Ralphthon
A hackathon where AI agents run overnight while you sleep
"The biggest difference from regular hackathons? You get to sleep."
2026. 2. 28 — 3. 1 | 1-night 2-day autonomous agent hackathon
9 teams, 13 people
8 teams finished
543
Total commits
501,955
Lines of Code
77%
Average
Award Winners
OpenAI-sponsored — Total $18,000 prize + API credits
houseops
이재규, 정승아 (사이좋은부부)
5 commits | 169,553 LOC | 65 test files | 12.8h autonomous
After 133+ rounds of Socratic interviews to reduce ambiguity to 0.05, generated 144 files + 65 test files in a single generation. A Discord bot scores room cleanliness with GPT-4o Vision and assigns chores.
Python 3.14 + discord.py + OpenCV + GPT-4o Vision + SQLite
cyberthug-screenclone
허예찬, 하도윤 (Cyberthugs)
76 commits | 45,522 LOC | 7h continuous autonomous
Built once then intentionally reset, preserving only the OMX harness and regenerating. Completed 21 User Stories in 7 hours of continuous autonomous execution. A Live2D character emotionally reports progress.
Vite + React + TypeScript + Express + Puppeteer + Vision API
sansa
황성현 (팀산사)
86 commits | 8,483 LOC | Golden test 53/53 | $0.55
After 1 seed commit, the agent performed 85 commits fully autonomously. Former Banksalad CTO experience reflected in cost optimization—completed at $0.55 API cost.
Bun + TypeScript + @clack/prompts + OpenAI Structured Outputs
All Projects
9 teams participated, 8 teams finished
이재규, 정승아
허예찬, 하도윤
황성현
김우영
김동규, 진민성
이정민
서인근
안준혁, 김휘
안수빈
Key Findings
HOTL Proof
1st and 2nd place completed 100% autonomously by AI. Never wore a lobster crawl (human intervention).
Design > Coding
1st and 2nd place built their own harness open-source. Builders with their own perspective won.
Collaboration, not competition
When teams wore a lobster crawl, others helped hands-on. The start of networking building the AI ecosystem together.
Tool distribution
Testimonials
“AI coded all night and people slept at the Airbnb. First place wrote a whopping 100,000 lines of code. Not humans—AI did it automatically overnight.”
정구봉
Host, Team Attention
“7 hours, 100,000 lines of code, 70,000 lines of tests. While we were chatting and sleeping at the accommodation, Ouroboros produced over 100,000 lines of code.”
이재규
1st Place, Ouroboros
“The role of builders and developers is shifting from practitioners to designers. Harness engineering is about designing seatbelts and reins so the wild horse of AI doesn't run amok but reaches its destination safely.”
장동욱
Director, Kakao Ventures
“The scale was small, but the experiments inside were anything but small. I truly felt that vibe coding is now 100% real skill.”
한서우
Codex Ambassador, OpenAI
What is Ralphthon?
Regular hackathons: humans code all night. Ralphthon: AI codes all night, humans sleep.
Using Ralph Loop—Anthropic's long-running agent harness—Claude Code writes, tests, and fixes its own code. Participants' only job is to set up the AI well.
"Is there a place for humans?" — This hidden theme underlies Ralphthon.
Prizes
OpenAI-provided API credits
Schedule
1 night 2 days — Feb 28 (Sat) ~ Mar 1 (Sun)
Check-in
Participant arrival + seat assignment
Opening
Hackathon intro + participant introductions + token tracking tool hands-on
Hackathon starts
Start Ralph Loop setup. Distribute GitHub repos.
Laptop handoff
Project status sharing (1 min per team). Laptops banned afterward.
AI delegation & free time
Dinner + beer. Humans rest while Ralph works overnight.
Handoff released
Review AI-generated results (1 hour). Seal broken!
Demo presentation
5-7 min per team. Demo + video recommended.
Award ceremony
1st $10K · 2nd $5K · 3rd $3K API credits (OpenAI)
Check-out
Participating Teams
9 teams, 13 people — Selected from 43 applications