OpenAI has just struck a major blow with the launch of GPT-4.5. This new language model, unveiled on February 27, 2025, marks a turning point in OpenAI’s approach with its emphasis on advanced conversational capabilities and enhanced emotional intelligence. While the AI race is in full swing, with competitors such as Grok 3 and Claude 3.7 Sonnet recently launched, GPT-4.5 positions itself as an interesting alternative, emphasizing intuition and human understanding rather than pure reasoning power.
In brief
GPT-4.5 is OpenAI’s latest language model, described as their “most extensive and scholarly model to date”.
Here are the key points to remember:
- Availability: Preview available for ChatGPT Pro (€200/month) subscribers, launch on ChatGPT Plus ($20/month) planned for the following week.
- Improved abilities: Better pattern recognition, enhanced creativity and superior emotional intelligence.
- Reduced hallucinations: Factual error rate reduced from 61.8% (GPT-4o) to 37.1%.
- Extended context: 128K token context window, maximum output of 16,384 tokens.
- Pricing: $75/M tokens in, $150/M tokens out (significantly more expensive than its competitors).
- Performance: 62.5% accuracy on SimpleQA, outperforming GPT-4o and o1.
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OpenAI’s strategy: between intuition and reasoning
OpenAI has taken an interesting approach with GPT-4.5, returning to a more instinctive model after focusing on thinking models such as o1 and o3-mini.
This strategic decision aims to create a balance between advanced reasoning capabilities and a more natural, fluid interaction with users.
A model focused on unsupervised learning
In contrast to recent OpenAI models that focused on step-by-step reasoning, GPT-4.5 focuses on large-scale unsupervised learning.
This approach allows the model to gain a more intuitive and contextual understanding of language and human interaction.
The last iteration before reasoning integration
OpenAI has announced that GPT-4.5 will be their last model without integrated reasoning capabilities.
This statement suggests that the company plans to combine the benefits of unsupervised learning with more advanced reasoning capabilities in future iterations.
Technical specifications and performance
GPT-4.5 boasts impressive technical capabilities and enhanced performance in a variety of areas.
Architecture and training
The model was trained on Microsoft Azure AI supercomputers, benefiting from architectural innovations and optimizations enabling processing and learning from massive amounts of data.
This approach has enabled GPT-4.5 to acquire an extensive knowledge base and a more nuanced understanding of language and human interaction.
Benchmarks and comparisons
Performance tests reveal mixed results depending on application areas:
- General knowledge and factual accuracy: GPT-4.5 excels in these areas, surpassing its predecessors.
- Reasoning tasks: Although improved over GPT-4o, GPT-4.5 still lags behind specialized models like o3-mini for complex scientific and mathematical tasks.
New features and enhancements
GPT-4.5 brings several significant improvements over its predecessors:
Enhanced conversational capabilities
The model offers more natural dialogues with concise responses that seem less robotic.
This enhancement makes interactions with GPT-4.5 smoother and more enjoyable for users.
Enhanced emotional intelligence
GPT-4.5 is designed to better capture users’ emotions and needs. Internal testers describe it as “warm” and “intuitive”.

This ability allows the model to better understand the emotional context of conversations and respond more appropriately.
Reducing hallucinations
The rate of false information generation decreased significantly, from 61.8% for GPT-4o to 37.1% for GPT-4.5.
This improvement enhances the model’s reliability for tasks requiring high factual accuracy.
Extended capabilities
GPT-4.5 supports file and image uploads, and excels in writing and coding projects.
However, advanced features such as voice and video are not yet included.
Advantages and disadvantages
Advantages
- More natural interaction: GPT-4.5 offers a smoother, more intuitive conversational experience.
- Improved factual accuracy: Reduced hallucinations enhance model reliability.
- Polyvalence: Performs well in a variety of fields, from writing to programming.
- Emotional intelligence: Better understanding and response to users’ emotional nuances.
Disadvantages
- High cost: GPT-4.5 is significantly more expensive than its competitors, which could limit its accessibility.
- Limited reasoning performance: Less capable than specialized models for complex scientific and mathematical tasks.
- Lack of advanced features: No support for voice or video at this stage.
GPT-4.5 represents an interesting evolution in the language model landscape, banking on emotional intelligence and conversational capabilities rather than pure computing power.
While it offers significant improvements in terms of factual accuracy and natural interaction, its high cost and limitations in certain specialized fields could hinder its widespread adoption.
However, GPT-4.5 paves the way for a new generation of more intuitive and empathetic AI models, capable of better understanding and responding to human needs.
While OpenAI is already preparing to integrate reasoning capabilities into its future models, GPT-4.5 marks an important milestone in the evolution of conversational artificial intelligence.
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