Large language models

Welcome GPT OSS, the new open-source model family from OpenAI!

gpt-oss-120b & gpt-oss-20b Model Card

We introduce gpt-oss-120b and gpt-oss-20b, two open-weight reasoning models available under the Apache 2. 0 license and our gpt-oss usage policy.

Introducing gpt-oss

We’re releasing gpt-oss-120b and gpt-oss-20b—two state-of-the-art open-weight language models that deliver strong real-world performance at low cost. Available under the flexible Apache 2.

Estimating worst case frontier risks of open weight LLMs

In this paper, we study the worst-case frontier risks of releasing gpt-oss. We introduce malicious fine-tuning (MFT), where we attempt to elicit maximum capabilities by fine-tuning gpt-oss to be as capable as possible in two domains: biology and cybersecurity.

Measuring Open-Source Llama Nemotron Models on DeepResearch Bench

What we’re optimizing ChatGPT for

We build ChatGPT to help you thrive in all the ways you want. Learn how we're improving support for tough moments, have rolled out reminders to take breaks, and are working on better life advice, all guided by expert input.

📚 3LM: A Benchmark for Arabic LLMs in STEM and Code

Unlocking the potential of vision language models on satellite imagery through fine-tuning

Announcing Codestral 25.08 and the Complete Mistral Coding Stack for Enterprise

Introducing study mode in ChatGPT

Introducing study mode in ChatGPT, a new learning experience that helps you work through problems step by step, guiding students with questions, scaffolding, and feedback for deeper learning.

Resolving digital threats 100x faster with OpenAI

Discover how Outtake uses GPT-4. 1 and OpenAI o3 to power AI agents that detect and resolve digital threats 100x faster than before.

OpenAI’s new economic analysis

Analysis provides insights into ChatGPT’s impact on the economy. OpenAI also launches new research collaboration to study AI’s broader effects on the labor market and productivity.

Accelerate a World of LLMs on Hugging Face with NVIDIA NIM

The Big LLM Architecture Comparison

From DeepSeek-V3 to Kimi K2: A Look At Modern LLM Architecture Design

Introducing ChatGPT agent

Introducing ChatGPT agent: it thinks and acts, using tools to complete tasks like research, bookings, and slideshows—all with your guidance.

ChatGPT agent System Card

ChatGPT agent System Card: OpenAI’s agentic model unites research, browser automation, and code tools with safeguards under the Preparedness Framework.

Consilium: When Multiple LLMs Collaborate

Invideo AI uses OpenAI models to create videos 10x faster

Invideo AI uses OpenAI’s GPT-4. 1, gpt-image-1, and text-to-speech models to transform creative ideas into professional videos in minutes.

Intellectual freedom by design

ChatGPT is designed to be useful, trustworthy, and adaptable—so you can make it your own.

Upskill your LLMs With Gradio MCP Servers