Published on: March 6, 2025 / update from: March 6, 2025 - Author: Konrad Wolfenstein
GPT-4.5 now available for Chatgpt plus subscriptions! Openai-AI model Introductory process and availability-Image/screenshot: Xpert.digital
Strategic market launch: GPT-4.5 and access for users
After pro- and team subscriptions, now also exclusively for Plus (March 5, 2025): Openai's new approach with GPT-4.5
GPT-4.5 was published on February 27, 2025 by Openai as a “Research Preview” and marks a significant progress in the development of large voice models. The new model was initially made accessible exclusively for Chatgpt Pro subscribers, whereby the introduction for Plus users began in early March 2025. This gradual introduction reflects Openai's strategic approach to initially made your latest technologies available to a limited user group before they are rolled out wider.
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The introductory process and availability
Openai started the introduction of GPT-4.5 as a “Research Preview” on February 27, 2025, with initially exclusively users of the premium service Chatgpt Pro, which costs $ 200 per month, received access. This selective access enabled the company to test the model under real conditions and at the same time collect feedback from paying users before making it available to a broader public.
As announced by Openaai, the gradual introduction for plus and team subscribers began the following week. Sam Altman, CEO of Openaai, confirmed on March 5, 2025 to X that the introduction of GPT-4.5 for plus subscribers had officially started and that the process would probably be completed within a few days. This staggered introduction was deliberately chosen in order to avoid system overload through suddenly high demand and to enable users extensive real-time interactions with the new technology.
Altman said in his articles on X (formerly Twitter) that Openaai GPT-4.5 would have been immediately available to all users, but was not possible due to the need to start with a very low usage limit. The full roller plan provided for the plus and team users to receive access and edu users in the second week.
Properties and skills of GPT-4.5
GPT-4.5 is described by Openai as your largest and best model for chat use. It represents significant progress in the scaling of pre-training and post-training, with the focus on improving the insurmountable learning. This distinguishes it from Openais O1 and O3 models that focus on Reasoning capabilities.
Early tests show that interactions with GPT-4.5 are more natural, which is due to its broader knowledge base, improved ability to record user generation and greater “emotional intelligence”. These properties make it particularly useful for tasks such as improving texts, programming and solving practical problems.
A remarkable property of GPT-4.5 is its improved ability to conduct conversations that, according to Sam Altman, feel “like a conversation with a thoughtful person”. The model offers a deeper level of sentiment analysis with the ability to understand when there should be advice or just listen if it is confronted with emotionally charged inquiries.
GPT-4.5 also supports file and image uploads, enables the analysis of additional data and is characterized by impressive multilingual competence in 14 languages, including Arabic, Bengal, Chinese, French, German, Hindi, Italian, Japanese, Korean, Spanish and Suaheli.
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Training methods and technical features
Openai has used a number of advanced techniques for the development and training of GPT-4.5. Based on GPT-4O, it includes expanded pre-training and other new approaches to improve the performance and reduce the risk of hallucinations.
Training techniques include monitored fine tuning, whereby GPT-4.5 has been adapted to human expectations and trained to effectively follow instructions. During this phase, Openai implemented advanced data filtering in order to minimize exposure to potentially harmful content. In addition, Reinforcement Learning From Human Feedback (RLHF) was used, in which human evaluators classified the model editions based on quality, helpfulness and security. Finally, GPT-4.5 was trained with Instruction Hierarchy Training to follow an instruction hierarchy that prioritizes system messages over contradictory user instructions to prevent prompt injections.
Openai did not disclose the exact size or parameter number for GPT-4.5 in the market launch, but claims that it was the company's largest model ever built at the time of publication. This emphasis on the model size is contrasting to other recent AI innovations that have tried to achieve the performance of a frontier model with as few resources as possible.
Differences to previous models
GPT-4.5 builds on the basics created with GPT-4 and GPT-4O, and introduces significant improvements in relation to accuracy, emotional intelligence, naturalness of conversation and alignment on user intent.
A striking difference between GPT-4O and GPT-4.5 is the focus: While GPT-4O was geared towards multimodal integration and could process text, images and audio, GPT-4.5 focuses on scaled insurmountable learning and mainly processes text and images. However, both models support a context length of 128,000 tokens.
Another decisive difference is shown in the prices: While GPT-4O was relatively affordable at $ 2.50 per 1 million input tokens and $ 10 per 1 million output tokens, GPT-4.5 is significantly more expensive at $ 75 per 1 million input tokens and $ 1 million output tokens. This price difference reflects the increased complexity and the computing effort that GPT-4.5 requires.
GPT-4.5 focuses on the further development of the insecurately persistent learning and not on Chain-of-Though Reasoning. In contrast to Reasoning-focused models such as O3 and Deepseek R1, the Chain-of-Though processing to think methodically through complex problems, GPT-4.5 responds based on its training data and sample recognition skills. This makes GPT-4.5 a more general model as a specialized Reasoning models that perform excellently in complex mathematics, science and logic problems.
Costs and terms of use
GPT -4.5 is available to different user groups, but with different access costs and conditions. GPT-4.5 was accessible for Chatgpt Pro subscribers who pay $ 200 per month from the start. Chatgpt Plus users received limited access from the beginning of March 2025.
For developers and organizations that want to integrate GPT-4.5 in their applications, access via Openais API is possible, but at significant costs: $ 75 per million input tokens and $ 150 per million output tokens. Alternatively, access is also available in a preview version via the Azure Openai Service from Microsoft.
Openai pointed out that GPT-4.5 is a very large and arithmetic model, which makes it more expensive than GPT-4O and does not position it as a replacement for this older model. Based on these costs, the company evaluates whether it will offer GPT-4.5 in the API in the long term, while at the same time it brings the support of current functions to the development of future models.
Future prospects and industry context
GPT-4.5 was published in a dynamic environment in which several leading AI companies launched new models. Openais GPT-4.5 In the same week as Anthropics Claude 3.7, which was released on February 24, 2025, shortly after Xais Grok 3, which was launched on February 18, 2025.
While GPT-4.5 is a significant progress, speculation about Openai's work on GPT-5, which has not yet been confirmed in the company's public timetable. In the AI community there are increasing discussions about whether the approach to develop ever larger models reaches its limits-a view that is also represented by Openai's former chief scientist Ilya Sutskever. The company's claims about GPT-4.5 act like a counter-notification to these skeptics.
Openai believes that Reasoning will be a core ability of future models and that the two scaling approaches-pre-training and reading-will complement each other. With increasing intelligence and knowledge enrichment through pre-training, models such as GPT-4.5 will serve as an even greater basis for the reasoning and tool-use agents.
The introduction of GPT-4.5 underlines OpenAis on the scaling of its models despite the financial and technical challenges associated with this approach. The coming months will show how this new model is recorded by the broader user community and which unexpected application cases could arise.
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