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Helicone Monitor and optimize LLM testing with Helicone integration in Promptfoo. Track usage, costs, and latency while managing prompts through an open-source observability platform.

Helicone integration

Helicone is an open source observability platform that proxies your LLM requests and provides key insights into your usage, spend, latency and more.

To reference prompts in Helicone:

  1. Log into Helicone or create an account. Once you have an account, you can generate an API key.

  2. Set the HELICONE_API_KEY and environment variables as desired.

  3. Use the helicone:// prefix for your prompts, followed by the Helicone prompt id and version. For example:

    prompts:
      - 'helicone://my-cool-prompt:5.2'
    
    providers:
      - openai:gpt-5-mini
    
    tests:
      - vars:
          # ...
    

Variables from your promptfoo test cases will be automatically plugged into the Helicone prompt as variables.

You can follow this guide to create a Prompt using Helicone