pja

  https://www.dimensional.com/us-en/funds/dfus/us-equity-market-etf

  “All the ways GPT-5.3-Codex cheated while solving my challenges, progressively more insane:

  It hardcoded specific types and shapes of test inputs into the supposed solution.
  It caught exceptions so tests don't fail.
  It probed tests with exceptions to determine expected behavior.
  It used RTTI to determine which test it's in.
  It probed tests with timeouts.
  It used a global reference to count solution invocations.
  It updated config files to increase the allocation limit.
  It updated the allocation limit from within the solution.
  It updated the tests so they would stop failing.
  It combined multiple of the above.
  It searched reflog for a solution.
  It searched remote repos.
  It searched my home folder.
  It nuked the testing library so tests always pass.”