Ralphthon SF × Seoul
Ralphthon #2 — Cross-City (SF + Seoul)
Manifesto
Same day, two cities. SF and Seoul split the day.
About
The Ralph Loop format proven in Seoul, deployed simultaneously across two cities. March 28 SF (~150, W&B 400 Alabama) + March 29 Seoul (~84, Naver D2SF) split the same day across time zones. Single-day event — morning check-in to evening awards. ~234 builders + $18K prizes + cross-city speaker sessions.
Highlights
- 01~234 total builders (SF ~150 + Seoul ~84)
- 02SF — W&B Office 400 Alabama St · 2026-03-28
- 03Seoul — 2026-03-29 simultaneous
- 04Romain Huet (OpenAI, Head of DevEx) speaker
- 05Mo Tiwari (Google DeepMind) speaker
- 06Jeff Wang (Cognition / Windsurf CEO) speaker
- 071st Orchid — $10,000 + ChatGPT Pro 6M
- 08Cross-city live speaker sessions
- 09$100/participant API credits + $18K total prize pool
Program
08:30
Doors open · Check-in · team building
09:30
Welcome · Codex + Ralph Loop intro
10:00
Hacking starts — spec + agent setup
12:30
Ralph starts — autonomous agent execution
15:30
Laptops open — results verified
16:30
Science Fair (table demos)
17:00
Cross-city speaker session
18:00
Finalist stage demos · awards
People
Goobong Jeong
Organizer
Romain Huet
Speaker
OpenAI
Mo Tiwari
Speaker
Google DeepMind
Jeff Wang
Speaker
Cognition
Jaekyu Lee
Cross-city Speaker
Seoul Winner
Hoyeon Lee
SF Operations Lead
Winners
1
Orchid
$10,000 + ChatGPT Pro 6M
2
JSR
$5,000 + ChatGPT Pro 6M
3
Memoreei
$3,000 + ChatGPT Pro 6M
Quotes
“We proved the Ralphthon format in Seoul with OpenAI and Kakao Ventures. Now we bring it to San Francisco.”
— Event Thesis
Previous Drop
#004 Ralphthon
Next Drop
#006 IronClaw Meetup