The interactions (NextGen) interface is incompatible with the Vertex AI Express mode (API Key authentication).
When using Express mode, the client initializer enforces a mutual exclusion between the API key and the project/location parameters. Because the project and location are missing, the SDK fails to construct the required Vertex AI resource path (/v1beta1/projects/{project}/locations/{location}/interactions). Instead, it falls back to a default path (/v1beta1/interactions) on the Gemini Developer API server, which does not exist and results in a 404 Not Found error.
To use the interactions interface, you must use the standard GCP Credentials authentication mode by providing a project, location, and valid Google Cloud credentials.
good catch, this looks like a real gap between express mode and the interactions endpoint. worth filing it as a bug on the vertex ai sdk repo so its tracked: Issues · googleapis/python-aiplatform · GitHub. for now the workaround you found, standard gcp credentials with project and location, is the right move until express mode support is added.
Apologies for the slow response, I was double checking this internally. The answer right now is that Vertex doesn’t fully support the Interactions API, but that should change soon.
Hi all, I’m Elaine on the Vertex Gemini API product team. Excited to see the demand for us to bring the base models to the Interactions API on Vertex. We currently support a few long running agents and models on the Interactions API: Interactions API | Gemini Enterprise Agent Platform | Google Cloud Documentation. We anticipate that the 3.5 and 3.6 Gemini models will be available publicly in early September.
Hey @elaine, I am hoping 3.5 and 3.6 Gemini are on track to be released on the Interactions API on Vertex, as you say. I do not have access to AI Studio, and I have to build on Vertex AI.
We are on track to release the 3.5 Flash Lite and 3.6 Flash models on the Interactions API on Vertex AI in September. If you have a Google Cloud point of contact you may be able to ask them to request early access for you. Thanks!