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---
sidebar_label: Helicone
description: 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](https://helicone.ai/) 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](https://www.helicone.ai) or create an account. Once you have an account, you can generate an [API key](https://helicone.ai/developer).
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:
```yaml
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](https://docs.helicone.ai/features/prompts#prompts-and-experiments) to create a Prompt using Helicone