Dopa Drill: a joke study app built with Opus 5.5, now open source
A playful drill app its author built to try Opus 5.5. After teachers asked about it, the author published the code under MIT—excluding the mascot character, name and logo.
The Frontier Brief · Editorial analysis Reviewed 2026-09-29
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The author describes it as close to a joke app made to test Opus 5.5 and invites people to modify it freely. The repository is public with a live demo.
A rare case where a model demo became something other people—teachers—wanted to use, with source you can inspect.
What remains unverified
The code is MIT, but the “Dopakichi” character and the “Dopa Drill” name and logo are excluded; commercial use of them needs the author’s permission. The Opus 5.5 claim rests on the author’s statement.
