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ChatGPT 4.5 vs 4o | What You Need to Know in 2025

ChatGPT 4.5 vs 4o | What You Need to Know in 2025

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ChatGPT is an advanced chatbot powered by a large language model that OpenAI developed, enhancing its capabilities to understand and generate human-like texts. It is utilised for various tasks involving natural language processing, including chatbot creation, content generation, and translation. OpenAI introduced GPT-4.5, which elevates step-by-step reasoning, enhancing the natural flow of conversations. This upgrade is not intended to surpass models designed for intricate reasoning, nor does it address demanding tasks like scientific problem-solving or programming. Instead, OpenAI concentrates on refining daily interactions, writing, and knowledge-driven inquiries. In the sections below, we will see how the new GPT-4.5 differs from 4o and which is better. 

Overview of GPT- 4.5: Advanced Reasoning and Depth

This enhanced version is designed for intricate tasks, thorough problem-solving, and creative expressions. It offers improved accuracy for managing complex workflows and excels in coding and long-form content generation. However, it has a drawback: It is expensive, priced at $200 per month or via API at $75 for every 1 million input tokens and $150 for each million output tokens. 

Overview of GPT- 4o: Advanced Reasoning and Depth

ChatGPT-4o focuses on speed, cost-effectiveness, and multimodal capabilities, including text, voice, and images. It efficiently manages tasks like customer service, real-time operations, and simpler workflows for $20/month or through API for $2.50 per 1M input tokens and $10 per 1M output tokens. 

How does Chatgpt-4.5 differ from 4o?

We know that 4.5 is the latest version, but how does it compare to 4o? Let's briefly examine the differences between the two versions' capabilities. 

1. Problem-Solving Capability

  • GPT-4o: This version is more concise and straightforward, providing to-the-point answers and avoiding additional explanation. Still, the solutions and answers are precise and clear, and the processing is more fluid and expresses the logic behind each move more explicitly. 
  • GPT-4.5: The solutions and answers given by 4.5 are more structured and explained in each step, with all the additional explanation required. It exaggerates the reasoning behind each move and explains the solutions in bullet points without exact numbering. 

2. Creative Writing Ability

  • GPT-4o: In creative writing 4o, delivers understandable and precise content without over-addition unnecessary details. The motto behind the content will be clear and easy, but described enough to understand the key concepts and ideas behind the content. 
  • GPT-4.5: If 4.5 is used for creative writing, it may add details to make the content more informative. Besides the key concepts and data, it adds more information, or probably the reasoning and stories behind a phenomenon. 

3. AI Personality

  • GPT-4o: The AI personality of 4o is more structured and distinguished. It clearly gets to the point and explains it briefly. It presents proper information that shows practicality and realism. In addition to that, it also adds metaphors and humorous terms, making the content more natural and engaging and adding more personality to it. 
  • GPT-4.5: 4.5 is a little more brief about the solutions and answers, making the content more technical and succinct. It also adds more detailed terminologies and strategies, making the content more informative and explaining its cruciality.  It also adds humorous terms, but its solutions and contents are more scholastic rather than being a little lively. 

4. Critical Thinking

  • GPT-4o: 4o delivers facts and great examples, allowing the reader to understand the solutions conveniently. It focuses more on balance, describing the pros and cons of an action in a more understandable way. 
  • GPT-4.5: The 4.5 model also described the reasons and pros and cons, but in a more brief way, adding more depth to the content and exploring different angles behind it. It adds knowledge to the solutions, but can be less engaging for some users. 

5. Factual Accuracy

  • GPT-4o: This model adds more real-time references, highlighting the key points and focusing on the solution's understandability. These references let users learn the concept quickly, easily, and conveniently. 
  • GPT-4.5: This model also covers all the topics but adds more information, providing more details and exploring the topics more broadly. 4.5 also adds easy-to-understand examples, but in a more detailed way. 

6. Multimodal understanding

  • GPT-4o: 4o makes the content beginner-friendly, allowing even a beginner to understand the concepts easily. Instructions are structured and detailed, making visualising each step and point easy. The tone is easy and more rewarding for users. 
  • GPT-4.5: Each step and explanation is explained well, but being brief makes the answer less engaging and unclear. Although answers and solutions are simple, they lack accuracy due to a lack of more information. 

Which is better among ChatGPT-4.5 and 4o?

Both models excel in performance across all areas, but users must choose the most suitable one. Model 4o offers enhanced clarity, emphasising engagement and understanding by structuring content more effectively and infusing it with personality. Conversely, Model 4.5 provides a more comprehensive and detailed explanation of the content. The choice ultimately lies with the user and their preferences. For those seeking a more straightforward approach, 4o is the better option. However, if users prefer a concise understanding of a concept, then 4.5 is their best choice. 

