Is your AI Hallucinating?

Reprompt API automatically finds bad AI responses without building an entire eval pipeline.

Try it out on our Copilot

Evaluate with one API call

Integrating Reprompt is easy. In less than an hour you can be collecting datasets, testing new prompts, and writing custom rules

  • Send your full system prompt and response to the API
  • Checks for hallucinations, non-answers, and generally poor responses
  • Logged and easily searchable
# Python
import requests

response =
    "Content-Type": "application/json",
    "apiKey": "<YOUR-REPROMPT-API-KEY>"
    "prompt": "<The full chat history or system prompt including RAG context and user input used to generate the response>",
    "response": "<Your AI's Response>",

result = response.json() # {isHallucinated: bool, isBadResponse: bool, reasoning: string}

Frequently Asked Questions

Backed by top VCs including Y Combinator, Rebel Fund, and the founders of Reddit, Cruise, Color and Instacart.

Backed by Y Combinator

Sound interesting? Let's talk

We're RAG and agent experts, building the tools we wanted when we started working with LLMs. If you're building with AI and running into issues, we'd love to chat.