Why it matters

Model provider swap is common need. Understanding shapes portable architecture.

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The architecture

Model abstraction layer.

Provider-specific implementations.

Config to switch providers.

Model portabilityModel interfaceabstractionProvider implsGemini/Claude/GPTConfig selectsat runtimeLangChain-style abstraction lets you swap providers with config change
Portability pattern.
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How it works end to end

Interface: send messages + tools; get response.

Provider quirks: function calling formats differ.

Test: eval on multiple providers.

Fallback: try alt provider on primary failure.