FrontierThe story, in brief
Introducing GPT-4.5
OpenAI just shipped GPT-4.5. Here's what changed in scaling.
The KeyNews take
Why it matters
OpenAI's largest model yet signals a continued race on pre-training and post-training optimization. For founders and investors, this sets a new baseline for what 'state-of-the-art' means in Feb 2025—and what capabilities competitors need to match.
The key facts
5 to knowGPT-4.5 announced as research preview
Positioned as 'largest and best model for chat yet'
Focus on scaling pre-training and post-training
Released Feb 27, 2025
OpenAI official announcement channel
Go to the source
OpenAI Blogopenai.com
Publisher excerpt: 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.