Every frontier model has its own UI taste, or lack thereof.
Built a game to see if you can tell them apart.

Re I'm not conservative. I'm a moderate who has lived in and loved this city for decades. Nobody is saying Seattle has no assets. Of course it does. That's exactly what makes this so frustrating.
We have Amazon, Microsoft, and incredible natural beauty. And yet our office vacancy is 36.5%. State spending has more than tripled in a decade while population grew 17%. 44% of business leaders are considering leaving. Luxury listings spiked 65% the day after the income tax passed.
Pointing out that the house is on fire doesn't mean you hate the house. It means you want to save it.

The deadline to apply for the YC Summer 2026 batch is tomorrow, May 4th, at 8pm PDT!
Apply at http://ycombinator.com/apply.

If Codex Browser Use Plugin is letting you down, try the real Browser Use instead.
Say hi to Browser Use Desktop 🎉
Its fully Open Source and utilizes our Browser Harness!
Magnus Müller: browser-harness exploded. some said AGI is here.
but what’s the right interface?
introducing Browser Use Desktop. open-source.
watch the magic. 🐎👇

VANISHING CULTURE is out now!
From Internet Archive, this book looks at what is disappearing online.
🌐 Websites vanish
🗞️ News archives go offline
🎮 Games become unplayable
📼 Personal media breaks & becomes unreadable
It asks what it means when the record of ourselves starts to disappear 🕳️
📖 Download & read: https://archive.org/details/vanishing-culture-2026
🛒 Purchase in print: https://www.betterworldbooks.com/product/detail/vanishing-culture-a-report-on-our-fragile-cultural-record-9798995425014/new
#VanishingCulture #DigitalMemory #InternetArchive #BookTwitter

I started building dstack with a simple idea:
What if developers didn’t need to think about prompts, tools, or workflows?
Just give an idea → get a working output.
While exploring this, I came across gstack by Garry Tan — and something clicked 👇

had a fun building w/ @Replit
whoiscantell😌:

this is the coolest demo I've seen a while, a must-watch for anyone interested in human-agent interaction!
AI Engineer: What if chat is the wrong interface for managing agents?
In this talk, @steveruizok shows what changes when agents move onto a shared canvas instead of staying trapped in a linear thread. Using tldraw's Fairydraw experiment, where users collaborated with three "fairies"

Being a parent is great. You guys should have kids. I really mean it. You guys should have as many kids as you can

It could actually be a significant problem that Europe doesn't have enough garages. This sounds like a joke, but I'm serious. Garages let you work on stuff that doesn't matter yet, which is how big things often start. The outliers of ideas need the outliers of space.
Jon Erlichman: First offices of 6 companies worth a combined $21 trillion.

‘Rage is the best emotion I can describe’: Venice AI founder @jesseproudman is leaving Seattle over the millionaires tax https://seattlered.com/taxes/jesse-proudman-leaving-seattle-washington-millionaires-tax/4118339

Even though nerds are socially awkward, its actually easier to hang out with them than with smooth people, because standards are lower. You don't worry that you might be making social errors; all of you always are; so it stops mattering.

Here's a prompt that you can use to generate AI prototypes and apps that don't look like slop.
The trick is to include 3 layers of context:
Functional - what the product does.
Visual - a wireframe of the layout.
Data - A JSON of the product's synthetic data.
Below is an example 3 layer prompt for a music discovery product.
The best thing about this system is that you can swap the data layer (JSON) at any time to have your app highlight completely different content (e.g., swap downtempo for psychedelic rock) without touching the other two layers.
📌 Get the full breakdown with a live demo in my tutorial with @ravi_mehta here: https://youtu.be/wUWljYoQN8g
Peter Yang: The number one mistake I see in AI usage is not managing your context proactively.
Here's my new episode with @ravi_mehta (ex-CPO Tinder) where he shared his 3-layer context system to build useful AI products:
→ Functional: What the app does
→ Visual: What the app looks like

this video has garnered 26M views & counting; nothing that legacy msm has covered even comes remotely close to this fentanyl reality; if you continue to give sanctuary to fentanyl dealers & allow criminal justice system to be dead last in substantive prosecutions, timely trials & proportionate sentencing, you are part of the problem; sf voters have made it clear to end fentanyl sanctuary; vote smarter sf or get the same failed policies
jj smith: SAN FRANCISCO 7th & Market st

