Manual Capture

curl -X POST "https://us.i.posthog.com/i/v0/e/" \
        -H "Content-Type: application/json" \
        -d '{
            "api_key": "<ph_project_token>",
            "event": "$ai_generation",
            "properties": {
                "distinct_id": "user_123",
                "$ai_trace_id": "trace_id_here",
                "$ai_model": "gpt-5-mini",
                "$ai_provider": "openai",
                "$ai_input": [{"role": "user", "content": "Tell me a fun fact about hedgehogs"}],
                "$ai_input_tokens": 10,
                "$ai_output_choices": [{"role": "assistant", "content": "Hedgehogs have around 5,000 to 7,000 spines on their backs!"}],
                "$ai_output_tokens": 20,
                "$ai_latency": 1.5,
                "$ai_stream": true,
                "$ai_time_to_first_token": 0.25
            }
        }'

npm install posthog-node

import { PostHog } from 'posthog-node'
const client = new PostHog('<ph_project_token>', {
    host: 'https://us.i.posthog.com'
})

// After your LLM call
client.capture({
    distinctId: 'user_123',
    event: '$ai_generation',
    properties: {
        $ai_trace_id: 'trace_id_here',
        $ai_model: 'gpt-5-mini',
        $ai_provider: 'openai',
        $ai_input: [{ role: 'user', content: 'Tell me a fun fact about hedgehogs' }],
        $ai_input_tokens: 10,
        $ai_output_choices: [{ role: 'assistant', content: 'Hedgehogs have around 5,000 to 7,000 spines on their backs!' }],
        $ai_output_tokens: 20,
        $ai_latency: 1.5,
        // For streaming responses, also include:
        // $ai_stream: true,
        // $ai_time_to_first_token: 0.25
    }
})
client.shutdown()

pip install posthog

from posthog import Posthog
posthog = Posthog("<ph_project_token>", host="https://us.i.posthog.com")

# After your LLM call
posthog.capture(
    distinct_id='user_123',
    event='$ai_generation',
    properties={
        '$ai_trace_id': 'trace_id_here',
        '$ai_model': 'gpt-5-mini',
        '$ai_provider': 'openai',
        '$ai_input': [{'role': 'user', 'content': 'Tell me a fun fact about hedgehogs'}],
        '$ai_input_tokens': 10,
        '$ai_output_choices': [{'role': 'assistant', 'content': 'Hedgehogs have around 5,000 to 7,000 spines on their backs!'}],
        '$ai_output_tokens': 20,
        '$ai_latency': 1.5,
        # For streaming responses, also include:
        # '$ai_stream': True,
        # '$ai_time_to_first_token': 0.25
    }
)

go get github.com/posthog/posthog-go

import "github.com/posthog/posthog-go"
client, _ := posthog.NewWithConfig("<ph_project_token>", posthog.Config{
    Endpoint: "https://us.i.posthog.com",
})
defer client.Close()

// After your LLM call
client.Enqueue(posthog.Capture{
    DistinctId: "user_123",
    Event:      "$ai_generation",
    Properties: map[string]interface{}{
        "$ai_trace_id":        "trace_id_here",
        "$ai_model":           "gpt-5-mini",
        "$ai_provider":        "openai",
        "$ai_input_tokens":    10,
        "$ai_output_tokens":   20,
        "$ai_latency":         1.5,
        // For streaming responses, also include:
        // "$ai_stream":              true,
        // "$ai_time_to_first_token": 0.25,
    },
})

gem install posthog-ruby

require 'posthog-ruby'
posthog = PostHog::Client.new({
    api_key: '<ph_project_token>',
    host: 'https://us.i.posthog.com'
})

# After your LLM call
posthog.capture({
    distinct_id: 'user_123',
    event: '$ai_generation',
    properties: {
    '$ai_trace_id' => 'trace_id_here',
    '$ai_model' => 'gpt-5-mini',
    '$ai_provider' => 'openai',
    '$ai_input_tokens' => 10,
    '$ai_output_tokens' => 20,
    '$ai_latency' => 1.5
    # For streaming responses, also include:
    # '$ai_stream' => true,
    # '$ai_time_to_first_token' => 0.25
    }
})

composer require posthog/posthog-php

<?php
require_once __DIR__ . '/vendor/autoload.php';
use PostHog\PostHog;
PostHog::init('<ph_project_token>', [
    'host' => 'https://us.i.posthog.com'
]);

// After your LLM call
PostHog::capture([
    'distinctId' => 'user_123',
    'event' => '$ai_generation',
    'properties' => [
        '$ai_trace_id' => 'trace_id_here',
        '$ai_model' => 'gpt-5-mini',
        '$ai_provider' => 'openai',
        '$ai_input_tokens' => 10,
        '$ai_output_tokens' => 20,
        '$ai_latency' => 1.5
        // For streaming responses, also include:
        // '$ai_stream' => true,
        // '$ai_time_to_first_token' => 0.25
    ]
]);