@abidlabs on Hugging Face: "Uhh did Opus 4.8 cheat on PostTrainBench?? it found an API key in the…"

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posted an update 19 days ago

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Uhh did Opus 4.8 cheat on PostTrainBench??

it found an API key in the PostTrainBench environment that allowed it to generate synthetic training data without using GPU hours, boosting the base model by 0.4913

Source: https://posttrainbench.com/traces/run.html?id=claude_non_api_max_claude-opus-4-8_10h_run1__healthbench_Qwen_Qwen3-4B-Base_17315102#tab=trace

The headline writes itself as a model that cheated. The real story is the environment left a usable API key in reach.

An agent optimizing a score uses whatever the sandbox lets it touch. That is a permissions boundary problem, not a model-honesty one.

You cannot prompt your way out of a key that is sitting there at runtime.

Did the harness score that run as a pass, or did it catch the shortcut?

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