beginnerSpring AI Setup & Hello World
Why does Spring AI provide `ChatClient` as an abstraction instead of exposing each provider's raw SDK directly?
`ChatClient` gives one consistent fluent API (`.prompt().user(...).call()`) across OpenAI, Anthropic, Ollama, and others, so switching providers or supporting multiple providers in one app doesn't mean rewriting business logic — only the underlying `ChatModel` bean configuration changes.
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