# LumeGates > The most reliable AI model gateway for developers. ## Docs - [Chat Completions](https://docs.lumegates.com/api-reference/endpoint/chat.md) - [Error Handling](https://docs.lumegates.com/api-reference/errors.md): Common API error codes and solutions. - [API Overview](https://docs.lumegates.com/api-reference/introduction.md): Authentication and base URL information. ## OpenAPI Specs - [openapi](https://docs.lumegates.com/api-reference/openapi.json) ## Optional - [Model Square](https://lumegates.com/pricing)