Put a small, application-owned interface between your business logic and each AI provider. Implement provider-specific adapters behind it to translate requests, responses, tool calls, and stream events. This makes provider changes manageable—not automatic: schemas and capabilities do not map perfectly across services, so the app must detect and test those differences.
What the provider boundary should do
Your application should depend on its own request and result types, not on a vendor SDK’s types. Keep the contract small enough to represent the operations your app actually needs, while making unsupported features visible rather than silently dropping them.
Define an internal request and result
A request might contain normalized messages, the desired output mode, tool definitions, and only the generation options the application uses. A result might contain text or structured content, tool-call intents, a finish status, usage when available, and provider and model metadata. These are design choices, not a universal standard; shape them around your app’s requirements.
Put provider-specific translation in adapters
Give each provider or API route an adapter that converts your internal request into the provider’s format and converts its response and stream events back. Each adapter should report whether a capability is supported, supported with limitations, or unsupported. Keep provider-specific options available through a deliberate extension point when you need them; do not imply those options work everywhere.
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Keep tool execution under application control
For application-owned tools, normalize a provider’s tool-call representation into an intent, validate its arguments, execute it using your application’s authorization rules, and return the result in your internal format. Anthropic’s documented tool-use cycle has the application define client-tool schemas and execute those tools; Anthropic-hosted server tools follow a different execution and usage path. Anthropic tool-use documentation describes that distinction.
Normalize errors without losing diagnostics
Map common failures into internal categories your application can handle, but retain provider-specific details in logs. Preserve provider and model identity and usage metadata when available. Do not assume every adapter reports the same telemetry or that every failure has an equivalent on another provider. OpenAI’s Agents SDK model documentation notes differences in provider support for tools, multimodal inputs, structured outputs, streaming, and usage.
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Choose the integration route based on required features
The right route depends on which capabilities your app needs and how much provider-specific access you require. Google recommends its GenAI SDK for Gemini end-user applications and describes direct API integration and OpenAI compatibility as alternatives for different needs.
| Integration route | Good fit | Trade-off |
|---|---|---|
| Provider’s official SDK | An end-user application that needs provider features and SDK helpers. Google recommends its GenAI SDK for Gemini end-user applications. | You take on SDK dependencies and versioning, and provider-specific concepts remain in the integration. |
| Direct REST or gRPC | A framework, gateway, or integration layer that needs precise dependency control or access to provider API features. | You handle more request validation, typing, and authentication work yourself. |
| OpenAI-compatible endpoint | An existing OpenAI-client workflow using features supported by the compatibility layer. For supported Gemini workflows, Google says setup can be as simple as changing the base URL and key. | Compatibility has a feature ceiling: schemas do not map one-to-one, and some native provider features need a separate path. |
| Multi-provider SDK or adapter layer | Your required providers or routing needs are not covered by built-in integration points. | You add another compatibility layer whose support and semantics depend on the adapter and backend. OpenAI describes its Any-LLM and LiteLLM integrations as best-effort beta integrations in its reviewed documentation. |
Google’s Gemini API partner and library guidance compares SDK, direct API, and OpenAI-compatible routes. It warns that the OpenAI schema does not map one-to-one to Gemini and recommends direct integration when full Gemini feature access is required. Its practical advice is: “If you need a significant amount of special-casing, it may be more value to use a dedicated SDK or API for each platform.”
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Build the abstraction around capabilities, not a lowest common denominator
Start by listing the operations your app needs, such as text generation, streaming, tool use, constrained output, image or audio input, embeddings, or provider-hosted tools. Declare support for the relevant capabilities in each adapter. When an operation is unavailable, fail clearly or choose an intentional fallback; do not quietly pretend that two providers behave identically.
A broad abstraction can become counterproductive if it either hides useful features or expands until it mirrors every vendor API. For a provider-specific feature, expose a named extension or route that operation through a native adapter. Google’s compatibility guidance is explicit that some features need native APIs or additional handling. The OpenAI Agents SDK documentation likewise describes integration points at global, per-run, and per-agent scope while cautioning that support varies by provider.
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Implement the seam before adding another provider
- Inventory what the application actually uses. Record each operation and its requirements: message formats, tools, streaming, structured output, images or audio, embeddings, and any provider-hosted tools.
- Define your internal request and result types. Keep vendor SDK objects out of business logic and persistence formats. Include only the portable concepts your app needs, plus explicit fields or extensions for provider-specific options.
- Move the current provider behind an adapter. This establishes the boundary against a real integration and helps avoid designing a premature universal API.
- Add the next provider and document capability differences. For each required feature, record whether it is supported, mapped with limitations, or unsupported. Use the provider’s native SDK or API when a compatibility layer cannot preserve required behavior.
- Test the actual provider and model route. Write contract tests for message mapping, tool arguments and results, stream events and completion, structured-output validation, usage fields, and provider-specific failures. OpenAI’s SDK guidance notes that some providers do not support JSON-schema output and some compatible providers report incremental tool-call deltas unreliably.
- Roll out through configuration with a rollback path. Keep provider and model selection out of scattered business logic. Monitor the selected route and retain a way to revert a change. OpenAI’s Agents SDK guidance recommends explicit model selection in production rather than relying on an SDK default.
What provider switching does—and does not—buy you
This architecture reduces how much business logic depends on a particular provider’s request and response formats. It does not guarantee identical outputs, feature parity, or a one-click migration. A switch still requires checking the target route’s capabilities, validating its behavior with your tests, and deciding how the application should handle features that do not translate.
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