---
title: "Execute perplexity evaluator"
method: POST
path: "/v2/evaluators/perplexity/execute"
tags: ["evaluators"]
---

# Execute perplexity evaluator

`POST /v2/evaluators/perplexity/execute`

Measure text perplexity from logprobs

**Request Body:**
- `input.logprobs` (string, required): JSON array of log probabilities from the model

## Request body

- RequestPerplexityRequest
  - `input` RequestPerplexityInput, required
    - `logprobs` string, required

## Response `200`

OK

- ResponsePerplexityResponse
  - `perplexity_score` number

## Other responses

- `400` — Bad Request
- `500` — Internal Server Error

---

[API](https://skmtc.net/traceloop/apis/traceloop-api.md) · [All operations](https://skmtc.net/traceloop/apis/traceloop-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/traceloop/traceloop-api/versions/9c12a04a5947/schema)