Models and settings
The AI Builder can run on different AI models. You choose which one, and you can change it at any time without losing your conversation. This page covers the model picker, the settings around it, and how usage is billed.
Choosing a model
Section titled “Choosing a model”A model picker sits next to the message box. It lists the available models grouped by provider, marks the current default, and shows a relative cost multiplier next to each one, so you can trade capability against cost with your eyes open.
Switching model mid-conversation is instant: the thread continues, now answered by the model you picked.
Available models
Section titled “Available models”| Provider | Model | Best for |
|---|---|---|
| Anthropic | Claude Opus 5.5 | The deepest reasoning, for the hardest problems. It is the default. |
| Anthropic | Claude Sonnet 5.5 | Fast and capable all-round building, at a lower cost. |
| Mistral | Mistral Medium 3.5 | A capable everyday model from a European provider. |
The picker is what makes this list true: it reads the catalogue your organization allows, at the moment you open it. Every plan, Free included, can use every model in it.
Settings and defaults
Section titled “Settings and defaults”Which models are available, and which one new conversations start with, is decided at three levels, each narrowing the one above it:
- Your organization decides which models it allows at all. See Organization settings.
- Your account picks your own preference inside that list, from your settings.
- Your project can standardize on one model, so a given app always uses it.
How usage is billed
Section titled “How usage is billed”AI usage is metered by tokens, the units of text a model reads and writes. That is why each model shows a cost multiplier: a heavier model spends credits faster than a lighter one for the same task. Picking the right model for the job is the simplest way to keep usage efficient.
Credits belong to your organization, not to you, and they refill with its billing cycle. The Usage page shows what has been spent and by whom. See Plans, usage & billing.