AIHacker Noonabout 4 hours ago
OpenAI Responses API vs Chat Completions for Agents
5 min read
OpenAI's Responses API (POST /v1/responses) unifies text, reasoning, tool calls, and structured results, unlike Chat Completions' message-based approach. It uses previous_response_id to reference prior context, reducing client-side history management. Previous input tokens in the response chain are still billed as input tokens.
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