Chris Messina

OpenAI Responses API and Agents SDK - New tools for building agents and tools

A new set of APIs and tools specifically designed to simplify the development of agentic applications.

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Chris Messina
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New in this update:


1. Responses API

Replaces the need to stitch together multiple APIs manually. Supports multi-turn interactions and multiple tool calls in one request. Includes built-in tools: Web Search, File Search, and Computer Use.


2. Agents SDK (formerly Swarm):

Helps orchestrate multiple agents with handoffs. Auto-generates JSON schemas for function calling from Python functions. Built-in tracing and monitoring tools for debugging. Open-source and soon available for JavaScript.


3. Assistance API sunset in 2026:

Developers will have time to migrate to Responses API. Responses API is a superset of chat completions and assistants.

Roverd Rammen

@chrismessina I think "function calling" is no longer the right term. It seems they updated it to "tool calling", which makes more sense in my opinion.

Chris Messina

@roverdrammen are you referring to #2?

Rick Fan

A very crucial update, will be integrated with the latest API and SDK as soon as possible.

Tanmay Parekh

New tools for developers!

Dwain Browne

This is amazing news!! Definitely going to try this out. I especially love the tracing feature.

Muhammad Saqib

excellent services

Kelvin Ikhide

Lovely update... I am building a simple product with it as we speak, should be ready within the next few days.