Authors and runs OpenAI Evals - Python framework + registry for evaluating LLMs and LLM-backed systems with `oaieval {model} {eval-name}` CLI; supports template-based evals (Match / Includes / FuzzyMatch / ModelBasedClassify) defined in `evals/registry/evals/*.yaml` against JSONL data files in `evals/registry/data/`, plus custom Python eval classes implementing the Eval interface. Use when the user works with the openai/evals repo, needs the OpenAI-curated eval registry, or contributes new evals via PR to the registry.