AIUS runs a fixed set of models through your AIUS account. You never need a key from a model provider. Type /models to choose. Pareto, the default, routes each request to a suitable model.
The Select model list in the AIUS terminal: Pareto (recommended), Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, GPT-6 Astra, GPT-6 Luna and GPT-6.1 Sol

The model picker

To start with a model: aius --model aius/opus-5.5.

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Who pays

Model requests are billed to the organisation you work in: your personal organisation, the one AIUS creates with your account, until you switch. To work in another organisation, type /organisation, pick it and choose Switch to this organisation, or run aius platform organisation <id>. The choice belongs to your account, so the web and your other terminals follow it.
The Model organisation list in the AIUS terminal: Personal (ana.lopez), marked Default, and AIUS Examples, each with its ID

Choosing the organisation that pays for model requests

The terminal shows the session’s running cost below the prompt. An organisation’s owner can cap its spending with a shared budget; aius platform credits shows the recorded budgets. When the organisation’s budget is used up, the terminal says which organisation and what to do: its owners and admins get a link to its page to raise the budget or buy credit, and members are told to ask its owner or switch organisation with /organisation. If AIUS’s models are unavailable for a while, the terminal says so; try again later. If the model provider’s moderation flags a request, the terminal says so and nothing is charged; rephrase it, or choose another model with /models. None of these is a problem to report.