Window AI takes the position that the model choice should belong to the user, not the website. You install the extension, add the providers you already pay for or run locally, and from then on any compatible site can ask for permission to send a prompt to the model you picked. The extension shows you the request and lets you approve or deny it, which keeps a visible record of where your text is going.
For end users the appeal is portability: set up a local Llama or GPT4All runtime, a Claude key and a GPT-4 key once, and switch between them everywhere. For developers the appeal is different. Instead of paying for and rate-limiting a shared API key, an app can ask the user's browser for a model, which removes a large part of the backend cost and lets users try an app for free with their own credentials. Supported text models at release included GPT-3.5 and GPT-4, PaLM 2 Chat and Code Chat, Claude and Claude Instant, Together's GPT-NeoXT-20B and Cohere Xlarge, plus the open local runtimes, with OpenAI's Shape-E covering early text-to-3D generation.
The extension is free and carries no subscription. Its published build dates from July 2023, so it sits in the early wave of model-agnostic tooling rather than at the cutting edge of today's model landscape; the provider list reflects that era. It remains installable and useful, particularly as an illustration of the bring-your-own-model pattern that later appeared in many AI developer platforms.
