AI Gateway Pattern Lets Developers Use One Key for Claude, GPT, and Gemini

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Managing multiple AI model providers typically requires separate API keys, SDKs, and billing accounts for each, adding complexity unrelated to the core product. The AI gateway pattern solves this by routing all requests through a single OpenAI-compatible endpoint using one credential, regardless of the target model. On Neon's serverless platform, enabling the gateway via a config flag automatically injects the required token and base URL into the deployed function, eliminating manual key management. A developer tested the setup by sending identical chat requests through a single handler to GPT, Claude, and Gemini, all returning correct responses with the same code. One noted compatibility issue is that GPT-5 models require the max_completion_tokens parameter, while other providers use max_tokens.

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