Jason D. Clinton 🔸

We invited Claude users to share how they use AI, what they dream it could make possible, and what they fear it might do. Nearly 81,000 people responded in one week—the largest qualitative study of its kind. Read more: anthropic.com/features/81k-i…

The open source ecosystem underpins nearly every software system in the world. As AI grows more capable, open source security becomes increasingly important. We're donating to the Linux Foundation to continue to help secure the foundations AI runs on.

Open source powers critical infrastructure. Much of it is maintained by small teams. Today, Anthropic joined AWS, GitHub, Google, Google DeepMind, Microsoft, and OpenAI in committing $12.5M to Alpha-Omega and OpenSSF to fund resources maintainers need. linuxfoundation.org/press/linux-fo…

@Tharin_P @TIME Thank you for writing about this!

@JasonDClinton I think it's also a very useful frame for people to understand / make predictions about AI behavior - I recently covered the model and some of its implications in a piece for @TIME share.google/qCkfSxXLfQmvpE…

In my opinion, Persona Selection Model is one of the greatest research findings in AI in the last year but it didn't get much attention because of the news over the last few weeks. This has profound implications for safety, security, and moral considerations.

@joshua__hone so many implications!

@JasonDClinton underrated for sure

@Lang__Leon all ideas are derivative

@JasonDClinton This is not a research finding of the past year, there are many precursors like: lesswrong.com/posts/vJFdjigz…

My ancestors buried half their children. All mine are alive. My ancestors' house had a dirt floor. Mine is wood. I have indoor plumbing, I have hot water, I have never in my life hauled a full bucket half a mile and I probably never will. Do you know how rare it is, in human history, for small children to wear shoes? Mine have multiple pairs. I can speak to my relatives who live thousands of miles away, for free, at any time. Video, if we want video. With machine translation, if we speak different languages. The original Library of Congress had 740 books in it. I have more than that. If I run out of books in my home my local public library has 350,000. If I want to take a hundred books with me on vacation, they all fit on a device that fits in my purse. I have heat in the winter and AC in the summer and a washing machine and I have never, ever, ever had to scrub a dress clean by hand in the stream. I can look up recipes from more than a hundred different countries and I've tried dozens of them. I ride a clean and modern train across my city for $4, or take a robot taxi if I'm out too late for the train. I donate $40,000 every year to the cause of getting healthcare to the world's poorest people and even after the donations I never have to think about whether I can afford a book, or a pair of shoes, or a cup of coffee. There is a great deal more to fight for, of course. I hope that our descendants will look back on our lives and list a thousand ways they're richer. Maybe we ourselves will do that, if some of the crazier stuff comes true. But the abundance is all around you and to a significant degree you aren't feeling it only because fish don't notice water.

@JacquesThibs we believe in the mission and focus exclusively on it

You gotta admire Dario’s no side-quests focus at Anthropic vs other companies. I wonder how much of it comes naturally.

There's been a lot of buzz around Claude's 30K word constitution ("soul doc") and unusual ways Anthropic is integrating it into training. If we can robustly train complex values into a model, that's a big deal for safety. But does it actually work? Yes, surprisingly well!

@RobertJBye @simonw Did you enable HEIF format images in the Camera advanced settings?

@simonw Oh strange, will look into this!

New updates are rolling out to the Claude mobile apps today! The team have shipped improvements to voice mode, transcription, LaTeX rendering, artifact display, large prompts perf, MCP connections, attachment uploads, and much more. Please keep sharing feedback!

1/n Today we're releasing the first public draft of the Security Level 5 (SL5) standard, designed to protect frontier AI models against nation-state adversaries. This v0.1 focuses on long lead time interventions: the things that need to start now, before SL5 is urgently needed. standard.sl5.org

We made a blind taste test to see whether NYT readers prefer human writing or AI writing. 86,000 people have taken it so far, and the results are fascinating. Overall, 54% of quiz-takers prefer AI. A real moment! nytimes.com/interactive/20…

I get yelled at for saying this but for many hundreds of years people went to university not to get diplomas or be employable but because immersion in the humanities was considered foundational to a good life, and school must return to its original purpose: the joy of learning.

@RobotPoet54 Haven't looked at the paper but our empirical approach of using training to reduce hallucinations, so far, has been extremely effective.

arxiv.org/abs/2512.01797 @JasonDClinton would really be interested in how Anthropic is considering this paper.

AIs being able to discover CVEs this easily might mean I finally move off of Arc Looking at the software I use today and realizing it's more important more than ever to be on well tested up to date apps

Introducing the Claude Marketplace, a way for enterprises to simplify their procurement of AI tools. Now in limited preview.

We partnered with Mozilla to test Claude's ability to find security vulnerabilities in Firefox. Opus 4.6 found 22 vulnerabilities in just two weeks. Of these, 14 were high-severity, representing a fifth of all high-severity bugs Mozilla remediated in 2025.

@emollick apologies. we are suffering from unprecedented inbound interest. we will fix this and the documentation issue. thank you for the feedback

The flip side of this is that I have spoken to numerous Fortune 500 companies that can't figure out how to get anyone senior on the phone from OpenAI or Anthropic or Google to actually make a deal for enterprise access. Calls & emails not returned, or only junior people available