How to Route Any AI-Enabled App to a Local LLM on Your Mac
Most AI-powered apps use OpenAI's Chat Completions format as a standard, which makes it possible to swap cloud APIs for a locally running model without the app detecting any difference. Tools like Ollama and LM Studio run OpenAI-compatible servers on a Mac at localhost ports 11434 and 1234 respectively, accepting the same request and response structure. Users can redirect compatible apps simply by changing the base URL setting and entering any placeholder string as the API key. The same approach works across official OpenAI SDKs, JavaScript clients, and CLI tools by updating a single configuration field or environment variable. However, users should watch for limitations such as small default context windows, missing support for function calling or vision features, and potential streaming compatibility issues depending on the client and local model used.
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