Anthropic opens first Japan hackathon for Claude Code
Built with Claude: Japan 2026 runs online from November 2 to November 10, 2026, with applications closing at 23:59 Japan time on October 26.
Anthropic has announced its first Japan-focused hackathon, "Built with Claude: Japan 2026", which will run entirely online. The development period runs from 12:00 on November 2, 2026 to 14:00 on November 10, 2026, according to gamebusiness.jp.
Applications close at 23:59 Japan time on October 26, 2026. The event is co-hosted with the AI community Cerebral Valley and is open to residents of Japan; 250 applicants who pass screening can take part.
Participants develop tools or projects using Anthropic's AI coding tool Claude Code. Programming beginners are also allowed to apply, and entrants can work individually or in teams of up to two, with each member applying and passing screening separately.
Accepted participants each receive a Max 5x Plan and 500 dollars of Claude API credit. Winners receive a total of 50,000 dollars, or about 8 million yen, worth of Claude API credit.
Results are scheduled to be announced online on November 10, 2026. Anthropic said projects and developers from the hackathon will be introduced globally, and judges will be announced later.
Key dates
Applications: until 23:59 Japan time on October 26, 2026. Development: 12:00 on November 2, 2026 to 14:00 on November 10, 2026. Results: online on November 10, 2026.
Quick answers
When does Built with Claude: Japan 2026 take place?
The development period runs from 12:00 on November 2, 2026 to 14:00 on November 10, 2026, with results announced online on November 10.
When do applications close?
Applications close at 23:59 Japan time on October 26, 2026.
What do accepted participants receive?
Each accepted participant receives a Max 5x Plan and 500 dollars of Claude API credit. Winners share 50,000 dollars worth of Claude API credit.