Ask HN: What interesting projects have you build using Claude v4?

Claude 4 got released recently, and I would love to see if people have already started building projects with Claude 4 and how you are integrating it into your workflow.

Postgres IDE in VS Code (techcommunity.microsoft.com)

Find Your People (foundersatwork.posthaven.com)

Beyond Semantics: Unreasonable Effectiveness of Reasonless Intermediate Tokens (arxiv.org)

Into The Tunnel: The secret life of wind tunnels (jordanwtaylor2.substack.com)

Types of optical systems in a lens designer's toolbox (2020) (pencilofrays.com)

Caesar's Last Breath (charliesabino.com)

The metre originated in the French Revolution (abc.net.au)

Positional preferences, order effects, prompt sensitivity undermine AI judgments (cip.org)

You Don't Need Re-Ranking: Understanding the Superlinked Vector Layer (superlinked.com)

Show HN: Samchika – A Java Library for Fast, Multithreaded File Processing (github.com)

Sesame Scheme: Unintended Consequences of Allergen Food Labeling (choicesmagazine.org)

Why I no longer have an old-school cert on my HTTPS site (rachelbythebay.com)

Designing type inference for high quality type errors (blog.polybdenum.com)

Remembering Alasdair MacIntyre (wordonfire.org)

Slime (2021) (granta.com)

MCP is the coming of Web 2.0 2.0 (anildash.com)

Writing A Job Runner (In Elixir) (Again) (10 years later) (github.com)

Christopher Hill's History from Below (thenation.com)

How to live on $432 a month in America (shagbark.substack.com)

The Curious Case of the Pygmy Nuthatch (slate.com)

John Carmack talk at Upper Bound 2025 (twitter.com)

Tallest Wooden Wind Turbine (modvion.com)

Satellites Spotting Depth (tech.marksblogg.com)

'Turbocharged' Mitochondria Power Birds' Epic Migratory Journeys (quantamagazine.org)

Alberta separatism push roils Canada (nytimes.com)

Bits with Soul (darwin.cam.ac.uk)

Show HN: Defuddle, an HTML-to-Markdown alternative to Readability (github.com)

Sugar-Coated Poison: Benign Generation Unlocks LLM Jailbreaking (arxiv.org)

Attention Wasn't All We Needed (stephendiehl.com)

KumoRFM: A Foundation Model for In-Context Learning on Relational Data (kumo.ai)

Measuring Lunar North and South Polar Regions (iopscience.iop.org)

Quantum Picturalism (quantuminpictures.org)

That fractal that's been up on my wall for years (chriskw.xyz)

Claude 4 (anthropic.com)

How I ended up flying for Yemen's national airline – and survived (pprune.org)

I Hated Smart Glasses, but Google's Android XR Let Me See a New Future (cnet.com)

Does Earth have two high-tide bulges on opposite sides? (2014) (physics.stackexchange.com)

Mozilla to shut down Pocket and Fakespot (support.mozilla.org)

We’ll be ending web hosting for your apps on Glitch (blog.glitch.com)

Fast Allocations in Ruby 3.5 (railsatscale.com)

Ancient law requires a bale of straw to hang from Charing Cross rail bridge (ianvisits.co.uk)

Improving performance of rav1d video decoder (ohadravid.github.io)

Sketchy Calendar (inkandswitch.com)

How to cheat at settlers by loading the dice (2017) (izbicki.me)

32 bits that changed microprocessor design (spectrum.ieee.org)

Making Postgres Distributed with FoundationDB (fabianlindfors.se)

I Built My Own Audio Player (nexo.sh)

A South Korean grand master on the art of the perfect soy sauce (theguardian.com)

The Impact of Post-Tenure Evaluations on Faculty Productivity and Selection (papers.ssrn.com)

A Formal Mathematical Investigation on the Validity of Kellogg's Glaze Claims (old.reddit.com)

Ask HN: What interesting projects have you build using Claude v4?

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