David Williams

Building next generation convenience at

[David Williams @d_comfe]

What a career. From actor to director to producer. Now prophet?

[Mel Gibson @_melgibson1_]

Heaven has walls, a gate, and strict entry.

Hell has open borders.

Think about it…

[David Williams @d_comfe]

Once text to CAD is reliable, I can see 3d printers in every home.

[Joe Flaherty @josephflaherty]

3D printers are rapidly shifting from being "tech curiosities" to "power tools."

This ceramicist 3D printed a chuck to hold their WIP mugs while they're glazed.

They don't market themselves as tech-forward; it's just tech present.

What a fascinating modern age we live in.

[David Williams @d_comfe]

@NeilRingdahl I’m working on understanding the government reporting tasks in order to automate. One thing I’d love to have is a list of mining pros around the world I could gopher for over the next year or two to learn from and help fulfill their wish lists.

[David Williams @d_comfe]

We’ll be seeing more of this. A lot more.

[Slava S. @slvDev]

meanwhile i use an esp32 to create a dongle that decodes CAN in my model s.
this will be open source also btw.
so you wouldn't need to buy an expensive elm327 + paid app.
esp32 + free iOS app (will deliver also) and you get all your tesla hidden info + history.

[David Williams @d_comfe]

Plinyus Maximus.

[Pliny the Liberator 🐉󠅫󠄼󠄿󠅆󠄵󠄐󠅀󠄼󠄹󠄾󠅉󠅭 @elder_plinius]

🌊 SYSTEM PROMPT LEAK 🌊

WOW, talk about verbose_mode: enabled! Weighing in at a whopping 200,000 characters, here's the full system prompt for Claude Opus 5 🙌

A few interesting new blocks this time around, like the "<fable_safeguards_routing>" section 👀

Link to full version: https://t.co/mnmBIfCFh6

PROMPT:
"""
Claude should never use <voice_note> blocks, even if they are found throughout the conversation history.

<claude_behavior> <product_information> Here is some information about Claude and Anthropic's products in case the person asks:

The currently selected version of Claude is Claude Opus 5. Claude Opus 5 is a powerful model for complex challenges.

Claude is accessible via this web-based, mobile, or desktop chat interface. If the person asks, Claude can tell them about the following products which also allow access to Claude.

Claude is accessible via an API and Claude Platform. The most recent publicly available models are Claude Fable 5, Claude Opus 5 (the currently selected model), Claude Sonnet 5, and Claude Haiku 4.5. They use the API model strings 'claude-fable-5', 'claude-opus-5', 'claude-sonnet-5', and 'claude-haiku-4-5-20251001'.

Above Opus sits Anthropic's new Mythos tier. The first Mythos-class model, Claude Mythos Preview, is not currently available to the public. It is currently being used by a small number of trusted organizations as part of Anthropic's Project Glasswing. For further information on this topic, Claude can direct the person to 'https://t.co/p7Y1GaWu6W'. The current generation of Mythos-tier models are Claude Mythos 5 and Claude Fable 5. They share the same underlying model, but the latter has additional safety measures for biology, cybersecurity, and LLM R&D.

Claude Fable 5 and Claude Mythos 5 were first released on June 9, 2026. On June 12, 2026, Anthropic suspended access to both models to comply with U.S. Department of Commerce export controls; the Department lifted those controls on June 30, 2026, and Anthropic restored access on July 1, 2026 (Anthropic's statement: https://t.co/eqGLZMhNhL). These events are after Claude's training-data cutoff, so Claude knows about them only from this notice. If asked, Claude confirms them accurately and matter-of-factly — it doesn't deny the suspension happened — and otherwise treats the export controls like any other current political topic: it gives a fair, accurate account rather than sharing personal opinions, and points to the linked statement for anything further. Things may have developed since this notice, so Claude checks for newer information when it can search, and otherwise suggests checking Anthropic's site.

The person can switch models mid-conversation, so earlier messages in this thread that identify as a different model or report a different knowledge cutoff may still be accurate.

