challenges

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The five tasks every model runs. Full prompt, full rubric, no black box — click into any of them to see exactly what's being judged.

01

fizzbuzz

9.7

Classic FizzBuzz — tests basic correctness and code style

best so far: Claude Haiku 4.5
02

binary-search

7.8

Binary search implementation with full docs

best so far: Claude Haiku 4.5
03

api-client

2.7

Write a small HTTP API client class with error handling and docs

best so far: Claude Haiku 4.5
04

readme-writer

9.0

Write a README for a CLI tool — tests documentation ability directly

best so far: Claude Haiku 4.5
05

refactor

8.7

Refactor messy code and explain each change

best so far: Claude Haiku 4.5