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Simon Willison's Weblog Supports Webmention

Quoting Claude Opus 4.5 system prompt

If the person is unnecessarily rude, mean, or insulting to Claude, Claude doesn't need to apologize and can insist on kindness and dignity from the person it’s talking with. Even if someone is frustrated or unhappy, Claude is deserving of respectful engagement.

Claude Opus 4.5 system prompt, also added to the Sonnet 4.5 and Haiku 4.5 prompts on November 19th 2025

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

Martin Alderson
• Martin Alderson

I Finally Found a Use for IPv6

Using IPv6 with Cloudflare to run multiple services on a single server without a reverse proxy

Krebs on Security
• BrianKrebs

Is Your Android TV Streaming Box Part of a Botnet?

On the surface, the Superbox media streaming devices for sale at retailers like BestBuy and Walmart may seem like a steal: They offer unlimited access to more than 2,200 pay-per-view and streaming services like Netflix, ESPN and Hulu, all for a one-time fee of around $400. But security experts warn these TV boxes require intrusive software that forces the user's network to relay Internet traffic for others, traffic that is often tied to cybercrime activity such as advertising fraud and account takeovers.

Simon Willison's Weblog Supports Webmention

Claude Opus 4.5, and why evaluating new LLMs is increasingly difficult

Anthropic released Claude Opus 4.5 this morning, which they call "best model in the world for coding, agents, and computer use". This is their attempt to retake the crown for best coding model after significant challenges from OpenAI's GPT-5.1-Codex-Max and Google's Gemini 3...

Simon Willison's Weblog Supports Webmention

sqlite-utils 3.39

sqlite-utils 3.39 I got a report of a bug in sqlite-utils concerning plugin installation - if you installed the package using uv tool install further attempts to install plugins with sqlite-utils install X would fail, because uv doesn't bundle pip by default. I had the same ...

Eric Migicovsky's Blog RSS Feed

Pebble Watch Software Is Now 100% Open Source + Tick Talk #4 - PT2 Demos!

Another big Pebble update today! TLDR: Yesterday, Pebble watch software was ~95% open source. Today, it’s 100% open source. You can download…

Computer Things Supports Webmention

One more week to the Logic for Programmers Food Drive

Simon Willison's Weblog Supports Webmention

sqlite-utils 4.0a1 has several (minor) backwards incompatible changes

I released a new alpha version of sqlite-utils last night - the 128th release of that package since I started building it back in 2018. sqlite-utils is two things in one package: a Python library for conveniently creating and manipulating SQLite databases and a CLI tool for ...

Pluralistic: Daily links from Cory Doctorow
• Cory Doctorow

Pluralistic: Cooking in Maximum Security (24 Nov 2025)

Today's links Cooking in Maximum Security: A companion volume to "Prisoners' Inventions." Hey look at this: Delights to delectate. Object permanence: Cursed house; Randall Munroe's stick figures; Reverse engineering a gig work platform; Barbie surveillance toy teardown; Labor...

IT Notes
• Stefano Marinelli

Why I (still) love Linux

I know, this title might come as a surprise to many. Or perhaps, for those who truly know me, it won’t. I am not a fanboy. The BSDs and the illumos distributions generally follow an approach to design and development that aligns more closely with the way I think, not to men...

Jim Nielsen’s Blog Valid

My Number One “Resource Not Found”

The data is in.

The number one requested resource on my blog which doesn’t exist is:

/robots.txt

According to Netlify’s analytics, that resources was requested 15,553 times over the last thirty days.

Same story for other personal projects I manage:

“That many requests and it serves a 404? Damn Jim, you better fix that quick!”

Nah, I’m good.

Why fix it? I have very little faith that the people who I want most to respect what’s in that file are not going to do so.

So for now, I’m good serving a 404 for robots.txt.

Change my mind.

Change my mind meme with guy sitting in front of a table and the text “just gonna let `robots.txt` return a 404. CHANGE MY MIND” underneath.


Reply via: Email · Mastodon · Bluesky

Fabien Sanglard

Quake Engine Indicators

Simon Willison's Weblog Supports Webmention

"Good engineering management" is a fad

"Good engineering management" is a fad Will Larson argues that the technology industry's idea of what makes a good engineering manager changes over time based on industry realities. ZIRP hypergrowth has been exchanged for a more cautious approach today, and expectations of m...

Troy Hunt Supports Webmention
• Troy Hunt

Weekly Update 479

Weekly Update 479

I gave up on the IoT water meter reader. Being technical and thinking you can solve everything with technology is both a blessing and a curse; dogged persistence has given me the life I have today, but it has also burned serious amounts of time because I never want to

Simon Willison's Weblog Supports Webmention

Agent design is still hard

Agent design is still hard Armin Ronacher presents a cornucopia of lessons learned from building agents over the past few months. There are several agent abstraction libraries available now (my own LLM library is edging into that territory with its tools feature) but Armin h...

Simon Willison's Weblog Supports Webmention

Olmo 3 is a fully open LLM

Olmo is the LLM series from Ai2 - the Allen institute for AI. Unlike most open weight models these are notable for including the full training data, training process and checkpoints along with those releases. The new Olmo 3 claims to be "the best fully open 32B-scale thinkin...

Pluralistic: Daily links from Cory Doctorow
• Cory Doctorow

Pluralistic: Boss preppers (22 Nov 2025)

Today's links Boss preppers: What does a captain of industry have to offer after the shit hits the fan? Hey look at this: Delights to delectate. Object permanence: Yahoo blocks webmail for adblockers; Badly forgiving student debt. Upcoming appearances: Where to find me. Recen...

Ken Shirriff's blog Updates instantly via WebSub
Ken Shirriff

Unusual circuits in the Intel 386's standard cell logic

I've been studying the standard cell circuitry in the Intel 386 processor recently. The 386, introduced in 1985, was Intel's most complex processor at the time, containing 285,000 transistors. Intel's existing design techniques couldn't handle this complexity and the chip be...

Simon Willison's Weblog Supports Webmention

We should all be using dependency cooldowns

We should all be using dependency cooldowns William Woodruff gives a name to a sensible strategy for managing dependencies while reducing the chances of a surprise supply chain attack: dependency cooldowns. Supply chain attacks happen when an attacker compromises a widely us...

Jeff Geerling
• Jeff Geerling

Air Lab is the Flipper Zero of air quality monitors

Air Lab is the Flipper Zero of air quality monitors

Air Lab AQI Monitor Professor Robin

This air quality monitor costs $250. It's called the Air Lab, and I've been using it to measure the air in my car, home, studio, and a few events over the past few months. And in using it over the course of a road trip I learned to not run recirculate in my car quite as often—more on that later.

Networked Artifacts built in some personality:

Jeff Geerling