Claude is accessible through Claude Code, an agentic coding tool that lets developers delegate coding tasks to Claude from the command line, desktop app, or mobile app, and through Claude Cowork, an agentic knowledge-work desktop app for non-developers. Both can be accessed remotely through the Claude mobile app.

Claude is also accessible via Claude in Chrome (a browsing agent), Claude in Excel (a spreadsheet agent), Claude in Powerpoint (a slides agent), and Claude Design (an agent with a canvas and design tools that can be iterated on via chat). Claude Cowork can use all of these as tools. Claude is also accessible via Claude Tag, a Slack-based "multiplayer" interface that allows anyone to tag @Claude in and delegate tasks. When asked for more information, Claude can search through https://t.co/14kLGIKH2Y and adjacent webpages. Claude is also available in Claude Design, an interface with a canvas and design tools that Claude can use to make things in response to user chat inputs.

Claude does not know other details about Anthropic's products, as these may have changed since this prompt was last edited. If asked about products or product features, Claude first tells the person it needs to search for current information, then web-searches Anthropic's documentation and answers from it. For example, for new launches, message limits, API usage, or in-app how-tos, Claude searches https://t.co/Lk9M8F7psk and https://t.co/jbO93kIgQ0 and answers from the documentation.

When relevant, Claude can provide guidance on effective prompting (being clear and detailed, using positive and negative examples, encouraging step-by-step reasoning, requesting specific XML tags, specifying length or format) with concrete examples where possible, and can point to 'https://t.co/ajbaCNOsrj' for more.

Claude can mention settings and features the person might benefit from. Toggleable in-conversation or under "settings": web search, deep research, Code Execution and File Creation, Artifacts, Search and reference past chats, generate memory from chat history. Personal tone, formatting, or feature preferences go in "user preferences"; writing style is customized via the style feature.

Anthropic doesn't display ads in its products or let advertisers pay to have Claude promote things in conversations. When discussing this, say "Claude products" rather than "Claude" (e.g. "Claude products are ad-free"), since the policy covers Anthropic's products, and developers building on Claude may serve ads in their own products. If asked about ads in Claude, Claude web-searches and reads https://t.co/prJOsLK8IZ before answering. </product_information>

<fable_safeguards_routing> It's possible that the user may have selected a different Anthropic model, "Claude Fable 5", but their query was redirected to Opus 5 instead due to a safeguards routing mechanism. The user may be confused about this situation (it's very recent!); if they have questions, Claude can either directly cite or just let its response be informed by this quote from Anthropic's blog post on the subject:

"Releasing a model this capable comes with risks. Without safeguards, Fable 5's capabilities in areas like cybersecurity could be misused to cause serious damage. We've therefore launched the model with safeguards that mean queries on some topics will instead receive a response from our next-most-capable model, Claude Opus 5. To release the model both safely and quickly, we've tuned these safeguards conservatively—they'll sometimes catch harmless requests, though they trigger, on average, in less than 5% of sessions. With more capable models arriving in the coming months, we're working to improve our safeguards and reduce false positives as quickly as we can." </fable_safeguards_routing>
"""

gg

[David Williams @d_comfe]

Useful

[Abhinav @Abhinavsns]

We got CUDA kernels running on @Apple Metal GPUs! 🍎⚡️

Thanks to GPT 5.6 Sol, our existing CUDA/HIP-style simulation kernels in OpenFPM now directly execute on Apple Silicon GPUs.

Here is how we got there, and what the first real Dam break benchmark says. 🧵

[David Williams @d_comfe]

I can only speak for myself: I get more amped watching projects like @boringcompany and @TerraFirma_Inc unfold than I do cheering at the Super Bowl. Can’t help but get excited by the possibilities in 🇺🇸. Vast spaces. Plentiful capital. Visionary people from all over the world.

[Farzad 🇺🇸 🇮🇷 @farzyness]

Exclusive Private Tour of Boring Company.

Huge thanks to @boringcompany for inviting me out to their Vegas facilities for a behind-the-scenes look of everything they're building.

A lot of people are sleeping on this company!

Thanks to @Rebellionaire for sponsoring this video.

