FeedCity: Featured

Changes in the system prompt between Claude Opus 4.6 and 4.7

Anthropic are the only major AI lab to publish the system prompts for their user-facing chat systems. Their system prompt archive now dates all the way back to Claude 3 in July 2024 and it's always interesting to see how the system prompt evolves as they publish new models. ...

Simon Willison's Weblog
18 Apr 23:30

Claude system prompts as a git timeline

Research: Claude system prompts as a git timeline

Anthropic publish the system prompts for Claude chat and make that page available as Markdown. I had Claude Code turn that page into separate files for each model and model family with fake git commit dates to enable browsing the changes via the GitHub commit view.

Tags: system-prompts, anthropic, claude, generative-ai, ai, llms

Global News Podcast
18 Apr 19:00

The Happy Pod: Filling the empty chair left by my best friend

26:30

We meet the man helping to tackle loneliness by offering strangers somewhere to sit and chat. Dean Perryman started the Empty Chairs project, honouring the memory of his best friend. After he posted the concept online, it has been replicated around the world. Also: How tech...

Daring Fireball
18 Apr 18:06 • John Gruber

★ ‘A Reading Room on Wheels, a Lover’s Lane, and, After 11 PM, a Flophouse’

Vittoria Benzine, at Artnet (via Oliver Thomas): The singular American filmmaker Stanley Kubrick saw the little details. He even saw the future. But, most of all, he saw people, with all their quirks. Kubrick’s films, from Dr. Strangelove (1964) to The Shining (1980), of...

Daring Fireball
18 Apr 16:54 • John Gruber

Mac Mini and Mac Studio Supply Shortages

wsj.com/tech/personal-tech/apple-mac-mini-supply-3e7a7509?st=fKpr4Q

Nicole Nguyen, writing for The Wall Street Journal (gift link): Mac Minis with larger-capacity RAM chips — a base M4 model with 32GB of RAM, starting at $999, and the M4 Pro models with 64GB of RAM, starting at $1,999 — are “currently unavailable” on Apple.com. And estim...

Global News Podcast
18 Apr 04:26

US and Tehran dispute the future of Iran's uranium

26:18

President Trump has again insisted that Tehran is ready to hand over its enriched uranium as part of a deal to end the war, despite Iran saying no such agreement is in place, and that its nuclear material is "going nowhere". Iran says the Strait of Hormuz is open - but shipp...

Simon Willison's Weblog
18 Apr 04:03

Adding a new content type to my blog-to-newsletter tool

Agentic Engineering Patterns > Here's an example of a deceptively short prompt that got a lot of work done in a single shot. First, some background. I send out a free Substack newsletter around once a week containing content copied-and-pasted from my blog. I'm effecti...

Daring Fireball
18 Apr 00:45 • John Gruber

Apple’s Developer Guidelines for Ratings and Review Prompts

developer.apple.com/design/human-interface-guidelines/ratings-and-reviews#Best-practices

Apple Design: Avoid pestering people. Repeated rating requests can be irritating, and may even negatively influence people’s opinion of your app. Consider allowing at least a week or two between requests, prompting again after people demonstrate additional engagement wit...

Daring Fireball
18 Apr 00:45 • John Gruber

Follow-Up Regarding App Store Reviews, Which Are Definitely Busted

daringfireball.net/linked/2026/04/16/app-store-reviews-are-busted

I wrote yesterday: And the apps that do the right thing — like Godier’s Current — and never solicit a review like a needy hustler are penalized. On Mastodon, Steven Troughton-Smith responded: Review prompts are the difference between a great app getting five positi...

xkcd.com
18 Apr 00:42

Europa Missions

Before resurfacing, they promise to inspect the ice for any evidence of hockey-playing life.

Simon Willison's Weblog
18 Apr 00:15

Join us at PyCon US 2026 in Long Beach - we have new AI and security tracks this year

This year's PyCon US is coming up next month from May 13th to May 19th, with the core conference talks from Friday 15th to Sunday 17th and tutorial and sprint days either side. It's in Long Beach, California this year, the first time PyCon has come to the US West Coast since...

Rick Beato
17 Apr 21:19

Charlie Puth on pop music complexity #piano #popmusic #shorts

kottke.org
17 Apr 20:57 • Jason Kottke

Nancy Friedman notes the decline in quality in movie...

Nancy Friedman notes the decline in quality in movie taglines. “As movies have become louder, flashier, and more expensive, their taglines have atrophied: they’re limp, lackluster, and uninspiring.”

kottke.org
17 Apr 20:21 • Jason Kottke

The 16th season of the Dissect podcast is a deep dive...

The 16th season of the Dissect podcast is a deep dive into Daft Punk; here’s the 1st episode.

Longreads
17 Apr 19:32 • Carolyn Wells

A Day with England’s Hunt Saboteurs

"Armed with drones, balaclavas and vegan sausage rolls."

kottke.org
17 Apr 19:12 • Jason Kottke

Bodega Cats of New York

The Bodega Cats of New York project documents the working cats of NYC’s delis, bodegas, and corner stores. The cat at the local deli wasn’t a pet. She knew the regulars. She kept the mice out. She gave people a reason to walk an extra block. And she was technically a violation of city health code. That was six years ago. Since then, the project has documented over 150 shops, collected 13,500 petition signatures, and helped introduce the first legislation in New York City history to classify bodega cats as working animals. Available soon in book form. Tags: cats · NYC · photography

kottke.org
17 Apr 18:30 • Jason Kottke

A few years back, the Mini Cooper’s taillights were...

A few years back, the Mini Cooper’s taillights were designed to look like the Union Jack flag, which is fine until you turn the blinker on and it looks like an arrow pointing in the wrong direction. I hated this design the moment I saw it on the road.

kottke.org
17 Apr 17:54 • Jason Kottke