Nova Act model version selection
The Nova Act service relies on a custom foundation model, specially trained for UI-forward applications such as browser automation, tool use, and Human-in-the-Loop.
We release models under two support levels:
-
General Availability (GA) - Stable releases for production applications, supported for at least 1 year.
-
Preview - Preview releases that give you an opportunity to try out new functionality and model performance.
There are two approaches for selecting the model version for your workflow:
-
Automatically track to the latest version
-
Select the
nova-act-latestalias to automatically use the latest GA model version. -
Select the
nova-act-previewalias to automatically use the latest preview model.
-
-
Pin to a specific model version - Select a specific model version that will be supported for at least 1 year.
Note
nova-act-latest only tracks GA models and will never automatically update to a preview model.
Available model selection IDs
| Model-Id | Description |
|---|---|
|
|
Alias to the latest GA model. Your workflows automatically track the latest GA model that your Nova Act SDK version supports. |
|
|
Alias to the latest preview model. Your workflow automatically tracks the latest preview model that your Nova Act SDK supports. Note: If the latest preview model requires a newer SDK version than you’re using, you’ll get the most recent GA model that your SDK supports, along with a warning message. |
|
|
The GA model released on December 2, 2025. This is the first example of a pinable model selection ID. |
Note
At launch (December 2, 2025), all three model IDs point to the same v1.0 model. The aliases automatically track newer versions as they become available.
Model Selection Options
Specify the model version using the
model_id
parameter in your workflow definition. The following example uses
model_id="nova-act-latest"
:
from nova_act import NovaAct, workflow @workflow(workflow_definition_name="<your-workflow-name-here>", model_id="nova-act-latest") def explore_travel_destinations(): """Explore travel destinations.""" with NovaAct(starting_page="https://nova.amazon.com/act/gym") as nova: nova.act("Click on NextDot, then explore possible destinations.")
