Sep 12, 2025 · OpenAI Developer BlogHow the Responses API unlocks persistent reasoning, hosted tools, and multimodal workflows for GPT-5.

Oct 21, 2025 · Stay up to speed on the rapid advancement of AI technology and the benefits it offers to humanity.

Aug 26, 2025 · How we think about safety for users experiencing mental or emotional distress, the limits of today’s systems, and the work underway to refine them.

Sep 11, 2025 · This blog is for OpenAI developers. Anyone developing with the OpenAI platform—the API, our models, or our other developer tools—is encouraged to follow along.

May 13, 2024 · Introducing GPT-4o and more tools to ChatGPT free users We are launching our newest flagship model and making more capabilities available for free in ChatGPT.

Feb 27, 2025 · We’re releasing a research preview of GPT‑4.5—our largest and best model for chat yet. GPT‑4.5 is a step forward in scaling up pre-training and post-training.

Sep 22, 2025 · When we released o1-preview late last year, our Chief Scientist Jakub Pachocki wrote this in our blog: We believe that a hidden chain of thought presents a unique opportunity …

Jan 25, 2024 · We are launching a new generation of embedding models, new GPT-4 Turbo and moderation models, new API usage management tools, and soon, lower pricing on GPT-3.5 …

Sep 2, 2025 · Routing sensitive conversations to reasoning models and rolling out Parental Controls within the next month.

Sep 12, 2024 · Introducing OpenAI o1As part of developing these new models, we have come up with a new safety training approach that harnesses their reasoning capabilities to make them …