Preventing LLM vendor lock-in usually comes down to keeping your architecture provider-agnostic.

A few practical approaches help:

• Abstract the model layer using APIs or orchestration frameworks so your application logic doesn’t depend on a specific provider.
• Use open standards and formats for prompts, embeddings, and outputs.
• Separate model logic from business logic so swapping models does not break the application.
• Test across multiple models (OpenAI, Anthropic, open-source models) to avoid relying on a single ecosystem.

In practice, teams that treat LLMs as replaceable infrastructure components rather than core dependencies find it much easier to switch providers when costs, policies, or performance change.