Email's early history involved a complex system called X.400, which had features like recall and encryption, but was difficult to use and implement. SMTP, a simpler protocol, eventually became the standard for email, outliving X.400 due to its ease of use and rapid iteration.

Middle Eastern News Sites Are U.S. Government Propaganda Ops

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Al-Fassel and Pishtaz News are propaganda websites funded by the US government, spreading pro-US and anti-Iranian content. They use social media to disseminate biased information, often masquerading as independent news outlets.

Flow Map Learning via Nongradient Vector Flow [pdf]

SGFlow is a method for learning flow maps that bypasses explicit invertibility constraints and expensive differentiation through model iteration, allowing for faster sampling from diffusion and flow models. SGFlow trains a model to compute both the ODE solutions and the implied velocity from scratch by following non-conservative dynamics, achieving favorable results on the CIFAR image ...

X is shutting down Communities because of low usage and lots of spam

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X is removing Communities due to low usage and high abuse rates, contributing to 80% of spam reports and scams. The company will invest in XChat and introduce new features like joinable group chats and Custom Timelines for Premium subscribers.

Be sinceerly human – AI to undo your AI writing

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Ben expressed interest in connecting with CEOs for potential collaborations. He received brief replies from 4 CEOs, including some with typos and a mistaken name.