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Measuring the Responses API on Alan’s Support AI agents

calendar_today June 23, 2026 person Shion Honda domain alan-com

In 2025, OpenAI introduced a new way to call its models: the Responses API . Their pitch is that switching from the legacy Chat Completions API to the Responses API makes reasoning models work better. OpenAI’s own reported number is a 5% lift on Tau-bench retail .

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