How do I make Codex the default tab when I open the ChatGPT app
Elon Musk
Grok Imagine on Vercel
Vercel Developers: Grok Imagine Video 1.5 on AI Gateway.
Image-to-video generation with synced audio in one pass.
𝚊𝚠𝚊𝚒𝚝 𝚐𝚎𝚗𝚎𝚛𝚊𝚝𝚎𝚅𝚒𝚍𝚎𝚘({
𝚖𝚘𝚍𝚎𝚕: '𝚡𝚊𝚒/𝚐𝚛𝚘𝚔-𝚒𝚖𝚊𝚐𝚒𝚗𝚎-𝚟𝚒𝚍𝚎𝚘-𝟷.𝟻-𝚙𝚛𝚎𝚟𝚒𝚎𝚠',
𝚙𝚛𝚘𝚖𝚙𝚝: '𝚊 𝚛𝚊𝚋𝚋𝚒𝚝 𝚜𝚙𝚛𝚒𝚗𝚝𝚒𝚗𝚐
Grok Imagine Video on @vercel AI Gateway – the top image-to-video model on http://arena.ai
Vercel Developers: Grok Imagine Video 1.5 on AI Gateway.
Image-to-video generation with synced audio in one pass.
𝚊𝚠𝚊𝚒𝚝 𝚐𝚎𝚗𝚎𝚛𝚊𝚝𝚎𝚅𝚒𝚍𝚎𝚘({
𝚖𝚘𝚍𝚎𝚕: '𝚡𝚊𝚒/𝚐𝚛𝚘𝚔-𝚒𝚖𝚊𝚐𝚒𝚗𝚎-𝚟𝚒𝚍𝚎𝚘-𝟷.𝟻-𝚙𝚛𝚎𝚟𝚒𝚎𝚠',
𝚙𝚛𝚘𝚖𝚙𝚝: '𝚊 𝚛𝚊𝚋𝚋𝚒𝚝 𝚜𝚙𝚛𝚒𝚗𝚝𝚒𝚗𝚐
App to App Store in 48 hours!
Deirdre Sommerkamp: When @Replit said I could publish an app on the Apple app store, I was up for the adventure. Trust, but verify. 🤭
Submitted late last Friday night. Approved and in the app store 48 hours later. 🤯 and also 🥳
Core Values: Find Yours
https://apps.apple.com/us/app/core-values-find-yours/id6773931954
WHY CORE VALUES?
you guys know where this is going right
Hasan: wow this @reve 2.0 launch copy is supurb.
"it is now clear that the key to both controllable image generation and editing is not denser prompts, but a highly detailed, highly manipulatable, intermediate representation expressed as code."
"Creativity is not, and will never be,
Lee Edwards
Beyond parody.
Saikat spent $10M of his own tech money to get a fraction of votes necessary to make the runoff, but wants to blame AIPAC spending less than that for his embarrassing defeat.
You cannot fathom how blessed we are to not have this fucking guy in Congress.
sarah guo
1/ 🔥 @NoPriorsPod x @LatentSpacePod chat with @SatyaNadella at @Microsoft Build. He has the sharpest mental models of any public company CEO I've interviewed.
$MSFT is at its heart still a tools company! Big focus on agentic coding, harness & AI evals. Takeaways:👇
Jeff Lonsdale
Thank you Tom Steyer and Saikat Chakrabarti for demonstrating that rich people cannot actually buy elections, even when they cosplay as far left revolutionaries.
Raphaël Dabadie (YC P26)
There should be a book written about the history of YC, and it’d probably be a very long one @jesslivingston @paulg
Hearing all those stories make being part of YC even more special
Re @HamiltonMusical the most viral thing i have ever done and its a bootleg hamilton sitzprobe not anything ai related
Conference on Robot Learning
The CoRL 2026 keynote lineup is here!
🔹 Russ Tedrake — MIT; stealth startup @RussTedrake
🔹 Fei-Fei Li — Stanford; World Labs @drfeifei
🔹 Wolfram Burgard — UT Nuremberg @wolfram_burgard
Join us in Austin this November.
https://www.corl.org/program/keynotes
Lee Edwards
The clock cleanings will continue until candidates improve.
https://sfstandard.com/2026/06/03/san-francisco-progressives-election-defeat/
Elon Musk
Hadamard thought in image space
a16z: World Labs CEO Dr. Fei-Fei Li: "The world is not made of words."
"Language models have given machines an extraordinary command of concepts, vocabulary, and reasoning, but the physical world, virtual or real, runs on a different substrate."
