OpenAI, the developer behind ChatGPT, has released the latest version of its platform, GPT-4.5. This version is claimed to be the largest and most advanced LLM (Large Language Model) OpenAI has launched to date.
GPT-4.5 marks a significant step forward in scaling both pre-training and post-training processes. By enhancing unsupervised learning, GPT-4.5 improves its ability to recognize patterns, connect concepts, and generate creative insights.
With a broader knowledge base, improved understanding of user intent, and heightened emotional intelligence, GPT-4.5 proves useful for a wide range of tasks, such as writing, programming, and solving practical problems. OpenAI hopes this version will produce fewer errors.
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What’s New in GPT-4.5?
As an initial step, OpenAI has released GPT-4.5 as a preview to better understand its strengths and weaknesses. OpenAI is continuing to explore the full range of capabilities that GPT-4.5 can offer. So, what’s new in GPT-4.5?
1. Enhanced Unsupervised Learning
OpenAI developed their AI using two complementary paradigms: unsupervised learning and reasoning. Both of which are key to artificial intelligence.
Unsupervised learning improves the model’s accuracy and intuition. Models like GPT-3.5, GPT-4.0, and GPT-4.5 were built on this paradigm.
Meanwhile, enhanced reasoning teaches the model to think and form logical sequences before responding, enabling it to handle more complex logic. This paradigm is being developed in models such as OpenAI o1 and OpenAI o3-mini.
Thanks to unsupervised learning and reasoning, GPT-4.5 delivers more accurate and relevant responses compared to previous GPT models.
Hallucination refers to errors generated by a language model when responding to a user prompt. The lower the hallucination rate, the less likely the model is to produce incorrect or made-up information.
2. Improved Understanding for Human Collaboration
For GPT-4.5, OpenAI claims to have developed new, scalable techniques using data from smaller models. These techniques are said to improve GPT-4.5’s comprehension and conversational capabilities.
GPT-4.5 is more collaborative with humans and shows higher creativity compared to previous models.
3. Stronger Reasoning
GPT-4.5 doesn’t respond immediately. It provides reasoning first, setting it apart from dedicated reasoning models like OpenAI o1. Compared to OpenAI o1 and OpenAI o3-mini, GPT-4.5 is a more versatile and intelligent model.
4. Enhanced Safety
Each improvement in the model’s abilities is also an opportunity to make it safer. OpenAI trained GPT-4.5 using new supervision techniques, combining Supervised Fine-Tuning (SFT) and Reinforcement Learning from Human Feedback (RLHF), as used in GPT-4o.
OpenAI hopes this work will lay the foundation for better alignment in future models.
GPT-4.5 Use Case
The image below shows a case study using GPT-4.5. Thanks to its emotional quotient technology, GPT-4.5 provides responses that feel more natural than earlier GPT models.
GPT-4.5 offers responses that seem to affirm the user’s intent, while previous models tend to respond more directly.
How to Use GPT-4.5 in ChatGPT
Since its release in late February, GPT-4.5 has been available for ChatGPT Pro users. You can select GPT-4.5 from the model menu across platforms—web, desktop, and mobile apps. For users on other ChatGPT plans, GPT-4.5 will be rolled out gradually. Free-tier users currently do not have access to GPT-4.5.
GPT-4.5 includes access to up-to-date information through search, supports file and image uploads, and offers a canvas for writing and coding—features highly useful for writers and programmers.
If you’re unfamiliar with Canvas in ChatGPT, check out our article on What is Canvas in ChatGPT and How to Use It.
Currently, GPT-4.5 doesn’t support multimodal features like voice, video, and screenshots in ChatGPT, but OpenAI has promised improvements in user experience.
How to Use GPT-4.5 via API
OpenAI is previewing GPT-4.5 on Chat Completions API, Assistant API, and Batch API for developers on all paid plans.
This model supports key features such as Function Calling, Structured Outputs, Streaming, and System Messages. Additionally, it now supports vision capabilities through image input.
According to OpenAI’s early testing, developers will find GPT-4.5 especially useful for writing, communication, learning, training, and brainstorming.
That’s the latest release and features of ChatGPT-4.5. Stay updated with the world of artificial intelligence only at Tonjoo.
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Updated on May 9, 2025 by Moch. Nasikhun Amin
