​Ralphthon @SF

​✅ Hack Guide: https://ralphthon.team-attention.com/guide

​If you want to touch your laptop, you put on a lobster costume first. 🦞

​While your AI agent codes, you meet the builders who are shaping what comes next.

​This isn't just a hackathon. It's your entry point into a top-tier network of agent-native engineers

​While your agent works, you're in the room with speakers, builders, and conversations you won't find anywhere else.

​Prizes

• ​🥇 1st Place — $10,000 in API credits + 6 months of ChatGPT Pro

• ​🥈 2nd Place — $5,000 in API credits + 6 months of ChatGPT Pro

• ​🥉 3rd Place — $3,000 in API credits + 6 months of ChatGPT Pro

​All accepted participants receive $100 in OpenAI API credits for the event.

​⚠️ In-person only (San Francisco) · Application required · Teams of 1–4

​⚠️ This event is being filmed by a professional video crew. If you prefer not to appear on camera, please let us know at check-in — we'll provide a sticker for your name badge so the crew knows to keep you out of frame.

​🔌 Bring a power strip! Outlet access at the venue may be limited — bringing your own power strip helps you and your neighbors stay charged.

​Speakers

• ​​Geoffrey Huntley: Creator of Ralph Loop

• ​​Romain Huet: Head of Developer Experience @OpenAI, working on Codex

• ​​Mo Tiwari : ex @OpenAI, Stanford CS PhD

• ​​Jaegyu Lee: Winner of 1st Ralphthon, Maintainer of ouroboros

​Judges

• ​Q — Maintainer of oh-my-opencode(40K ⭐)

• ​Yeachan Heo (bellman) — Maintainer of oh-my-claude-code(11K ⭐) & oh-my-codex

• ​Yujong Lee - Co Founder of char.com YC S25 (8K ⭐)

• ​John Jeong - CEO of char.com YC S25 (8K ⭐)

• ​Chanhee Lee - Co Founder of Aside, YC F25

• ​CJ Na - Co Founder & CTO of Carvis, ex) Cruise

• ​Jay Warida - Co Founder & CEO of Carvis

• ​Mantra Patel - Engineer at Stack Auth (YC S24)

• ​Justin Shin - Kakao Ventures

• ​Sheshansh Agrawal - Research Lead @ Contextual AI

• ​George Zhang - Maintainer of OpenClaw & Pi

• ​Austin Wang - Founder & CEO, Manaflow (YC S24) & cmux.com (11k stars)

• ​Ben Kim - Nitrode (YC W25)

• ​Shriank K. - Co-Founder @ Seed Labs

​Schedule (Tentative): 28th March SF

• ​8:30 AM – Doors open · Check-in · Team building

• ​9:30 AM – Welcome & intro · How to run Codex + Ralph Loop like a pro

• ​10:00 AM – Hacking begins · Spec writing & agent setup

• ​12:30 PM – Ralph begins. Agents run autonomously.
  If you want to touch your laptop, you put on a lobster costume first. 🦞

• ​12:30 – 3:30 PM – While your agent works, you connect

• ​3:30 PM – Laptops open · Review what your agent built & prepare your demo

• ​4:30 PM – Submission deadline · Science Fair begins — every team demos at their table, judges walk the floor

• ​5:30 PM – Speaker session 🎤

• ​6:30 PM – Finalist demos on stage

• ​7:30 PM – Awards

• ​~8:00 PM – Networking

​Sponsored by

• ​OpenAI

• ​Naver D2SF

• ​Hanriver Partners

• ​Kakao Ventures

• ​Bass Ventures

• ​Weights & Biases is the AI developer platform powering the AI industry. AI labs and enterprises from multiple industries — including AstraZeneca, Canva, Cohere, OpenAI, Meta, Snowflake, Square, Toyota, and Wayve — rely on Weights & Biases as their system of record for training and fine-tuning AI models and developing agentic AI applications with confidence. Weights & Biases has been acquired by CoreWeave to deliver the leading AI Cloud Platform — purpose-built to develop, deploy, and iterate AI faster for the world’s leading AI labs and enterprises. The AI Developer Platform Weave is a developer-first toolkit for tracing, debugging and evaluating your AI apps. Try Weave for free today: https://wandb.com/weave.

​OSS Partners

​Accumulated stars of 60K from OSS partners

• ​OmX (Oh my Codex)

• ​OmO (Oh my Opencode - OpenAgent)

• ​OmC (Oh my Claude Code)

​Previous in Seoul

​Ralphthon originated in Seoul (Feb 28 – Mar 1, 2026) as a 24-hour overnight format where builders set up agents, went to sleep, and woke up to what shipped.

​Notable open-source contributions from Seoul:

• ​oh-my-claude-code 9K ⭐ — 2nd place winner's harness

• ​Ouroboros 1k ⭐ — 1st place winner's harness

​About

​Organized by Team Attention. We run creative hackathons, clubs, and open-source projects at the intersection of community and AI-native workflows.

​Previous events: Skillthon (Anthropic-sponsored) → Ralphthon Seoul (OpenAI + Kakao Ventures) → Ralphthon SF

​All attendees must submit an application and be approved to attend.

​Contact

​GB Jeong linkedin.com/in/gb-jeong