Simple One API is an open-source adapter that exposes many different large model platforms through a single OpenAI-compatible interface. Services such as Baidu Qianfan, iFlytek Spark, Tencent Hunyuan, MiniMax, and DeepSeek can all be reached through the same OpenAI-style endpoints, so existing tools and SDKs work with them unchanged. The project has earned more than 2,300 stars on GitHub and was still actively updated in September 2026.
Each model platform historically invented its own request format, authentication scheme, and streaming behavior, which made multi-provider applications tedious to build and maintain. Simple One API sits in the middle as a translation layer: clients send standard OpenAI-format requests, and the gateway converts them to the target platform’s native API and converts responses back. The entire gateway ships as a single executable file with deliberately simple configuration, so deployment is a one-step affair on a server, a NAS, or a developer laptop โ no framework, database, or container stack required. That minimalism is the point: it is a practical bridge for people who mainly use Chinese LLM platforms but want the enormous ecosystem of OpenAI-compatible clients.
Simple One API is completely free and open source under the MIT license. You only pay for usage on the underlying model platforms you connect, according to their own pricing.
Simple One API is for developers โ especially those working with Chinese LLM platforms โ who want one stable, OpenAI-shaped endpoint for all their providers. It is ideal for tinkerers and small teams who value a five-minute setup over a heavyweight gateway platform.