Models Choosing a model If you're not sure where to start, use GPT-5.5, our flagship model for complex reasoning and coding. If you're optimizing for latency and cost, choose a smaller variant like GPT-5.4 …

All models Browse all available models and compare their capabilities.

Advanced open-weight reasoning models to customize for any use case and run anywhere.

We believe our research will eventually lead to artificial general intelligence, a system that can solve human-level problems. Building safe and beneficial AGI is our mission.

Some models that are deprecated for ChatGPT sign-in may still be available in the API. If your workflow depends on one of those models, use API-key authentication and check the API models page for …

Nov 30, 2022 · We’ve trained a model called ChatGPT which interacts in a conversational way. The dialogue format makes it possible for ChatGPT to answer followup questions, admit its mistakes, …

Aug 5, 2025 · 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 …

May 7, 2026 · We expect to continue to accelerate defenders with various models, including both our flagship models through Trusted Access for Cyber, and with dedicated cyber models like …

Dec 11, 2025 · GPT-5.2 is our most advanced frontier model for everyday professional work, with state-of-the-art reasoning, long-context understanding, coding, and vision. Use it in ChatGPT and the …

Apr 23, 2026 · Introducing GPT-5.5, our smartest model yet—faster, more capable, and built for complex tasks like coding, research, and data analysis across tools.