> ## Documentation Index
> Fetch the complete documentation index at: https://arizeai-433a7140.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# LLM Evaluators

> Use LLM-backed evaluators in @arizeai/phoenix-evals

The `llm` entrypoint provides reusable evaluator factories that call an AI SDK model and return structured evaluation results.

<section className="hidden" data-agent-context="relevant-source-files" aria-label="Relevant source files">
  <h2>Relevant Source Files</h2>

  <ul>
    <li><code>src/llm/index.ts</code></li>
  </ul>
</section>

## Example

```ts theme={null}
import { openai } from "@ai-sdk/openai";
import { createFaithfulnessEvaluator } from "@arizeai/phoenix-evals";

const faithfulness = createFaithfulnessEvaluator({
  model: openai("gpt-4o-mini"),
});

const result = await faithfulness.evaluate({
  input: "What is the capital of France?",
  context: "France is a country in Europe. Paris is its capital city.",
  output: "The capital of France is Paris.",
});
```

## Built-In Evaluator Factories

* `createConcisenessEvaluator`
* `createCorrectnessEvaluator`
* `createDocumentRelevanceEvaluator`
* `createFaithfulnessEvaluator`
* `createRefusalEvaluator`
* `createClassificationEvaluator`
* `createToolSelectionEvaluator`
* `createToolInvocationEvaluator`
* `createToolResponseHandlingEvaluator`

```ts theme={null}
import { openai } from "@ai-sdk/openai";
import {
  createCorrectnessEvaluator,
  createRefusalEvaluator,
} from "@arizeai/phoenix-evals";

const model = openai("gpt-4o-mini");

const correctness = createCorrectnessEvaluator({ model });
const refusal = createRefusalEvaluator({ model });
```

<section className="hidden" data-agent-context="source-map" aria-label="Source map">
  <h2>Source Map</h2>

  <ul>
    <li><code>src/llm/createClassificationEvaluator.ts</code></li>
    <li><code>src/llm/ClassificationEvaluator.ts</code></li>
    <li><code>src/llm/LLMEvaluator.ts</code></li>
    <li><code>src/llm/createFaithfulnessEvaluator.ts</code></li>
    <li><code>src/types/evals.ts</code></li>
  </ul>
</section>