Built with Claude: Japan 2026
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About this hackathon
Anthropic's first nationwide online hackathon in Japan, hosted with Cerebral Valley. Up to 250 selected builders—engineers or first-time coders—get a Claude Max 5x plan and $500 in Claude API credits each, then have a week (Nov 2–10, JST) to build something with Claude Code, from a tool only you could make to fixes for shared problems like an aging society or labor shortages. Japan residents only; solo or teams of 2, and every team member must apply. Applications close Oct 26, 11:59 p.m. JST.
- Status
- Deadline
- 2026-10-26
- Starts
- 2026-11-02
- Who
- Open to all (Japan residents only; engineers and first-time coders welcome; teams of up to 2, every member applies and 250 are selected)
- Level
- Beginner-friendly
- Prize
- $50,000 (about ¥8 million) in Claude API credits for winners; each of the 250 selected participants gets a Claude Max 5x plan plus $500 in API credits
- Size
- —
- Format
- Online · International
- Location
- Tokyo (online; placed at organizer’s city)
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Original listing (Chinese)
The full original listing below is in Chinese, as published in the Hack123 newsletter.
一句话简介：Anthropic 首次办面向日本全国的线上黑客松（Cerebral Valley 承办），用 Claude Code 花一周把想法做成能用的东西，工程师和第一次写代码的人都欢迎。
看点：两个出发点——从你最懂的领域做只有你能做的工具（手艺、日常工作里的不便），或解决老龄化、人手不足等日本社会共同课题；入选 250 人，每人送 Claude Max 5x 套餐 + 500 美元 API 额度；全程线上，最多 2 人一队，组队也要每人单独申请并通过选拔；Anthropic 会把优秀项目和作者介绍给全世界；官方 X 帖曝光超 100 万
奖金：获奖者共享 5 万美元（约 800 万日元）Claude API 额度（非现金）；入选者每人 Claude Max 5x + 500 美元 API 额度
截止日期：10月26日 23:59（日本时间）申请截止（线上，仅限日本居民）
活动日期：11月2日 12:00—11月10日 14:00（日本时间）（线上）
Summarized from the organizer’s page and public posts. Please confirm details on the official site before registering.