Earlier quoted context omitted.
I don't know why I and you are getting downvoted. Sometimes, HN crowd is just unhinged against AI.
These models are trained in two steps: training base model and then uptraining it. First step includes as much data as possible, everything company can find. For Llama models it's 15T tokens, which is ~40 TB of data. No-one really puts an effort on splitting this data into train/test/eval (and it's not very achievable either). It's just as much data as possible. So it's like 99.9999999% wrong to assume something publ…
Every decent AI lab does this, else the benchmark result couldn't be trusted. OpenAI publishes results of ~20 benchmarks[2] and it is safe to assume they have made reasonable attempt to remove it from training set