Gemini & Vertex AI — fully supported
Mnemosyne OS is 100% compatible with Google's model stack — both doors: the Gemini API (Google AI, one key and you're in) and Vertex AI (the Google Cloud enterprise route). They're not an afterthought; several of the OS's abilities run best — or only — on them.
What runs on these routes
-
Thinking — the model pill offers four Google-powered brains out of the box: Google · reasoning, Google · fast, Vertex · reasoning, Vertex · fast — switchable per message, mid-conversation, with the price in plain sight.

-
The zero-config start is Gemini — the sponsored free-credits route itself reasons on Gemini (Flash-Lite). The easiest way into Mnemosyne OS is already Google-powered.
-
Video understanding — analyzing a video clip in chat requires a Gemini or Vertex route: it's the door that unlocks full multimodality.

-
Cloud semantic memory — if you choose the cloud or hybrid route for the cognitive engine, Vertex embeddings are among the engines that can power semantic recall.
Bring your own Google
In Settings → Intelligence (or during onboarding), pick Google AI and paste your Gemini API key — encrypted on your machine — or pick Vertex AI to route through your own Google Cloud project.

Why Vertex matters if you're an organization: the calls run through your GCP project — your billing, your region, your data-governance controls. And either way, the memory itself never moves: vaults, chronicles and indices stay on your machine; only the reasoning requests travel on the route you chose.
Mnemosyne OS is an independent product. It is not affiliated with or endorsed by Google, Google DeepMind or Google Cloud — it speaks their APIs fluently, which is exactly what you want from a sovereign tool.