Tech Companies Tech Brief By HackerNoon

OpenAI Responses API vs Chat Completions: What Changes for Agents?

August 6, 2026·4 min
Episode Description from the Publisher

This story was originally published on HackerNoon at: https://hackernoon.com/openai-responses-api-vs-chat-completions-what-changes-for-agents. In the era of GPT-3.5 and GPT-4, this endpoint was practically synonymous with the OpenAI API. Check more stories related to tech-companies at: https://hackernoon.com/c/tech-companies. You can also check exclusive content about #openai, #owlvigil, #openai-responses-api, #chat-completions, #responses-api, #ai-agent-workflows, #openai-api, #agent-orchestration, and more. This story was written by: @jaketao. Learn more about this writer by checking @jaketao's about page, and for more stories, please visit hackernoon.com. In the era of GPT-3.5 and GPT-4, this endpoint was practically synonymous with the OpenAI API. Developers would pass in a set of messages, and the model would generate the next response based on the context.

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