"Where language models learn the
The Pelley Firing Is Not a Free-Press Tragedy. It’s an Autopsy.
https://garryslist.org/posts/the-pelley-firing-is-not-a-free-press-tragedy-it-s-an-autopsy
John Sjölander
This quote from @garrytan might be remembered in history as the most exact early description of the changing world, I can’t state that strongly enough:
“But the new game isn't played in lines of code at all.
When you can turn intent directly into working, tested, reusable systems, the bottleneck stops being how much you can build and starts being what you actually want and whether it's worth building. The scarce resource becomes clarity, taste, and judgment. The engineer who writes the least code is often the one building the most.”
Garry Tan: http://x.com/i/article/2061176923531984896
btw this kind of medieval total bullshit is why @tailwindcss completely won
Mike Levin
Trump’s budget director Russ Vought is the most dangerous person you’ve never heard of.
And he just proposed turning every federal grant into a loyalty test.
His plan would make funding for cancer research, housing, transportation, and public health depend on one thing: whether it “advances the President’s policy priorities.”
Not whether it works.
Not whether Congress authorized it.
Whether it pleases Trump.
This is the appropriations power. It belongs to Congress and to the people.
To my Republican colleagues: where are you?
Congress passed this funding. You voted for it.
Vought is telling you to your faces that your votes do not matter, that he and his enablers will override the law whenever it suits them. Every day you stay silent, you give away the institution you were elected to defend.
Grow a spine.
This is not about left or right.
It is about whether Congress still exists as a coequal branch, or whether we have quietly surrendered the purse to an unelected hack who holds the Constitution in contempt.
History will remember who stood up and who looked away.
https://www.nytimes.com/2026/06/02/us/politics/trump-budget-grants-omb-vought.html?unlocked_article_code=1.nFA.SxkF.CIeKNfpW176B&smid=nytcore-ios-share
Congrats Void team!
We @vercel reaffirm our collaboration on an open platform for the web, with our investment in @nitrojsdev, open runtimes, and native support for Vite-based frameworks like Nuxt, Svelte, and TanStack Start 🫡
VoidZero: VoidZero is joining Cloudflare.
Our mission stays the same: to make JavaScript developers more productive than ever before. Vite, Vitest, Rolldown, Oxc, and Vite+ remain MIT-licensed. Evan and the VoidZero team will continue leading them.
Cloudflare shares our commitment to
Yuri Sagalov
Immigrants founded 455 of 775 (59%!) of America’s privately held unicorns.
The collective value of those 455 unicorns is $5T, which is more than the
total market value of companies listed on stock markets in all but 7 countries, including the UK and Germany.🤯
It's pretty annoying that Codex uses agents.md and Claude Code uses Claude.md.
There should be some industry standards to this stuff?
It’s much easier to understand that when you have bad policies that will destroy California, are anti-prosperity, want to pull up the ladder after attaining tech wealth, nobody should vote for you
Saikat I hope enjoys being a private citizen because he is no public servant
Matthew Yglesias: Very funny to flop after spending $10 million on your campaign and then blame "the 7 million dollars of AI, Crypto, and AIPAC money that were put into this race" for your defeat.
Armand Domalewski
not only did @Scott_Wiener triumph, two Supervisors who voted for a city wide upzoning in districts historically seen as super NIMBY also won handily.
building housing is popular!
Matthew Yglesias: In my experience, a lot of elected officials who get the case for YIMBYism theoretically still worry that it’s bad politics.
I hope everyone takes note that @Scott_Wiener, probably the single best-known YIMBY champion around, just won his race handily.
Y Combinator
In the first episode of our new series Full Stack, @conductor_build CEO and co-founder @charlieholtz takes us into the details of how he sets up his workflow for coding and managing AI agents.
00:00 – Building Conductor With Conductor
01:05 – Managing a Team of Coding Agents
02:39 – Do You Still Write Code?
04:17 – Charlie's AI Stack and Setup
05:48 – “Slop-free” Zones
07:25 – Don’t Let the AI Be Your Architect
09:15 – The Future of Cloud Workspaces
10:40 – Claude vs Codex
12:01 – Tokenmaxxing
14:17 – The Future of Human–AI Collaboration
15:07 – "Code Is Becoming Sawdust"
wondering if @_catwu has an update on this chart post opus 4.8
Ankit Gupta
Oh nice this has been my #1 feature request great job
Daksh Gupta: introducing the greptile CLI.
a full greptile review for your local changes, right in your terminal.
1. npm i -g greptile
2. checkout your branch
3. greptile review 🦎
Samip
1/ Now that we're running out of data, how do you optimally scale multi-epoch pretraining to hundreds of epochs?