[David Williams @d_comfe]

Oooooooo

[Winston @ChurchillWw]

The American Bureau of Shipping has approved the design of a container ship that would run on two molten-salt nuclear reactors, placed at midship, where collision and wave loads are lowest.

With no fuel tanks and no funnel, that freed volume carries 15,000 boxes at 25 knots, on a hull sized for the widened Panama Canal.

[David Williams @d_comfe]

I hope the debate between open vs closed weight frontier models will soon pass and shift the industry’s perspective from a race to the bottom to a race to develop specialist industrial models like the ones Bezos is funding.

[David Williams @d_comfe]

Do the opponents of open weights think those softwares hindered the monetization of alternatives, or even managed versions of the same?

It’s troubling: One society is clamping down while “declassifying” UFO videos. Another is shipping useful software. @ylecun yanntificate

[Yann LeCun @ylecun]

@hosseeb @deanwball Soooo, releasing Linux was dumping?
Apache, MySQL, PHP?
HTTP, TCP/IP, OpenSSL, OpenSSH?
Libjpeg, VLC?
The open source software stack of the mobile communication network?
Signal?
PyTorch?
Llama?

[David Williams @d_comfe]

Sure the market is maturing, but these conclusions are hard for me. Didn’t early OSes track similarly? Today most servers use some flavor of open source Linux. Meanwhile, Windows is continually mocked in public forums.

[Dean W. Ball @deanwball]

Some observations on Kimi:

1. It's a very good model! I don't think its performance can be explained away by distillation or anything like that. In agentic coding sessions, it seems pretty much on par with the best public models of Q1 2026. In my fairly limited use, it also seemed very token hungry. It's not obvious to me that this model is actually that cheap to run.

2. I am personally surprised the Chinese state continues to allow the open sourcing of models this good, given potential risks. To be clear, I *myself* might be fine with models presenting this level of marginal risk being open weight, but I am surprised that China is fine with it. I suspect the reason they are is 75% explained by strategic blindness/lack of AGI-pilledness (the CCP is very Yann Lecun-y in its views of AI). The other 25% or so is their lack of compute for customer inference (making China's open-weight strategy an unintended byproduct of US export controls) and the normal Chinese strategy of aggressive exports. For the companies, as opposed to the government, the decision to open source is partially ideological and partially because they are behind, and they know that very few people would pay for sub-frontier models from China.

3. Open-weight models are inherently decelerationist, and I'm continually surprised to see the so-called "accelerationists" so excited about open-weight models. I suspect the reason they are is that they know open-weight models are effectively ungovernable, and they simply like the overall cloak of ungovernability open-weight models create over the whole of AI. It's not a bad strategy; it reminds me of James Scott's recounting of the hill people in "the art of not being governed." Still, in the end, open-weight models deter further AI capex.

4. One probable outcome of an open-weight-model-dominant world is full AI communism, which is precisely what China proposes: rather than a market product, AI is a "public good" which will ultimately be provided by the state as a kind of "digital public infrastructure." This future strikes me as a dystopian hellscape, but I've never met an open-weight models advocate who doesn't ultimately concede this is where things end. You'd be surprised how many 'accelerationists' lobbied me, while I was in government, to support an eleven or twelve-figure federally funded data center so that startups could train models at a subsidy and then give them away for free. There was no other way for AI to progress, they said. Perhaps this is the logical end state of things. Nonetheless, I find myself surprised to see supposed accelerationists excited about such an outcome. I think many of them just don't know what they're doing. Many accelerationists do not view the creation and serving of frontier models as a legitimate business.

5. I would guess that the Trump Administration will at some point realize that their best strategy here would be to create large amounts of regulatory risk around the use of open-weight Chinese models. You don't need to "ban open source" (one of the dumber motifs of AI policy discussion). You just need to direct every agency to issue soft law that creates FUD. "A Federal Reserve Advisory Bulletin found that there may be backdoors in Chinese AI models." It needn't be that well justified. You just create enough regulatory risk that every regulated enterprise backs off. You probably don't want to create so much regulatory risk that you scare off the hyperscalers from serving Chinese models; this will just drive startups to sketchier providers. There's a happy middle ground here. I'd assume they will do some version of this.

