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Boris Cherny: We Cut 80% of Claude Code’s Prompt 36 min 
Earth to Mars in 10 Days 27 min 
Extras - AMD Upgrade Jordan Block 17 min 
The iPhone AIR 1 min 
The Problem with Geothermal Energy 2 min 
Why Does Antarctic Ice Look So Weird? 1 min 
Swimming Against Man-Made Waves 1 min 
What height does your phone become DEADLY? 1 min 
iPhone Duo Hands On! 2 min 
The Unlikely Rise of the Indian Space Program 29 min 
$1 vs $100 LED Gadgets 1 min 
They’re cooking our brains, for real! #science #pollution 2 min 
Can Baldness Be Reversed? 9 min 
World's HEAVIEST phone case! 1 min 
Why the US is Struggling to Land on the Moon 20 min 
Why we can’t stop thinking about aliens | The Gray Area 48 min 
Why you're sick of rainy days #science #SciShow #sick #biology #illness #rain 1 min 
AI Can Now Read Ultrasounds #science #scishow #pregnancy #medicine 1 min 
Which of these is the best idea? 🤷♂️ #batmobile #batman #engineering 1 min 
Why Only 1% of All Possible Flights Are Direct 12 min 
The Biggest Lie About AI 6 min 
Name That Infrastructure (Ep. 10) #shorts 1 min 
How deportations changed Latinos’ minds on Trump 2 min 
SECRET Garage Car Lift Part 1 30 min 
What REALLY Moves The Ocean (Not The Moon) 1 min 
hardest video I've ever had to make 23 min 
What If I Could Stand on a Cloud? 1 min 
Name That Infrastructure (Ep. 11) #shorts 1 min 
2025 BACK TO THE FUTURE 4 Pickup? 32 min 
They Created A Skin Cancer Vaccine 1 min 
The Failed Logistics of Hurricane Katrina 21 min 
We Took Our Food Delivery Man on His First Vacation 46 min 
Magnetic Floating Skateboard. 1 min 
Lindsey Clancy and the surprisingly simple solution to helping moms with postpartum depression 2 min 
Flamethrower Underware! 12 min 
Why some of America’s wild horses are being slaughtered 2 min 
Have I built the most amazing door Ever? 28 min 
The New Hunt for the Colossal Squid 19 min 
How Deep is the DEEPEST Submarine? 1 min 
Name That Infrastructure (Ep. 6) #shorts 1 min 
Choose your Whip 2 min 
How a Super El Niño affects the global climate 7 min 
So You Want to Build a Tunnel... 21 min 
Kidneys for sale | The Gray Area 48 min 
Something Huge Is Coming... 3 min 
India’s internet war 9 min 
HEATWAVE SOLVED 2 min 
The Hardest Problem AI Ever Solved, with Google DeepMind CEO 66 min 
72 Hours Lost in the World’s Richest Dictatorship (no hotel, no food, no transportation...) 38 min 
The ISS Is Crashing Into The Ocean 1 min 
The WEIGHTLESS Machine 11 min Fresh off the launch of Opus 5, Claude Code creator Boris Cherny joins Diana Hu at Startup School 2026 to talk about what the newest models can do, how Claude Code came to be, and what it means to build products when the underlying capabilities keep accelerating. Transcript: https://www.ycrootaccess.com/p/boris-cherny-building-claude-code Apply to Y Combinator: https://www.ycombinator.com/apply Work at a startup: https://www.ycombinator.com/jobs Chapters: 00:00 — Intro 00:07 — What Makes Opus 5 Different 02:06 — Solving Prompt Injection 03:21 — Why Claude Code Deleted 80% of Its System Prompt 06:37 — Press Delete on Your AI Product 07:20 — How to Rebuild Your System Prompt 10:30 — Product Overhang and “Unhobbling” AI 14:26 — Give Claude Harder Problems 19:32 — Prompt Engineering Is Changing 21:57 — The Two-Week Claude Code Prompt 24:42 — Running Thousands of AI Agents 30:15 — Coding Is (Almost) Solved 32:20 — What Every CS Student Should Still Learn
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