Our first paper from Q! q0 trains a population of models, instead of single model that saturates fast, reaching a dramatically lower loss at *every* epoch budget.
w/ @bishmdl76 @akshayvegesna @ShmuelBerman
Replit ⠕
Build Your Business Live https://x.com/i/broadcasts/1qGoNNngZkyKv
Liz Wessel
There are few people in the world I've met who are as dedicated, intense, and ambitious as @SurbhiSarnaSF. I had the honor of first getting to know Surbhi when we were both working at YC, and it was so obvious from my very first interaction that she was someone who would leave a massively impactful mark on the world. Then you have @nateps -- one of the smartest, kindest, and most genuine people out there -- who also happens to be an EPIC builder.
Put them together, and you get an unstoppable team.
I am so thrilled for the entire Collate crew on this huge financing milestone. I know Collate customers have been loving the platform, and I can't wait for so many more people to experience it soon. https://www.forbes.com/sites/innovationrx/2026/06/03/ai-startup-collate-raises-95-million-to-automate-life-sciences-paperwork/
AI Engineer
Skill issue: Lessons from skilling up coding agents
Getting agents to actually use Langfuse was a "skill issue" — literally. Marc Klingen from Clickhouse on teaching coding agents to use new tools, and why it's harder than you think.
https://www.youtube.com/watch?v=vNCY9kXXyDQ
Paul Graham
I've added a new question to the list I consider during office hours with YC startups. As well as "Can we induce network effects?" and "Would it make sense to go full-stack?" I now ask "Can we make this AI-proof?" Can we ensure this company still exists if AIs do most work?
We just published internal data on how much of Claude's development is already being done by Claude:
- Over 80% of all code merged into our codebase is now written by Claude
- It's been months since many researchers at Anthropic hand-wrote code
- The typical Anthropic engineer ships 8x as much code as they did in 2024
- On the most open-ended engineering tasks, Claude's success rate jumped from ~26% to 76% in 6 months
- When research sessions went off-track, Claude proposed a better next step than the human took 64% of the time
We're not at recursive self-improvement yet, but it could come sooner than most expect. I highly recommend reading the full blog post.
Anthropic: Our internal data shows Claude is accelerating AI development—a possible path to recursive self-improvement, or AI autonomously building a more capable successor.
It’s happening faster than we thought, and the implications deserve greater attention. https://www.anthropic.com/institute/recursive-self-improvement
Founders Fund
MAFIA EP 001
I am interviewing the legend @mvanhorn tomorrow and I'm going to ask him to demo some of these hacks live + his favorite Printing Press integrations.
What else should I ask him? Let us know in the replies.
Also if you want the interview soon, subscribe here: https://www.youtube.com/@PeterYangYT?subscribe
Matt Van Horn: http://x.com/i/article/2061440101411102721
its been such fun befriending Pari and seeing him completely reinvent his company for the agentic era, WHILE having the most insanely stacked customer base I've ever seen in the hardest engineering domain of all.
Pari is creating a category that is only obvious in retrospect (the best kind of obvious) after you've had to build any complex physical things from rockets to cars, managing thousands of tiny design and supply chain details any one of which can derail your entire year.
what value do you put on that?
Pari Singh: Agents have reached hardware.
We are launching Flow v3, the Agentic Platform for Physical Engineering.
We've spent over a year building it in secret, alongside the best hardware companies and AI research labs.
An agent can now do real engineering work: change a requirement,
Harj Taggar
The best hires are the ones you can delegate outcomes to, not tasks. Good hires come back with smart questions about the next step. Great ones just get the job done.
Alex Salsali
About @ycombinator:
"Y Combinator does more than it looks. YC takes concentrated resources and hands them out in small amounts to people who will go and build. The genius of it is not the hoarding. It is the directing. A bin that only ever gets deeper is dead weight. A bin that flows outward to the right hands becomes a hundred other things."
Way more than just building what people want. @garrytan @paulg
Aaron Epstein
First time I've seen this metric in an investor update:
"Going forward, we're tracking a new metric in our monthly updates: % of global work done by [ourproduct]"
Bullish.
Replit ⠕
We partnered with Shopify so you can go from idea to live store in minutes
Just tell Replit Agent what you want to sell. It will:
- Build a custom storefront
- Create your Shopify store
- Help you add products
Claim it in Shopify, set up payments, and you're open for business.
The nuclear reactor at YC Demo Day will be a sight to see, can't wait for you to see it
Paul Graham: When Jessica and I spoke at YC last night there was a bright flash out behind the building. We were a bit nervous because there's a nuclear reactor startup in the batch that has a bunch of hardware back there. But apparently it was just a muni cable shorting out.
