Q: How do I use multiple LLM providers without juggling accounts?

Two tools solve this, in two different ways.

OpenRouter is a managed gateway. You create one account, get one API key, and route your requests to almost any model on the market: GPT, Claude, Gemini, Llama, Mistral, and hundreds more, including some free ones. One bill, one key in your environment file, and switching models means changing one string in your code. Pricing is essentially the same as going to each provider directly.

LiteLLM solves the same problem as a library you run yourself: it translates the OpenAI API format to every provider, so your code stays identical while the provider changes underneath. Gateway versus library. Same goal, pick by whether you want a managed service or your own code.