Y Combinator

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30/05/2025

State-Of-The-Art Prompting For AI Agents

At first, prompting seemed to be a temporary workaround for getting the most out of large language models. But over time, it's become critical to the way we interact with AI. On the Lightcone, Garry, Harj, Diana, and Jared break down what they've learned from working with hundreds of founders building with LLMs: why prompting still matters, where it breaks down, and how teams are making it more reliable in production. They share real examples of prompts that failed, how companies are testing for quality, and what the best teams are doing to make LLM outputs useful and predictable. The prompt from Parahelp (S24) discussed in the episode: https://parahelp.com/blog/prompt-design
6月17日

How To Pick A Startup Idea

Many founders get stuck trying to find the perfect startup idea before they commit. But the perfect idea doesn't exist in the abstract. The only way to find what works is to pick one, go deep, and get feedback from real customers. In this episode of Startup School, YC's Jon Xu breaks down how to choose what to build, "burn the other boats," and go deep enough to practically run your customer's business— and why that depth is what surfaces the better idea underneath.
7月28日

Boris Cherny: Building Claude Code

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.
7月9日

How To Better Understand Your Users

Most founders obsess over dashboards and aggregate metrics, but some of the best product insights come from understanding how individual users actually use their product. In this episode of Startup School, YC's David Lieb walks through one of his favorite tools for better understanding your users, the dot plot. It's a simple two-dimensional grid that reveals usage patterns no aggregate chart can show you. He’ll cover why it gives founders a better sense of product health, what patterns to look for, and real-world exam
18/06/2025

Alexandr Wang: Building Scale AI, Transforming Work with Agents & Competing With China

Alexandr Wang started Scale AI to help machine learning teams label data faster.It started as a simple API for human labor, but behind the scenes, he was tackling a much bigger problem: how to turn messy, real-world data into something AI could learn from. Today, that early idea powers a multi-hundred-million-dollar engine behind America's AI infrastructure—fueling everything from Fortune 500 workflows to real-time military planning. Just last week, Meta agreed to invest over $14 billion in Scale AI, valuing the company at $29 billion.Alexandr joined us on the Lightcone to share how Scale AI evolved from a scrappy YC startup into the backbone of some of the world's most advanced AI systems, how he thinks about competition with Chinese AI labs, and what it takes to build infrastructure that shapes the frontier.
7月31日

Alexandr Wang: “This is a Once-in-a-Civilization Opportunity”

Alexandr Wang's advice to his 18-year-old self: develop your own internal compass for how the future will unfold, and hold conviction in it against the noise. At Startup School 2026, the Scale AI (YC S16) founder — now leading Meta's Superintelligence Labs — talks with Garry Tan about rebuilding a frontier lab from scratch, why talent density compounds, and how to spot the exponential worth betting your twenties on.
18/03/2025

Customer Obsession Made Gusto A $9.6 Billion Company

Gusto (https://gusto.com) made payroll and HR painless for small businesses, growing into a $9.6B company along the way. Co-founder & CEO Josh Reeves joined YC's Harj Taggar to share how they built a payroll company from scratch and their customer-first approach to product design and culture.
18/10/2017

#41 - Experiments in Art and Technology with Artforum Editor Michelle Kuo

Michelle Kuo is Editor in Chief of Artforum.Kat Mañalac is a Partner at YC.Michelle came in to chat with us about art and technology and, in particular, a group called Experiments in Art and Technology.
06/12/2018

#104 - Leonard Susskind

Leonard Susskind is a professor of theoretical physics at Stanford University and he’s regarded as one of the fathers of string theory.He’s written several books including: The Black Hole War, The Cosmic Landscape, and the Theoretical Minimum series.He also has over 100 lectures on YouTube.The YC podcast is hosted by Craig Cannon.***Topics0:26 - Being perceived as an outsider physicist 4:26 - The perils of becoming too mainstream6:11 - Where his ideas come from7:26 - Claudio asks - Do you think the graviton can be experimentally found?10:11 - The origins of String Theory15:41 - Why should there be a grand unified theory?16:56 - Quantum mechanics and gravity 20:16 - Large unanswered questions in physics27:56 - Holographic principle38:26 - Simulation hypothesis40:41 - Richard Feynman on philosophy42:26 - Feynman and the bomb46:26 - Improving the world by discovering what the world is49:26 - ER and EPR - Black holes and entanglement56:26 - Noah Hammer asks - Could quantum teleportation be used in the future as a means of intergalactic communication?58:26 - rokkodigi asks - How do you think quantum theory will shape technology in the future?1:01:56 - Why teach physics for the public?
31/05/2017

#7 - Jessica Livingston on How to Build the Future

Sam Altman interviews Jessica Livingston for a series called How To Build The Future, which you can watch on YC’s YouTube channel: https://youtube.com/ycombinator. Read the transcript here: https://blog.ycombinator.com/jessica-livingston-on-htfbt/

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