GPT-4.5 facts for kids
| Developer | OpenAI |
|---|---|
| Year introduced | February 27, 2025 |
| Language/s | 15 languages |
GPT-4.5 (or Orion) is a large language model within OpenAI's GPT series. It was released on February 27, 2025. GPT-4.5 can be accessed by Pro users through the model picker on web, mobile, and desktop, with plans to expand to other tiers. It can also be accessed via the OpenAI API or the OpenAI Developer Playground.
Overview
It was primarily trained using unsupervised learning, though combined with supervised fine-tuning and reinforcement learning from human feedback. It was trained using Microsoft Azure.
Sam Altman described GPT-4.5 as a "giant, expensive model". As of February 2025, it costs $75 per million input tokens and $150 per million output tokens, whereas GPT-4o only costs $2.50 per million input tokens and $10 per million output tokens.
The model was tested on the MMLU test set, which tested 15 different languages, namely Arabic, Bengali, Chinese, English, French, German, Hindi, Indonesian, Italian, Japanese, Korean, Portuguese, Spanish, Swahili, and Yoruba, with the model outperforming GPT-4o on all of them.
