What it does

LazySusan API gives access to chat, image and video models through one key, one SDK and one bill. The listed models include GPT-6, Claude, Gemini, Grok, FLUX, Nano Banana and Veo. Install the SDK with npm install lazysusan or pip install lazysusan. Create an account in the console, add credits and create a key. The key is shown only once. The JavaScript client reads the key from LAZYSUSAN_API_KEY. Chat calls use ls.chat.create. Image generation uses ls.images.generate. Each call names a model, such as anthropic/claude-sonnet-5-5 or google/nano-banana-2.1. Switching models means changing the model name. The rest of the code stays the same. Chat replies include usage cost in credits through reply.usage.costCredits.

Capabilities

Each developer and service can have its own key, with roles, monthly budgets and allowed models.
The console shows who uses what.
A monthly budget can be set on a key, on a teammate covering all their keys, or on the whole account.
A request that would go over a budget is refused before it runs.
Before a request runs, LazySusan reserves the most it could cost, then charges only what was used and releases the rest straight away.
A request that fails costs nothing.
A request the balance cannot cover is refused with a 402 before anything runs. Auto top-up can be turned on.
Teammates are added in the console by entering their email addresses with a role. Each person receives a one-click link.

When to use it

You want to switch between AI models by changing only the model name in your code.
You want each developer and service to have its own key.
You want to cap spend per person or per key so a runaway script stops at the limit.