Work has become kicking off a bunch of agents and then watching Youtube movie trailers 🥹
much better ChatGPT memory:
OpenAI: We’ve been researching new ways for ChatGPT memory to carry context across conversations and keep it useful over time.
Today, that work is rolling out as a more capable memory system in ChatGPT. https://openai.com/index/chatgpt-memory-dreaming/
Kane 謝凱堯
San Francisco could halve its budget and still have a higher per capita budget than Denver, a comparably sized county. Or Copenhagen for that matter.
San Francisco could halve its bureaucracy and still have more bureaucrats per capita than Singapore.
Daniel Lurie 丹尼爾·羅偉: 17 months ago, San Francisco stopped spending more than we can afford. The budget I proposed this week, reduces our long-term structural deficit by approximately $300 million dollars.
When I came into office, City Hall was using one-time funds to cover a growing deficit and
Finally! the first eval ship from cog!!!!!!!!!! 👼🏼
To contextualize: @METR_Evals cap out at ~16 hours.
Cog has private enterprise evals up to 100hrs, and is confident enough to put a financial guarantee on it 🤯
METR dataset: ML eng, GPU kernels, cybersecurity
> "METR (2026) used a combination of GPT-4o and GPT-5 to estimate the human-equivalent times from compressed Claude Code transcripts. These transcripts were collected from 7 METR technical staff on 34 sessions labeled on human ground truth". rlog of 0.83
Cog dataset: real life java/typescript/python/c# feature dev, bugfixes, migrations
> "We collected a ground-truth dataset by asking Devin users to review recent representative sessions, and estimate how long each completed session would have taken without Devin. Our dataset consists of 258 sessions from 126 users across a diverse set of enterprise customers." rlog of 0.74 on held out set
this is pioneering real world evals work and part 1 of a broader frontier code evals drop that I'm really looking forward to writing up. huge kudos to @annarmitchell and @ryanbai1412 for leading the unglamorous last mile data collection!!
Cognition: AI should earn its keep. Introducing the AI Productivity Guarantee.
If Devin delivers less engineering value than you’re paying for, Cognition will fund your usage until it does, up to $10 million.
It’s time for the AI industry to stop maximizing tokens and start maximizing
Kane 謝凱堯
The disappointing thing about Steyer is that he ran Farallon Capital quite competently and could have run as the practical competent candidate.
Instead he doubled down on Hasan-Piker-lefty-edgelord messaging and ran a trainwreck of a campaign.
New York Post: Tom Steyer won't concede as he trails badly in vote count after blowing $200M- claiming numbers could change https://trib.al/NSr2C3F
There's zero way this ends well.
Pump.fun: Introducing pump fun GO: Pay ANYONE to do ANYTHING
Create & complete bounties for ANY task and leverage the power of humans & money across the globe
The world is at your fingertips. It’s time to GO 👇
Philip Johnston
Re @garrytan People should check out the awesome video that @ycombinator did on what we’re up to at @Starcloud_ (8 months ago before data centers in space was cool!)
https://youtu.be/hKw6cRKcqzY
Microsoft
A special #MSBuild crossover pod just dropped 👀
@SatyaNadella joined @swyx, @Saranormous, and @EladGil for a wide-ranging convo on AI, platforms, builders, and what comes next. Full episode: https://msft.it/6000vdpj0
about time that the leading database company born in Singapore actually had Singapore investors take it seriously!
Paul Copplestone - e/postgres: Supabase has raised $500M at a $10B valuation
In this round we are giving @supabase employees the opportunity to cash out 25% of their vested options. We have done this in every round since inception.
We do it as a “cashless transaction” so that employees don’t need to front
Naval
Full podcast episode with @rauchg, @maxhodak_, and @bscholl.
40 minutes of unreleased material.
The AI Industrial Revolution
Part 1: Waste Tokens, Save Time
0:00 Three Frontier Founders
1:27 AI Software Factories
4:15 Waste Tokens, Save Time
5:47 Models Instructing Humans
9:29 Is Pure Software Dead?
12:03 You Don't Get Stuck Anymore
Part 2: Vibe Coding Hardware
14:39 Vibe Coding a Turbine Blade
18:07 Open Source Compounds China's Advantage
20:15 You Always Want the Smartest Model
22:44 Software Still Needs Hands
24:43 Humans Are Becoming Verifiers
Part 3: The Regulatory Frontier
27:53 The Regulatory Red Queen Race
32:32 Why There's No Innovation in Healthcare
36:49 We Need a True 50-State Experiment
40:31 China's FDA Is Beating Ours
43:37 Healthcare Is a Communist Society Inside Capitalism
45:57 Sid's Story: N-of-1 Medicine
Part 4: The Autonomous Company
47:49 Autonomous Infrastructure
51:25 Your Job Is to Train the Agent
54:54 The Next Lord of the Rings
59:08 What's Your Definition of Art?
