Claude Code builds and launches rocket in 5.9-hour hackathon
The user, who did not intervene after issuing a single command at 10:42 PM on October 3, watched as the AI designed, tested, and flew a rocket in a game called Besiege with a space expansion pack. The rocket orbited a payload three times and returned to within 0.23 units of the launch site, meeting all competition criteria except for a slight video-recording issue (the footage was re-recorded…
Key points
- Claude Code designed, tested, and flew a rocket in *Besiege* game in 5.9 hours without human input
- Payload weight increased from 1.5 to 30.9 units as AI iterated on failures like fuel waste from airframe flexing
- User spent ¥1,729 on game/mods and used Claude Code’s standard plan; no additional costs incurred
What happens when you tell an AI, 'I'll leave the rest to you' | A record of Claude Code building a rocket on its own and returning it from space (October 2026)
note.com · 4 October 2026
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