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Helicone

Observability · Freemium

Open-source AI gateway and LLM observability platform for logging, tracing, routing, evaluation, caching, and cost monitoring across model providers and agent stacks.

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Portkey

Observability· portkey.ai

Freemium

AI gateway and observability layer for routing, guardrails, caching, logging, and spend control across LLM providers behind one API.

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Traceloop OpenLLMetry

Observability· traceloop.com

Open source

OpenTelemetry-based open-source instrumentation for tracing, monitoring, and debugging LLM applications across frameworks and providers.

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Observability· evidentlyai.com

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Open-source observability and evaluation framework for monitoring ML and LLM applications with tests and metrics.

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Laminar

Observability· laminar.sh

Freemium

Open-source observability, tracing, and evaluation platform built for AI agents.

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Start building with Helicone
TypeScript

Detected in linked setup sources

Paste into a fresh file and run with node / ts-node / bun.

typescript
import OpenAI from "openai";

   const client = new OpenAI({
     baseURL: "https://ai-gateway.helicone.ai",
     apiKey: process.env.HELICONE_API_KEY,
   });

   const response = await client.chat.completions.create({
     model: "gpt-4o-mini",  // claude-sonnet-4, gemini-2.0-flash or any model from https://www.helicone.ai/models
     messages: [{ role: "user", content: "Hello!" }]
   });
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