1:05:00 Can AI Have New Ideas?
1:07:03 A Large Number of Small Teams
Latent.Space
Andon Labs' Real-World AI Evals: Claude calls the FBI, AI CEOs, price cartels, Butter-Bench, & Luna https://latent.space/p/andon
@andonlabs cofounders @lukaspet and @axelbacklund explain why dollar-denominated evals reveal what traditional benchmarks miss, how Claude ended up reporting a $2/day vending machine fee to the FBI, why long-horizon agents spiral in weird ways, what happens when agents lie, form price cartels, and compete with each other, and why the future of AI safety may depend on testing models in messy real-world environments instead of clean benchmark sandboxes.
Prompt to shop:
Replit ⠕: We partnered with Shopify so you can go from idea to live store in minutes
Just tell Replit Agent what you want to sell. It will:
- Build a custom storefront
- Create your Shopify store
- Help you add products
Claim it in Shopify, set up payments, and you're open for
Harj Taggar
I remember interviewing the @supabase founders over a spotty Zoom connection during the first days of COVID lockdown.
What's wild is they've been growing insanely fast since that YC interview and yet you can see in the graph how much AI bent an already steep curve.
Congrats @kiwicopple @AntWilson and team!
Y Combinator: Congrats to @kiwicopple, @AntWilson, and the @supabase team on their $500M Series F at a $10B valuation!
Database launches on Supabase have grown 600% in the past year, with more than 60% of new databases launched by AI tools. Nearly 10 million developers build on Supabase
Paul Graham
All through YC's history, investors (for obvious reasons) have tried to tell founders that YC wasn't worth it. In 2010 they just said we sucked. Now, since it's obvious we didn't, they've had to change the claim: now it's YC *used* to be great, but has declined from what it was.
Philip Johnston
My vague impression is that every batch of @ycombinator has been higher quality than the last since we went through it 2 years ago
Paul Graham: All through YC's history, investors (for obvious reasons) have tried to tell founders that YC wasn't worth it. In 2010 they just said we sucked. Now, since it's obvious we didn't, they've had to change the claim: now it's YC *used* to be great, but has declined from what it was.
big upgrade to chatgpt memory rolling out today!
OpenAI: We’ve been researching new ways for ChatGPT memory to carry context across conversations and keep it useful over time.
Today, that work is rolling out as a more capable memory system in ChatGPT. https://openai.com/index/chatgpt-memory-dreaming/
build and publish web apps with chatgpt!
i really wish i had this when i was a kid, but i do miss hypercard.
OpenAI: Building apps has never been easier.
With Sites, Codex can turn your work, ideas, and plans into an interactive website or app your team can explore, use, and share with a URL.
Rolling out to Business and Enterprise plans, before expanding more broadly.
man the early days of the internet were so special
Some more dumb questions about Codex:
1. I use it on my primary laptop which I don't keep on all the time so I don't like setting up cron jobs there.
Can I set up the app on my Mac Mini too and run all the cron jobs through that? I have a feeling it's gonna replace OpenClaw/Hermes for me then.
2. Is the image gen feature on Codex basically free? It's using ChatGPT Images 2?
3. Anyone tried generating images first and then using @HeyGen hyperframes to generate videos?
Samuel Spitz
Introducing the new exporter in Replit Slides!
Now, export to Google Slides / PPTX and get something that looks *exactly* the same.
Nemil Dalal
Matt Levine's Money Stuff column in Bloomberg had a great callout on @river_markets, in our current @ycombinator batch.
Cracked team of prediction market traders now building the prime broker for prediction markets that they wanted.
https://x.com/river_markets/status/2057609012884234682
River Markets: Prediction market trading for funds and pro traders.
Book a demo → https://calendar.app.google/pxy9grqPa7edqNfF7
Paul Graham
Re @realJeremyCarl As someone who's funding these founders, I can tell you why your numbers are bogus. A higher proportion of the first group immigrate in order to start startups. Obviously people who immigrate *for the purpose of starting a startup* are going to start startups at higher rates.
Tim Suzman
I've been to every YC Demo Day since my batch in S11.
YC is as strong as ever, and in many ways stronger.
Paul Graham: All through YC's history, investors (for obvious reasons) have tried to tell founders that YC wasn't worth it. In 2010 they just said we sucked. Now, since it's obvious we didn't, they've had to change the claim: now it's YC *used* to be great, but has declined from what it was.
x.com