GPT-4.5
| Developer | OpenAI |
|---|---|
| Year introduced | February 27, 2025 |
| Language/s | 15 languages[1] |
GPT-4.5 (codenamed "Orion")[2] is a large language model developed by OpenAI as part of the GPT series. Officially released on February 27, 2025, GPT-4.5 is available to users subscribed to the ChatGPT Plus and Pro plans across web, mobile, and desktop platforms. Access is also provided through the OpenAI API and the OpenAI Developer Playground[3]
Overview
[edit]It was primarily trained using unsupervised learning, which improves its ability to recognize patterns, draw connections, and generate creative insights without reasoning. This method was combined with supervised fine-tuning and reinforcement learning from human feedback. It was trained using Microsoft Azure.[3]
Sam Altman described GPT-4.5 as a "giant, expensive model".[4] As of February 2025, through OpenAI's API 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.[5]
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.[1]
A pre-print (not peer reviewed) study in March 2025 found that GPT-4.5 passed the Turing Test.[6]
In April 2025, OpenAI announced that it was phasing out GPT-4.5 from API access in favor of GPT-4.1.[7]
Reception
[edit] | The examples and perspective in this section may not represent a full view of the subject. (April 2025) |
 | This section needs additional citations for verification. (April 2025) |
Cade Metz, writing for The New York Times, stated that the model "signifies the end of an era" and was "unlikely to generate as much excitement as GPT-4".[8] Many other outlets, such as The Verge and Axios, also covered the model's release.[9][10][vague]
References
[edit]- ^ a b OpenAI (27 February 2025). OpenAI GPT-4.5 System Card (PDF) (Report). Retrieved 2025-03-03.
- ^ Zeff, Maxwell (2025-02-27). "OpenAI unveils GPT-4.5 'Orion,' its largest AI model yet". TechCrunch. Retrieved 2025-03-01.
- ^ a b "Introducing GPT-4.5". openai.com. Retrieved 2025-02-28.
- ^ Novet, Jordan (2025-02-27). "OpenAI launching GPT-4.5, its next general-purpose large language model". CNBC. Retrieved 2025-03-01.
- ^ "Pricing". OpenAI. Archived from the original on February 27, 2025. Retrieved 2025-02-28.
- ^ Jones, Cameron R.; Bergen, Benjamin K. (2025). "Large Language Models Pass the Turing Test". arXiv:2503.23674 [cs.CL].
{{cite arXiv}}: CS1 maint: date and year (link) - ^ Wiggers, Kyle (2025-04-14). "OpenAI plans to phase out GPT-4.5, its largest-ever AI model, from its API". TechCrunch. Retrieved 2025-04-27.
- ^ Metz, Cade (2025-02-27). "OpenAI Unveils GPT-4.5 for More 'Natural Conversation'". The New York Times. ISSN 0362-4331. Retrieved 2025-02-28.
- ^ Warren, Tom (2025-02-27). "OpenAI announces GPT-4.5, warns it's not a frontier AI model". The Verge. Retrieved 2025-02-28.
- ^ Fried, Ina (2025-02-27). "OpenAI debuts GPT-4.5, its biggest model yet". Axios. Retrieved 2025-02-28.
External links
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