Ethan
@ethanrosenthal.com
data/ml/ai @ runway in 🗽
formerly spent time in startups, biggish tech, and physics labs
www.ethanrosenthal.com
formerly spent time in startups, biggish tech, and physics labs
www.ethanrosenthal.com
February 9, 2026 at 2:32 PM
Reposted by Ethan
just found out claude code has `/insights` aka claude code wrapped
it produces an html page with details about your usage and suggestions for using the tool more effectively
extremely interesting
it produces an html page with details about your usage and suggestions for using the tool more effectively
extremely interesting
February 4, 2026 at 6:58 PM
just found out claude code has `/insights` aka claude code wrapped
it produces an html page with details about your usage and suggestions for using the tool more effectively
extremely interesting
it produces an html page with details about your usage and suggestions for using the tool more effectively
extremely interesting
Reposted by Ethan
Well, this is great; I look forward to the coming wave of private equity firms buying up preschools. arxiv.org/abs/2601.20123
Optimal illness policy for an unethical daycare center
While businesses are typically more profitable if their workers and communities are minimally exposed to diseases, the same is not true for daycare centers. Here it is shown that a daycare center coul...
arxiv.org
January 29, 2026 at 10:57 AM
Well, this is great; I look forward to the coming wave of private equity firms buying up preschools. arxiv.org/abs/2601.20123
A rare dose of optimism for me recently (related to the climate no less!) has been listening to the @volts.wtf podcast.
I read Electrify a couple years ago, and the podcast reveals how that thesis has been playing out since the book was published. And it turns out things are moving along!
I read Electrify a couple years ago, and the podcast reveals how that thesis has been playing out since the book was published. And it turns out things are moving along!
January 29, 2026 at 12:54 AM
A rare dose of optimism for me recently (related to the climate no less!) has been listening to the @volts.wtf podcast.
I read Electrify a couple years ago, and the podcast reveals how that thesis has been playing out since the book was published. And it turns out things are moving along!
I read Electrify a couple years ago, and the podcast reveals how that thesis has been playing out since the book was published. And it turns out things are moving along!
Pour one out for anyone doing a walk of shame this morning
January 24, 2026 at 1:34 PM
Pour one out for anyone doing a walk of shame this morning
Reposted by Ethan
The "This is the most fun I've had..." sentiment follows my experience as well.
I'll add: it's the most powerful computers have felt to me since I first learned to code. Now it's easier than ever to make them do what I want them to.
I'll add: it's the most powerful computers have felt to me since I first learned to code. Now it's easier than ever to make them do what I want them to.
After making dozens of prototypes with AI coding agents, here's what I think: human developers are still essential
In fact, instead of taking jobs, this new class of software tools may make workers busier than ever. I wrote about my experience for Ars Technica:
arstechnica.com/information-...
In fact, instead of taking jobs, this new class of software tools may make workers busier than ever. I wrote about my experience for Ars Technica:
arstechnica.com/information-...
10 things I learned from burning myself out with AI coding agents
Opinion: As software power tools, AI agents may make people busier than ever before.
arstechnica.com
January 19, 2026 at 2:54 PM
The "This is the most fun I've had..." sentiment follows my experience as well.
I'll add: it's the most powerful computers have felt to me since I first learned to code. Now it's easier than ever to make them do what I want them to.
I'll add: it's the most powerful computers have felt to me since I first learned to code. Now it's easier than ever to make them do what I want them to.
I wonder how many people are in the world now? Oh wow, 8.3B. I remember when it was like 6 something. I wonder how old the universe is now? Oh ok, still 13.8B years old.
January 18, 2026 at 4:41 PM
I wonder how many people are in the world now? Oh wow, 8.3B. I remember when it was like 6 something. I wonder how old the universe is now? Oh ok, still 13.8B years old.
Yes, training foundation models is a gold rush, but nobody tells you how much fun the work actually is. Just a lovely mix of research, systems, and scale, from training to inference.
January 18, 2026 at 12:31 PM
Yes, training foundation models is a gold rush, but nobody tells you how much fun the work actually is. Just a lovely mix of research, systems, and scale, from training to inference.
Yeesh what a week to finally watch one battle after another
January 17, 2026 at 3:44 PM
Yeesh what a week to finally watch one battle after another
On the bright side, nobody’s gonna complain that you’re spending too much time writing tests nowadays
January 16, 2026 at 3:02 AM
On the bright side, nobody’s gonna complain that you’re spending too much time writing tests nowadays
When the web search is personalized but the image search is not
January 15, 2026 at 4:11 PM
When the web search is personalized but the image search is not
Reposted by Ethan
Excited to present a new preprint with @nkgarg.bsky.social: presenting usage statistics and observational findings from Paper Skygest in the first six months of deployment! 🎉📜
arxiv.org/abs/2601.04253
arxiv.org/abs/2601.04253
January 14, 2026 at 7:48 PM
Excited to present a new preprint with @nkgarg.bsky.social: presenting usage statistics and observational findings from Paper Skygest in the first six months of deployment! 🎉📜
arxiv.org/abs/2601.04253
arxiv.org/abs/2601.04253
I bet holidays are really good for the AI companies. People finally have time to try out their products and then get hooked.
