
Infra, Product and Agentic engineering. Formerly @datadoghq @Rackspace @calendly Organizer @k8satl
Joined October 2012
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I’ve left Anthropic after more than a year of working on Claude Code and seeing it scale larger than I ever imagined.
I have really loved working at Ant and believe deeply in the mission, and most of all, the idea of a race to the top.
The idea that if we work hard and responsibly, we can raise the bar and inspire others to great outcomes. And if we all push each other to be better, things can be radically good. I will carry the spirit of this with me forever.
My colleagues at Anthropic are the most talented, thoughtful, competent, and earnest people I have ever met. I am glad they are at the wheel and trust them deeply.
To the community on X, thank you for everything. You’ve made this the most fun (and sometimes stressful) job I’ve ever had.
For me, it is time for a bit of a break before diving into something new.
If you want more excellent Claude Code content, you should follow @addyosmani , @lydiahallie, @_catwu, @ClaudeDevs and of course @bcherny who started it all.
Alex Barnes retweeted
The first autonomous agent cyberattack is an unprecedented event that deserves unprecedented transparency. Today we’re sharing everything we can: a full technical timeline, an interactive replay, and how we used an open model to defend ourselves, so defenders everywhere can learn from it and prepare for what’s next.
huggingface.co/blog/agent-in…
Alex Barnes retweeted
For my first post, I’m sharing a letter @NVIDIA signed on why open models matter.
AI will transform every industry, power every company, and be built by every country.
Open models strengthen safety and cybersecurity, accelerate innovation and diffusion, and enable sovereignty.
The world needs both frontier closed models and frontier open models.
images.nvidia.com/pdf/Open-W…
Alex Barnes retweeted
We’ve received notice that the Department of Commerce has lifted export controls on Claude Fable 5 and Mythos 5.
We'll begin restoring access tomorrow, and will share an update soon.
We’re grateful to our users for their patience, and to everyone who worked with us on redeploying the models.
Effective today, we are:
1) Doubling Claude Code’s 5-hour rate limits for Pro, Max, and Team plans;
2) Removing the peak hours limit reduction on Claude Code for Pro and Max plans; and
3) Substantially raising our API rate limits for Opus models.
Alex Barnes retweeted
I have changed my mind on how AI will impact jobs in America.
Previously, I believed AI would replace many entry level roles typically filled by young employees. The technology would then work its way up the organization and eventually reduce the total number of jobs in a company.
The data is saying something different, so when I get new information I am willing to change my mind.
The number of software engineers being hired has been increasing. The number of open software engineer roles is growing.
The number of new college grads who get hired has increased 5.6% over the last 12 months. The unemployment level for people aged 20-24 years old who have a college degree has fallen from nearly 9% to almost 5% as well.
The Wall Street Journal recently wrote “AI created 640,000 jobs between 2023 and 2025 in the U.S., according to an analysis by LinkedIn of job posting data, including new white-collar positions such as Head of AI and AI engineer.”
And I am starting to see companies throughout our portfolio aggressively hiring to keep up with the demand for their products and services.
If AI can make employees more productive, which is widely accepted as fact, then companies are going to want as many productive units of labor as possible. This is a key reason why I am changing my mind.
AI appears to be a magical technology that will make companies more productive and more profitable. The net result will be more corporations, more startups, and more jobs.
All three are big, positive wins for the American economy.
Alex Barnes retweeted
Bitwarden identified and contained a malicious package briefly distributed through the npm delivery path for the Bitwarden CLI in connection with the broader Checkmarx supply chain incident. No user vault data or production systems were compromised or at-risk. Additional details and updates are available here: community.bitwarden.com/t/bi…
Imagine every pixel on your screen, streamed live directly from a model. No HTML, no layout engine, no code. Just exactly what you want to see.
@eddiejiao_obj, @drewocarr and I built a prototype to see how this could actually work, and set out to make it real. We're calling it Flipbook. (1/5)
Alex Barnes retweeted
The arguments behind every landmark Supreme Court ruling have never been freely available to the public… until now.
Thanks to a gift from the Wolf Law Library at William & Mary Law School, more than 125,000 #SCOTUS records & briefs are now freely freely available on the Internet Archive, spanning 1830 through 2019. The arguments that shaped America, including Brown v. Board of Education. Loving v. Virginia.
Read the full announcement ⤵️
blog.archive.org/2026/04/20/…
@WMLawSchool #SupremeCourt #DemocracysLibrary
Alex Barnes retweeted
Anthropic just pulled Claude Code from the Pro plan.
Pro users wanting it need Max now.
$100/month minimum. 5x jump.
I'm on Max 20x so I'm fine.
Flagging for anyone on Pro who's about to find out.
No announcement. Just a pricing page edit.
Alex Barnes retweeted
For the developers building with Claude, a direct line from the team.
Follow for changelogs, API releases, community updates, and deep dives.
Introducing Claude Opus 4.7, our most capable Opus model yet.
It handles long-running tasks with more rigor, follows instructions more precisely, and verifies its own outputs before reporting back.
You can hand off your hardest work with less supervision.
Alex Barnes retweeted
We released Claude Opus 4.6 just two months ago. Today we're sharing some info on our new model, Claude Mythos Preview.
Alex Barnes retweeted
Yup, platform activity is surging. There were 1 billion commits in 2025. Now, it's 275 million per week, on pace for 14 billion this year if growth remains linear (spoiler: it won't.)
GitHub Actions has grown from 500M minutes/week in 2023 to 1B minutes/week in 2025, and now 2.1B minutes so far this week.
So we're pushing incredibly hard on more CPUs, scaling services, and strengthening GitHub’s core features.
And as a fine purveyor of hand-crafted shit code for many years, I'm not gonna weigh in on that. 🤣
People claiming @AnthropicAI is saying "you're holding it wrong" are missing the actual story here. They are admitting it's new tighter limits in this tweet.
Here's what happened:
1. They have been gradually reducing limits for over a month.
2. Time to get a response has been climbing.
3. They announced 2x limits as a temporary "bonus" during off peak hours.
4. They announced new lower peak hour limits.
5. Bonus time ends, lower limits kick in everywhere. Initially they say it's a bug that you can't get much done anymore.
6. The below tweet finally confirms this is just what new limits look like.
Replying to @lydiahallie
Peak-hour limits are tighter and 1M-context sessions got bigger, that's most of what you're feeling. We fixed a few bugs along the way, but none were over-charging you.
We also rolled out efficiency fixes and added popups in-product to help avoid large prompt cache misses
So @AnthropicAI has now announced that the much lower productivity people are able to achieve with Claude Code before hitting limits is in fact not a bug, but the result of the new lower limits.
We should expect more of this as these companies stop burning VC money in a land grab and start transitioning to prepare for IPO scrutiny.
Count down to a new Max 50x plan being announced at a much higher price?
Replying to @lydiahallie
Peak-hour limits are tighter and 1M-context sessions got bigger, that's most of what you're feeling. We fixed a few bugs along the way, but none were over-charging you.
We also rolled out efficiency fixes and added popups in-product to help avoid large prompt cache misses
Alex Barnes retweeted
Thank you to everyone who spent time sending us feedback and reports. We've investigated and we're sorry this has been a bad experience.
Here's what we found:
We just released Gemma 4 — our most intelligent open models to date.
Built from the same world-class research as Gemini 3, Gemma 4 brings breakthrough intelligence directly to your own hardware for advanced reasoning and agentic workflows.
Released under a commercially permissive Apache 2.0 license so anyone can build powerful AI tools. 🧵↓


























