Y Combinator turned a sports arena into AI's biggest pep rally

Y Combinator's Startup School drew over 6,000 attendees to San Francisco's Chase Center for a two-day conference featuring AI executives including OpenAI CEO Sam Altman, Nvidia CEO Jensen Huang, Meta's Alexandr Wang, Anthropic's Boris Cherny, and Google's Jeff Dean. The event, three times larger than last year, included breakout sessions, an ML research symposium, and an 'Office Hours Simulator' where attendees could speak with an AI version of YC partner Brad Flora. Anthropic offered six months of its $200 Claude Max plan to all attendees, while Meta provided $1,000 in free credits.

The CEOs walked out of the light-up tunnel like they were preparing to wrestle. A cameraman walked ahead of them, broadcasting their entrances to a San Francisco arena. Rather than trading jabs, executives like Sam Altman https://www.businessinsider.com/sam-altman-openai-the-singularity-agi-prediction-anthropic-nvidia-2026-7 , Jensen Huang, and others traded advice. They were at the Chase Center this weekend for Y Combinator's Startup School, a two-day conference for "technical builders" looking to make it big in entrepreneurship. Startup School had everything: light-up headphones, AI versions of the YC partners, and freebies upon freebies. Here's a quick look at the spectacle. omg hi sam — Blaire Pang @blaire pang @sama wrapping up @ycombinator startup school with @garrytan and @sama 🔥🔥 pic.twitter.com/TiLu8wjxdL July 27, 2026 Back to startup school The Chase Center https://www.businessinsider.com/how-chase-center-built-warriors-cost-perfect-storm-2019-3 is usually decked out in the Golden State Warriors' blue and gold. For one July weekend, it was all Y Combinator orange. A large orange Y was propped up outside the arena, inviting in the wannabe-founders from far and wide. The event was 3x larger than last year, with over 6,000 attendees, YC leaders said. The accelerator also helped people outside the Bay Area with travel support. Things you see at YC SUS — Sam siavoshian @samsiavoshian pic.twitter.com/GU9fe1FJOi July 26, 2026 Inside the arena, speakers Altman and Huang received rapturous applause. Other speakers included Meta's Alexandr Wang https://www.businessinsider.com/alexandr-wang-meta-ai-feuds-chill-pill-2026-5 , Anthropic's Boris Cherny, and Google's Jeff Dean. The "ClawFather" himself, OpenClaw founder Peter Steinberger https://www.businessinsider.com/openclaw-peter-steinberger-ai-token-bill-2026-5 , was in the room. The only major AI lab not formally represented was SpaceXAI. Some of these speakers offered product freebies. Cherny told the crowd they'd all get six months of Anthropic's $200 Claude Max plan. Wang offered $1,000 in free Meta credits. Altman had his own deal for YC founders two months ago: tokens for equity https://www.businessinsider.com/sam-altman-openai-offer-tokens-for-startup-equity-y-combinator-2026-5 . Attendees described breakout sessions in the stadium, where they wore headphones to separate the noise. They also attended one of about 100 parallel small group sessions, according to general partner Ankit Gupta, including an ML research symposium. And then there was the "Office Hours Simulator." One attendee spoke to an artificial Brad Flora — only for the real one to shake his hand. — Brad Flora @bradflora YCStartupSchool dropping in to say hello to a builder doing an office hour with AI Brad. He said AI me was asking good questions about his GTM motion pic.twitter.com/7lN8UMOmmI July 25, 2026 Memes about the 'megachurch' Y Combinator also gifted attendees a portable battery. The only potential concern flagged by one attendee: it might look a bit too much like an explosive device to fly home with. Young tech bros post anything and everything on X https://www.businessinsider.com/taste-new-core-skill-ai-debate-memes-2026-2 . Thus, Startup School had its fair share of memes — the battery being one of them. YC has given us this portable battery — lucas liao @liao lucas how am i supposed to convince TSA this isn't a bomb bro pic.twitter.com/TkRbkrPz8E July 25, 2026 Other memes included the line for the men's room which, in true "Man Francisco" https://www.businessinsider.com/inside-party-showroom-enforced-gender-ratio-san-francisco-tech-dating-2025-8 fashion, was longer than the line for the women's room. The event's biggest meme, though, was religious. "YC Startup school giving megachurch vibes these days," OpenAI's Bill Chen wrote. While some joked about the Startup School's so-called holiness, others fashioned it into a criticism. Jay Kapoor, a general partner at VSC Ventures, wrote that Startup School looked like "a megachurch for people who only worship money." YC Partner Tyler Bosmeny https://www.businessinsider.com/y-combinator-startup-school-experience-2012-8 clapped back: "New York City finance bro says what?" all men do is lie, cheat, and go to yc startup school — michelle @michellewang857 July 25, 2026 For others, the grandness of Startup School was an abandonment of YC's principles. "The YC brand felt like it was designed to filter out status chasers," Spellbook cofounder Scott Stevenson wrote. "You can feel the herd rushing into an overflowing barn. A stadium sized barn." YC has always been hyper-selective, with its 1% acceptance rate https://www.businessinsider.com/how-to-apply-y-combinator-application-down-market-successful-2022-8 . Still, YC general partner Christopher Golda defended the event's scale, writing that the accelerator's goal was never "scarcity." "There are far more people who can, should, and will be in the arena," Golda wrote. "So yeah, we rented out an arena."