OpenAI Evals Bug Unknown Parameter

Hey @yanist, that’s definitely a confusing one to run into, especially after trying multiple models. From what we’ve seen, that error usually points to a parameter mismatch somewhere in the eval config rather than the model itself.

data_source.sampling_params.text.verbosity doesn’t seem to be recognized on the current API surface, so there may be an older config/example getting passed through somewhere.

Is this still happening for you? If yes, which API surface are you using for the evals right now (Responses API, Chat Completions, SDK, dashboard evals, etc.)? That’ll help narrow down where the unsupported param is coming from.

-Mark G.