# Prompt uncertainty

Prompt uncertainty scoring helps you triage risky or underspecified user requests before they reach your production model. `PromptUncertaintyJudge` highlights missing context or conflicting instructions that could confuse an assistant.

Run the judge on raw prompts to decide whether to request clarification, route to a human, or fan out to more capable models.

```python title="Triaging tricky prompts"
from opik.evaluation.metrics import PromptUncertaintyJudge

prompt = (
    "Summarise the attached 200-page legal agreement into a single bullet, "
    "guaranteeing there are no omissions."
)

uncertainty = PromptUncertaintyJudge().score(input=prompt)

print(uncertainty.value, uncertainty.reason)
```

## Inputs

The judge accepts a single string via the `input` keyword. You can optionally pass additional metadata (dataset row contents, prompt IDs) via keyword arguments – these will be forwarded to the underlying base metric for tracking.

## Configuration

| Parameter      | Default      | Notes                                                                             |
| -------------- | ------------ | --------------------------------------------------------------------------------- |
| `model`        | `gpt-5-nano` | Swap to any LiteLLM chat model if you need a larger evaluator.                    |
| `temperature`  | `0.0`        | Lower values improve reproducibility; higher values explore more interpretations. |
| `track`        | `True`       | Disable to skip logging evaluations.                                              |
| `project_name` | `None`       | Override the project when logging results.                                        |

The evaluator emits an integer between 0 and 10 (normalised to 0–1 by Opik). Inspect the `reason` text for rationale and per-criterion feedback, and trigger follow-up automations when scores cross a threshold.

## Related pages

- [Overview](./evaluation-metrics-overview.md)
- [Heuristic metrics](./evaluation-metrics-heuristic-metrics.md)
- [Hallucination](./evaluation-metrics-hallucination.md)
- [LLM Juries](./evaluation-metrics-llm-juries.md)
- [G-Eval](./evaluation-metrics-g-eval.md)
- [Conversation-level GEval Metrics](./evaluation-metrics-g-eval-conversation-metrics.md)
- [Compliance risk](./evaluation-metrics-compliance-risk.md)
- [Moderation](./evaluation-metrics-moderation.md)
- [Meaning Match](./evaluation-metrics-meaning-match.md)
- [Usefulness](./evaluation-metrics-usefulness.md)

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