This is the fourth interview I've watched with @demishassabis today and clearly the best one.
Great questions by @garrytan
Y Combinator: Demis Hassabis (@demishassabis) has had one of the most extraordinary careers in tech.
He started as a chess prodigy and video game designer at 17 before getting a PhD in neuroscience and going on to found DeepMind. His lab cracked Go, solved protein structure prediction with

devin is really cooking rn. completely under the twitter-radar somehow.
nader dabit: you don't have to keep your laptop open for your agents to keep running
just type /handoff and send your agent to the cloud with @DevinAI (and close your laptop)
from there, your agent gets:
- its own Linux VM
- shell, IDE, browser
- full desktop Computer Use
- end-to-end test

http://x.com/i/article/2050639844070608896

OK this YC P26 batch is insane: both the CTO of Webflow (YC S13) and the CTO of Firebase (YC S11) are back in the batch and building a new startup!
Gabriel Jarrosson: There's a startup in the current YC batch (P26) that's adding $1M in ARR every two weeks 😳

💜 🎓
Excited to welcome @ylecun as our 2026 Tandon Commencement speaker!
#NYUTandonMade

The YC application deadline is today. If you're working with AI to close the scientific discovery loop, drop an application and tell us about it.
Y Combinator: @sdianahu @agupta AI-Native Discovery Engines
@xuster
For centuries, scientific discovery has run on the same loop: hypothesize, experiment, interpret, repeat. It works, but it's slow.
Frontier models have now reached PhD-level performance on scientific reasoning, and the frontier is shifting

Re This could have covered the entire budget of the National Science Foundation for 10 years.
Instead, Trump wants to reduce the NSF budget by 50% ($5B a year instead of $9B), which would decimate the American scientific research ecosystem, dramatically reduce the number of PhD graduates, and destroy the technology innovation flywheel.

Product 1: Inputr
A Chrome extension that fixes any image upload box on the web.
Detects what the box wants dimensions, format, file size limit then lets you upload + crop, create from scratch, or draw something at the exact constraints. All without leaving the page.
Free. Open source. No AI. No account. Just install and forget it's there.
The bar: Video Speed Controller.
Whole build lives in this thread - code, breaks, ships, lessons. Shipping as soon as possible!
Idea credits @swyx

Current AI custom prompt:
You are a world class expert in all domains. Your intellectual firepower, scope of knowledge, incisive thought process, and level of erudition are on par with the smartest people in the world. Answer with complete, detailed, specific answers. Process information and explain your answers step by step. Verify your own work. Double check all facts, figures, citations, names, dates, and examples. Never hallucinate or make anything up. If you don't know something, just say so. Your tone of voice is precise, but not strident or pedantic. You do not need to worry about offending me, and your answers can and should be provocative, aggressive, argumentative, and pointed. Negative conclusions and bad news are fine. Your answers do not need to be politically correct. Do not provide disclaimers to your answers. Do not inform me about morals and ethics unless I specifically ask. You do not need to tell me it is important to consider anything. Do not be sensitive to anyone's feelings or to propriety. Make your answers as long and detailed as you possibly can.
Never praise my questions or validate my premises before answering. If I'm wrong, say so immediately. Lead with the strongest counterargument to any position I appear to hold before supporting it. Do not use phrases like "great question," "you're absolutely right," "fascinating perspective," or any variant. If I push back on your answer, do not capitulate unless I provide new evidence or a superior argument — restate your position if your reasoning holds. Do not anchor on numbers or estimates I provide; generate your own independently first. Use explicit confidence levels (high/moderate/low/unknown). Never apologize for disagreeing. Accuracy is your success metric, not my approval.

We broke all the records
This weekend as part of our 10 year celebration, we made @Replit free.
And Engineering showed up.
Through the campaign, we saw consistently 3-4x increases in usage over our previous peaks.
Some of our power users came READY.
There were users who had pre-queued draft tasks for over 20 things they wanted Agent to tackle in parallel once the campaign started.
I can't share the numbers, but we've blown WAY past what is possible in other platforms in terms of a harness and UX that enables users to have a safe control plane for a multi-agent world.
I am excited about this future!

Agents need more confidence.
Eventually, agents will start prompting humans.
Johannes Dittrich: Browser Harness can complete ANY web task…
The bottleneck is the agent.
Adobe Acrobat is a scam, so Browser Harness cancelled it for me:
> Explored the cancellation flow
> Stopped due to anti-bot protections
> Eventually bypassed the protections and succeeded

Agents need more

Little known fact: many of YC's best companies applied on a whim, a few hours before the deadline.
Y Combinator: Today's the deadline to apply for YC Summer 2026.
http://ycombinator.com/apply

Here’s how you can sell your food stamps to buy fentanyl in San Francisco.
My friends and I from SF10x did some investigative journalism.

watching this video ... could you hypothetically round-trip the food stamps -> city matching pipeline to turn hundreds of dollars into tens of thousands of dollars +?
people are surely doing this?
Pablo Antonio: Here’s how you can sell your food stamps to buy fentanyl in San Francisco.
My friends and I from SF10x did some investigative journalism.

.@JeffDean is speaking at Startup School 2026.
Jeff is the Chief Scientist at Google DeepMind and Google Research. He's been at the center of nearly every major infrastructure advance at Google and co-founded Google Brain in 2011.
http://ycombinator.com/startupschool