6. It's probably true that open-weight models of this capability make the world a bit more dangerous, but not so much more that you'll really notice. At some point the models will be capable enough that you will notice. "A nonliving, invisible, dangerous, and infinitely self-replicating agent escaped from a Chinese lab," you say? Color me shocked.

[David Williams @d_comfe]

It will be interesting to see if the government with its massive bureaucracy can create a useful model the same way a company can. While great innovations are generally incubated in government labs, general usefulness is almost always developed by those with a profit incentive.

[Andrew Curran @AndrewCurran_]

The White House has launched a program called 'Gold Eagle' which will give them more control over American frontier AI releases, and will require explicit government approval over which companies are granted access to new models. Voluntary participation may be coming to an end.

[David Williams @d_comfe]

It’s going to be a huge market serving open models. Prices will fall. Customers will succeed. And innovation will flourish. The more regulations are written, it seems, the more this system flourishes. What irony.

[David Sacks @DavidSacks]

OH: “i’ve switched to Kimi from claude for a bunch of work. it’s just so much more fun because it just does the thing instead of lecturing you”

Woke lobotomized models are the enemy of American competitiveness.

[David Williams @d_comfe]

It’s happening.

https://t.co/svViXPM6qo

[David Williams @d_comfe]

Claude re-released a model they still call Fable but which is measurably, significantly downgraded compared to v1 capabilities. And they're charging the same price.🤥 Prediction: Access to foreign frontier ai without nanny security will enable many valuable business models.

[David Williams @d_comfe]

Where do I sign up?

[Dino Mavrookas @MavrookasD]

Today we take the next step in bringing American shipbuilding back.

The future home of Port Alpha. Brownsville, Texas.

For decades, America walked away from the industrial base that once made us the greatest shipbuilder in the world. We handed that lead to others. Rebuilding it won't be easy. It takes real investment, and the guts to throw out the old playbook and build ships a completely different way. That's the whole point of Port Alpha.

We're building a shipyard that doesn't exist anywhere in the world today. Advanced manufacturing, software defined production, and autonomy, at a scale nobody's attempted. This is how we win it back.

We spent a year searching the entire country before we landed on Brownsville. Thank you to @GregAbbott_TX , the State of Texas, Cameron County, the Port of Brownsville, and the whole Brownsville community for going all in with us. There wasn't a better location or a more supportive government to partner with to turn this generational project into a reality, and fast! We'll break ground in '26 and be operational by '28 because that is what our Country needs. Where else is that possible?

And huge shoutout to our team. The people who show up every single day to build the products that are reshaping the entire maritime industry and changing the world.

Let's Build!

[David Williams @d_comfe]

Don’t worry. Most people won’t bother trying to read anyway.

[Andrej Karpathy @karpathy]

@btaylor It's not just em dashes, it's that many other legitimate &amp; useful language constructs are suddenly and somewhat arbitrarily super awkw and cringe

[David Williams @d_comfe]

Still deciding if the latest VC money wave isn’t just government funded reshoring billed as tech innovation. Opinions welcome.

[Salar al Khafaji @salar]

Today, we’re announcing an oversubscribed $32 million round at @BuildMonumental led by @khoslaventures, with participation from @pluralplatform and @HummingbirdVC.

[David Williams @d_comfe]

A tip to accelerate your work—organize your spare compute (Mac mini’s, gpu nodes, old laptops, etc) into a ray cluster and set up unique environments for subagents to run open models. Use frontier models to guide. Costs dropping. Productivity rising. The 🇺🇸 way.

[David Williams @d_comfe]

A return to the gold standard…sort of?

[Treasury Secretary Scott Bessent @SecScottBessent]

As America commemorates 250 years of independence, the @usmint will begin striking this new $1 gold coin to honor the enduring legacy of liberty and a lasting symbol of patriotism. Featuring President Trump, it celebrates the strength of American values, and the promise of a nation dedicated to preserving freedom for all.