PostHog Integration - Helicone OSS LLM Observability

Warning

This integration method is maintained but no longer actively developed. For the best experience and latest features, use our new AI Gateway with unified API access to 100+ models.

How to Integrate Helicone with PostHog#

Create an account for PostHog here.

Add two new headers

Similar to how you set Helicone-Auth header, add two new headers Helicone-Posthog-Key and Helicone-Posthog-Host with your API key and PostHog host.

Tip

You can find both your API key and PostHog host in your PostHog project settings.

client = OpenAI(	api_key="<your-api-key-here>", # Replace with your OpenAI API key	base_url="https://oai.helicone.ai/v1" # Set the API endpoint	default_headers= {		"Helicone-Auth": f"Bearer {HELICONE_API_KEY}",		"Helicone-Posthog-Key": "<ph_project_api_key>",		"Helicone-Posthog-Host": "<ph_client_api_host>", # (Optional)	})

import { Configuration, OpenAIApi } from "openai";const configuration = new Configuration({apiKey: process.env.OPENAI_API_KEY,basePath: "https://oai.helicone.ai/v1",baseOptions: {	headers: {		"Helicone-Auth": `Bearer ${process.env.HELICONE_API_KEY}`,		"Helicone-Posthog-Key": "<ph_project_api_key>",		"Helicone-Posthog-Host": "<ph_client_api_host>",	},},});const openai = new OpenAIApi(configuration);

curl --request POST \	--url https://oai.helicone.ai/v1/chat/completions \	--header "Authorization: Bearer $OPENAI_API_KEY" \	--header "Content-Type: application/json" \	--header "Helicone-Posthog-Key: Bearer $POSTHOG_PROJECT_API_KEY" \	--header "Helicone-Posthog-Host: Bearer $POSTHOG_CLIENT_API_HOST" \	--header "Helicone-Auth: Bearer $HELICONE_API_KEY" \	--data '{		"model": "gpt-4o-mini",		"messages": [			{				"role": "system",				"content": "Say Hello!"			}		],		"temperature": 1,		"max_tokens": 30	}'

Helicone events will now be exported into PostHog as soon as they're available.

Create a dashboard in PostHog

Create your own dashboard, or use our template to start.

Go to the dashboard tab in PostHog.
Click the New dashboard button in the top right.
Select LLM metrics – Helicone from the list of templates, or Blank dashboard to start from scratch.