I mean, humans do this too... If I tell an interviewee that they've done something wrong a few times, they'll have less confidence going forward (unless they're a sociopath), and typically start checking their work more closely to preempt problems. This particular instance of in-context pattern matching doesn't seem obviously unintelligent to me.

This was code that finished successfully (no stack trace) and rendered an image, but the output didn't match what I asked it to do, so I told it what it actually looked like. Code Interpreter couldn't check its work in that case, because it couldn't see it. It had to rely on me to tell it.

So it was definitely writing "here's the answer... that failed, let's try again" without checking its work, because it never prompted me. You could call that "hallucinating" a failure.

I also found that it "hallucinated" other test results - I'd ask it to write some code that printed a number to the console and told it what the number was supposed to be, and then it would say it "worked," reporting the expected value instead of the actual number.

I also asked it to write a test and run it, and it would say it passed, and I'd look at the actual output and it failed.

So, asking it to write tests didn't work as well as I'd hoped; it often "sees" things based on what would complete the pattern instead of the actual result.