OpenRouter is a single gateway to AI models: instead of creating separate accounts and getting keys for OpenAI, Anthropic, Google, DeepSeek and dozens of other companies, you reach hundreds of models with one account and one API key. Its API is compatible with the OpenAI format, so most libraries and tools connect to it without code changes. If a model's provider goes down, it automatically routes the request to another provider. Its main difference from going to each company's API is this unification and the ability to compare and swap models quickly.

What is OpenRouter good for?#

  • Comparing models for a project: a WordPress plugin developer tries one prompt on several models to find the best quality-to-cost ratio for writing product descriptions.
  • Cutting cost: simple jobs go to a cheap model and hard jobs to a strong one, without keeping several separate accounts.
  • Starting free: a student uses its free models for a course project.
  • Connecting coding tools: you connect coding agents and editor extensions to the model of your choice.
  • Service resilience: if one provider goes down, a site's support bot keeps working with a fallback model.

Strengths and weaknesses#

Strengths:

  • One account, one key and one bill for all models.
  • OpenAI API compatibility; migration is very simple.
  • Free models for testing and detailed usage reporting.
  • Fast access to new models, open and closed.

Weaknesses:

  • An extra middleman between you and the provider; your data passes through its servers.
  • The fee on credit purchases makes cost slightly higher than a direct API.
  • Free models have request caps, and your data may be used to improve models.
  • A model's behavior may differ slightly depending on the provider the request lands on.

Free tier and pricing#

OpenRouter has no monthly subscription; you buy credits and pay per use for each model. A number of free models with daily request caps are also available. A small fee is charged on credit purchases. Check the official site for current pricing.

Language support#

Quality in any language depends on the model you choose; since the strong models from major companies are available, you can pick the best one for your language. Never put an API key in client-side code or a public repository.

Getting started in three steps#

  1. Create an account and set up an API key with a defined spending limit.
  2. In your code or tool, change the base URL to OpenRouter and the model name to one from its list.
  3. Test with a free model, then choose the right model for real work.

OpenRouter alternatives#

  • Hugging Face: for access to open models and running them through connected providers.
  • Ollama: running models on your own machine, with no usage cost and no data sent out.
  • ChatGPT and Claude: if you only need one company's models, their direct APIs have fewer intermediaries.

To start programming with it, read your first AI API connection with PHP: keys, cost and common errors and calculating and reducing AI API cost.