Heimdall

[Dec '25] Self host open LLMs + connect your ChatGPT Account

Open Source LLM Models

Comma separated list of models to download at boot start. Default is gemma3:270m

Allows Ollama to listen on all interfaces

Comma-separated list of allowed origins for CORS. Needed if you’re connecting a web app (like OpenWebUI) from a different host/domain

Allows the web UI to connect from any origin.

Points OpenWebUI to the internal Ollama API endpoint for model access.

Enter your OpenAI API Key to access all the OpenAI models inside Open WebUI"

Secret key used by OpenWebUI to secure sessions and authentication.