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

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!

Hodor Wang

That's wonderful! I can't wait to try developing my own agent with this.

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.