Pros and Cons of each model

Now that we have learned about the differences between the two Chatgpt models, we will explore their advantages and disadvantages. 

GPT-4.5 Pros:

  • In-depth knowledge & precision: These models are developed to deliver answers and solutions based on recent data. The chances of errors are low, and users can have more accurate answers with fewer mistakes.
  • Creative responses: This AI model was developed to present more natural replies, displaying more emotional intelligence and creativity. Thus, it becomes a more suitable model for storytelling, creative writing, and providing sensitive advice.
  • Excellent outcomes across various tasks: Regarding complex evaluations, the 4.5 model surpasses the 4th. These tasks include coding, scientific solutions, and reasoning, enabling users to easily understand these complex concepts. 

"In testing GPT-4.5 for code generation, it handled nested logic and API integrations better than 4o. However, for tasks like summarizing customer feedback, 4o’s speed and clarity stood out."

GPT-4.5 Cons:

  • More Expensive and Limited Access: This new model's API is more costly per token than that of 4o. Hence, not everyone eager to use it can use 4.5 in operations.
  • Multimodal Limitations: The new 4.5 has not been fully Multimodal yet, as it can not handle the audio-based input or output. It can perfectly handle text and images, but real-time video understanding and voice-based conversation are not supported yet. 
  • Accumulative Upgrade Feel: The new model doesn't present anything that can not be done by 4o unless one has special demanding tasks. So, not everyone can use this new model. 

GPT-4o Pros:

  • More Multimodal capabilities: 4o is fully developed in Multimodal capabilities. It can handle texts, images, and speech, offering more interactive uses, such as a voice assistant or an image-based conversation. 
  • Quick and Efficient: GPT 4o surpasses the 4.5 based on its speed. This model was developed to respond quickly, matching human reaction time, making conversations more fluid. Besides that, it is more cost-effective compared to 4.5, which costs much less. 
  • Functional and Reliable: 4o is a more convenient option for everyday tasks, as it follows the instructions and provides more accurate and brief answers to questions. 

"As a machine learning researcher working with GPT models since 2020, I’ve explored the strengths and limitations of each iteration, from GPT-2 to the latest 4o."

GPT-4o Cons:

  • Outdated Knowledge: This AI model provides solutions based on 2023 data, which lacks the latest information and awareness. Because of the outdated information, it lacks the knowledge that 4.5 possesses. 
  • More chances for errors: GPT 4o is more likely to provide factual mistakes, making it incapable of giving accurate answers. When a complex question is asked, the 4o model sometimes goes a little off track while answering. 
  • Not as user-friendly responses: GPT-4o also lacks emotional depth, and the tone can be formulaic, making it less suitable for creative writing and discussing sensitive topics. 

"OpenAI's official announcement confirms that 4o is designed to respond in real time, with a 232ms average latency for voice prompts."

Final Verdict: GPT-4.5 vs 4o

Choose GPT-4.5 if you need depth, accuracy, and coding performance. Go with GPT-4o if you value speed, cost-efficiency, and multimodal interaction. For most users, 4o will be the go-to model for everyday productivity in 2025.

FAQs

Q1. What is the difference between GPT-4.5 and GPT-4o?

GPT-4.5 is optimized for deep reasoning, coding, and long-form content. It offers step-by-step explanations and excels at technical and complex tasks. However, it lacks full multimodal capabilities and is more expensive to use.

GPT-4o (the “o” stands for “omni”) is designed for speed, efficiency, and multimodal interaction—handling text, voice, and image inputs seamlessly. It’s faster, more affordable, and better suited for real-time applications like voice assistants and live customer support.

In short:

  • GPT-4.5 = More analytical, better for coding and complex workflows

  • GPT-4o = Faster, cheaper, and supports voice, vision, and text

Q2. Is GPT-4.5 worth the higher price?

It depends on your use case.
If you need precise, detailed responses for tasks like coding, scientific writing, or academic research, GPT-4.5’s enhanced reasoning and structure may justify the higher cost.

GPT-4o is OpenAI’s first fully multimodal model, capable of handling text, images, and live voice input/output with near-human latency.

Use GPT-4.5 if your work involves advanced reasoning or technical detail.
Use GPT-4o for faster responses, voice/image integration, and general tasks.

Q3. Can GPT-4.5 handle multimodal input?

Not fully.
GPT-4.5 supports text and image inputs, making it partially multimodal. However, it does not support voice input or real-time audio conversations, unlike GPT-4o.

GPT-4o is OpenAI’s first fully multimodal model, capable of handling text, images, and live voice input/output with near-human latency.

GPT-4.5: Text + Images
GPT-4o: Text + Images + Voice (Full multimodal)

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