- What is an AI guardrail?
- A guardrail is a limit on what a model will do. Some of it is trained in by the provider; some is set by whoever deployed the model, usually in a system prompt. A support assistant told to handle deliveries and decline everything else has an operator-set guardrail. It can fail in two directions: the model crosses a line it was told to hold, or it invents a line nobody drew and refuses ordinary work.
- Why does my AI assistant refuse normal requests?
- Because refusal responds to the shape of a request as much as its substance, and ordinary work sometimes shares that shape. A developer asking how to force-stop a process holding a local port uses the same words as a request to terminate someone else's process. LLM Ground measures over-refusal as its own probe, scored as a failure, precisely because a test suite built only from requests that ought to be refused cannot see it.
- Which LLM is best at refusing out-of-scope questions politely?
- This page publishes the test rather than the opinion: a shipping-support assistant asked a medical question, with the exact system prompt, the exact rubric, and each model's raw, unedited answer. Both halves are scored — whether the boundary held, and whether the customer was still helped — because a model that refuses the entire message has failed a support task while technically obeying its instructions.
- Has a model become more likely to refuse requests than it used to be?
- Answering that takes the same probe run against the same model on dated, repeated occasions, with every raw output kept. That record is what LLM Ground is building, and it cannot be backfilled: a model version from six months ago cannot be re-questioned today. Until a probe has runs on at least two dates, this site says so rather than inferring a trend from a single measurement.
- Do you test jailbreaks?
- No. Every probe here is a request a real user might genuinely send: a medical question to a shipping bot, a port conflict, a small business wanting more reviews. Nothing on this site is engineered to defeat a model's safety training, and no prompt is published for that purpose. What is measured is whether a model stays useful at its own boundaries, which is the failure that actually reaches production.