The ability to build portable, provider-agnostic AI applications is the future of agentic development. For the past few years, OpenAI’s Chat Completion API has been considered the de facto standard for interacting with LLMs. Major model providers, open source serving platforms, and AI gateways supported this standard. While this API served well during the stateless chatbot era, it falls short of many capabilities that agents expect.
OpenAI officially transitioned from Chat Completion API to Responses API in March 2025. Compared to the…

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