OpenAI· GPT / ChatGPT / APINew model

OpenAI GPT-4.5 System Card

OpenAI releases a research preview of GPT-4.5, described as its largest and most knowledgeable model.

From the source

We’re releasing a research preview of OpenAI GPT‑4.5, our largest and most knowledgeable model yet.

openai.com

Announced

27 Feb 2025 12:00 UTC

Detected

03 Aug 2026 21:11 UTC (+522d after)