OpenAI releases GPT-4.5 for ChatGPT

On February 27, 2025, OpenAI unveiled the latest iteration of its large language model, GPT-4.5, marking a significant milestone in the evolution of artificial intelligence. GPT-4.5 is initially available to subscribers of the ChatGPT Pro service at $200 per month, with plans to expand access to additional paying subscribers in the coming weeks.

What is ChatGPT-4.5?

OpenAI-GPT-4.5
OpenAI-GPT-4.5

ChatGPT-4.5 is the improved version of the GPT-4 model, launched as a transitional step before GPT-5. It offers better reasoning performance, significantly reduces factual errors, and better adapts to complex contexts. Thanks to optimizations in language and multimodal (text, voice, image) management, ChatGPT-4.5 offers a more natural and efficient user experience, whether for research, content creation, or online professional assistance.

Key Features of GPT-4.5

Improved pattern recognition and linking: GPT-4.5 benefits from enhanced pattern recognition and connection-making capabilities, making it better able to generate creative ideas without explicit reasoning.

Broader knowledge base and emotional intelligence: The model has a broader knowledge base and a higher emotional quotient (EQ), which improves its ability to understand user intent and provide more empathetic responses.

Reduced hallucinations: GPT-4.5 is designed to have fewer hallucinations, meaning it is less likely to generate false or inaccurate information compared to its predecessors.

Support for file and image uploads: Users can upload files and images, and the model supports writing and coding tasks, although it does not currently support voice, video, or screen sharing.

While GPT-4.5 brings significant improvements, OpenAI stresses that it is not a state-of-the-art AI model and cannot outperform previous specialized versions like o1 ou o3-mini. However, GPT-4.5 is still highly regarded for its ability to write, program, and solve practical problems, thanks to its refined personality and better pattern recognition.

Compare GPT 4.5 with other models
Compare GPT 4.5 with other models

Availability and deployment

GPT-4.5 is being rolled out in phases:

  • ChatGPT Pro Subscribers: immediate access for users Pro.
  • ChatGPT Plus and Team subscribers: access will be available next week.
  • Enterprise and Education Subscribers: access will be granted the following week.

One notable point is that the operating costs of GPT-4.5 are significantly higher than those of previous versions. Specifically, the entry price for this model is $75 per million tokens, compared to $2,50 per million tokens for GPT-4o. This reflects the complexity and computational resources required to run GPT-4.5.

GPT-4.5 vs GPT-4.o
GPT-4.5 vs GPT-4.o

Future developments

OpenAI CEO Sam Altman has hinted at future models incorporating more advanced reasoning capabilities, marking a move toward more sophisticated large language models. The company is also simplifying its model naming conventions, with GPT-5 set to follow in the coming months.

Conclusion

The launch of GPT-4.5 represents a significant step forward for OpenAI, improving the capabilities of ChatGPT and paving the way for future AI innovations. As the AI ​​landscape continues to evolve, OpenAI remains at the forefront, pushing the boundaries of what’s possible with large language models.