January 12, 2026 at 11:50 AM
I bet holidays are really good for the AI companies. People finally have time to try out their products and then get hooked.
I've never used Cursor, but I use Claude Code a lot. We'll see how this one pans out...
A timeline of my top picks:
2014: Python over R
2017: PyTorch over Tensorflow
2023: Bluesky over Twitter, Mastodon, and Threads
I don’t miss.
2014: Python over R
2017: PyTorch over Tensorflow
2023: Bluesky over Twitter, Mastodon, and Threads
I don’t miss.
January 7, 2026 at 2:25 PM
I've never used Cursor, but I use Claude Code a lot. We'll see how this one pans out...
Reposted by Ethan
This is supposedly the benefit of the LSP integration but it’s currently broken in CC:
github.com/anthropics/c...
github.com/anthropics/c...
[BUG] LSP plugin system not connecting to language servers - always returns "No LSP server available" · Issue #15168 · anthropics/claude-code
Preflight Checklist I have searched existing issues and this hasn't been reported yet This is a single bug report (please file separate reports for different bugs) I am using the latest version of ...
github.com
January 7, 2026 at 2:12 PM
This is supposedly the benefit of the LSP integration but it’s currently broken in CC:
github.com/anthropics/c...
github.com/anthropics/c...
Should agents be able to use a debugger? Claude Code is like me and loves to print instead. Should they be able to command-click to the function definition like I do in an IDE, rather than grepping files?
January 7, 2026 at 12:34 PM
Should agents be able to use a debugger? Claude Code is like me and loves to print instead. Should they be able to command-click to the function definition like I do in an IDE, rather than grepping files?
Kids these days don’t understand the difficulty of being an adult in the early 2010s, winding your headphone cord from your ears down under your scarf, inside your peacoat, and into the audio jack of your iPod touch.
January 6, 2026 at 11:00 PM
Kids these days don’t understand the difficulty of being an adult in the early 2010s, winding your headphone cord from your ears down under your scarf, inside your peacoat, and into the audio jack of your iPod touch.
2026 gonna be like
Interviewer: Tell me about a time that you and Claude Code disagreed.
Me: I asked Claude to create a custom serializer. When it showed me its implementation—
Interviewer: Excuse me, it sounds like you weren’t in YOLO mode? I’m sorry, but this role won’t be a good fit.
Interviewer: Tell me about a time that you and Claude Code disagreed.
Me: I asked Claude to create a custom serializer. When it showed me its implementation—
Interviewer: Excuse me, it sounds like you weren’t in YOLO mode? I’m sorry, but this role won’t be a good fit.
January 6, 2026 at 6:13 PM
2026 gonna be like
Interviewer: Tell me about a time that you and Claude Code disagreed.
Me: I asked Claude to create a custom serializer. When it showed me its implementation—
Interviewer: Excuse me, it sounds like you weren’t in YOLO mode? I’m sorry, but this role won’t be a good fit.
Interviewer: Tell me about a time that you and Claude Code disagreed.
Me: I asked Claude to create a custom serializer. When it showed me its implementation—
Interviewer: Excuse me, it sounds like you weren’t in YOLO mode? I’m sorry, but this role won’t be a good fit.
Got rid of a bunch of my old physics textbooks, which allowed us to get rid of the bookshelf, which created space for my drumset.
My life is a perennial partitioning of space and time to make room for activities.
My life is a perennial partitioning of space and time to make room for activities.
January 4, 2026 at 5:57 PM
Got rid of a bunch of my old physics textbooks, which allowed us to get rid of the bookshelf, which created space for my drumset.
My life is a perennial partitioning of space and time to make room for activities.
My life is a perennial partitioning of space and time to make room for activities.
Reposted by Ethan
January 4, 2026 at 11:33 AM
I wonder if universities moving to oral exams, due to the modern futility of assigning writing assignments, will improve students’ interviewing abilities
January 1, 2026 at 9:13 PM
I wonder if universities moving to oral exams, due to the modern futility of assigning writing assignments, will improve students’ interviewing abilities
Nice idea by @tdhopper.com at the end of the post to use voice-to-text with Claude code. I sometimes find myself dragging my feet about using Claude code since I don’t feel like typing out everything to explain what I want.
tdhopper.com/blog/how-im-...
tdhopper.com/blog/how-im-...
How I'm Using AI at the End of 2025
A look at how I'm using various AI tools for chat, image generation, code, writing, and learning.
tdhopper.com
January 1, 2026 at 9:08 PM
Nice idea by @tdhopper.com at the end of the post to use voice-to-text with Claude code. I sometimes find myself dragging my feet about using Claude code since I don’t feel like typing out everything to explain what I want.
tdhopper.com/blog/how-im-...
tdhopper.com/blog/how-im-...
Reposted by Ethan
I wrote a short essay on what I'm calling the AI Attribution Error. doi.org/10.59350/c3g...
December 28, 2025 at 12:43 PM
I wrote a short essay on what I'm calling the AI Attribution Error. doi.org/10.59350/c3g...