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  3. Eval dataset builder
Your files stay on your device

Eval dataset builder

Build, check, and export LLM eval cases: duplicate ids, missing answers, thin slices.

This tool is in beta

Still being tested. If a result looks wrong, tell us.

Report a problem

Your cases

JSONL, one object per line, or CSV with a header row. Up to 2 MB pasted, 2,000 cases per dataset.

Add a case

An empty id gets a generated one from the prefix.

Dataset check

0 turns the slice check off, up to 500
Used when a case has no id, up to 40 characters
Examples

The check flags duplicate ids, duplicate inputs, cases with no expected behaviour, and slices under the minimum. Nothing leaves this page.

Runs on this device. Nothing is uploaded.

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