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Atty Eleti Profile picture
Atty Eleti
@athyuttamre
voice @openai
Mar 11, 2025 • 16 tweets • 6 min read
Introducing the Responses API: the new primitive of the OpenAI API.

It is the culmination of 2 years of learnings designing the OpenAI API, and the foundation of our next chapter of building agents.

🧵Here’s the story of how we designed it: But first, a trip down memory lane: two years ago, we launched Chat Completions alongside GPT-3.5 Turbo. @_rlys and I built it over a weekend (literally): it was designed on a Friday, and GA’d on Tuesday.

Today, it is the de-facto industry standard, powering hundreds of thousands of apps, and adopted by every major model provider.Behind-the-scenes at the GPT-3.5 Turbo and Chat Completions launch.