Fact Check: which gpt model are you using ?

The Claim: "Which GPT model are you using?"

Introduction

The claim in question revolves around the inquiry into which specific model of the Generative Pre-trained Transformer (GPT) is being utilized in a given context. This is particularly relevant as OpenAI has released multiple iterations of its GPT models, each with varying capabilities and applications. Understanding which model is in use can significantly impact user experience and expectations regarding performance.

What We Know

OpenAI has developed several versions of the GPT model, including but not limited to GPT-4, GPT-4.1, GPT-4.5, and GPT-4o. Each model has been designed with specific improvements and features:

1. GPT-4: Launched as a significant advancement in AI capabilities, GPT-4 was trained on Microsoft Azure's AI supercomputers and is noted for its ability to understand and generate human-like text 3.

2. GPT-4.1: This model is described as the latest in the GPT-4 series, offering enhancements in performance and usability, particularly for software development and real-world applications 78.

3. GPT-4.5: Introduced as an upgrade to GPT-4o, this model is characterized by its larger scale and improved capabilities, although it is not positioned as a direct replacement for GPT-4o 10. It is noted for better understanding of human interaction and nuanced conversation 1.

4. GPT-4o: This model is optimized for speed and efficiency, providing capabilities similar to GPT-4 but at a lower operational cost 49.

5. ChatGPT Enterprise: This version provides access to advanced models like GPT-4o and GPT-4.1, tailored for enterprise-level applications 6.

Analysis

The inquiry into which GPT model is in use can be complex, given the rapid evolution of these models and the various contexts in which they are deployed.

Source Reliability

• OpenAI's Official Sources: The information provided by OpenAI itself (sources 1, 2, 3, 4, 6) is generally considered reliable as it comes directly from the organization responsible for the models. However, it is essential to recognize that these sources may have an inherent bias, as they aim to promote their products and innovations.

• Third-party Analysis: Articles from tech news outlets (such as 7 and 9) and blogs (like 5) can offer valuable insights but may also reflect the authors' interpretations or biases. For instance, while they provide useful context and comparisons, the accuracy of their claims can vary based on the authors' expertise and the depth of their research.

Methodology and Evidence

The methodology behind the claims made in these sources often relies on technical specifications and user feedback. However, the lack of independent verification or peer-reviewed studies can raise questions about the robustness of the claims. For example, while OpenAI states that GPT-4.5 has improved conversational abilities, the specific metrics used to measure this improvement are not always disclosed.

Conflicts of Interest

Given that many sources are directly affiliated with OpenAI or are reporting on its products, there is a potential conflict of interest. These sources may emphasize the strengths of newer models while downplaying limitations or issues that users have reported.

What Additional Information Would Be Helpful

To further clarify which GPT model is being used in specific applications, it would be beneficial to have:

• Independent evaluations or user studies comparing the performance of different models.
• Detailed technical specifications and benchmarks for each model, particularly regarding their strengths and weaknesses in various applications.
• User testimonials or case studies that highlight real-world usage and experiences with each model.

Conclusion

Verdict: Unverified

The inquiry into which GPT model is being utilized remains unverified due to several factors. While OpenAI provides detailed descriptions of its models, the information is primarily sourced from the organization itself, which may introduce bias. Third-party analyses offer additional context but lack independent verification, leading to uncertainty about the accuracy of their claims.

The limitations in available evidence include the absence of peer-reviewed studies and independent evaluations that could substantiate the performance claims of different models. Furthermore, the rapid evolution of these technologies complicates the ability to ascertain which model is currently in use in various applications.

Readers are encouraged to critically evaluate the information presented and consider the potential biases and limitations inherent in the sources. As the landscape of AI models continues to evolve, ongoing scrutiny and independent verification will be essential for establishing clarity in this area.

Sources

1. OpenAI. "Introducing GPT-4.5." OpenAI
2. Microsoft. "Azure OpenAI in Azure AI Foundry Models." Microsoft Learn
3. OpenAI. "GPT-4." OpenAI
4. OpenAI. "Introducing GPT-4o and more tools to ChatGPT free users." OpenAI
5. RisingStack. "The State of OpenAI's GPT Models - Spring 2025." RisingStack
6. OpenAI Help Center. "ChatGPT Enterprise - Models & Limits." OpenAI Help Center
7. The Verge. "OpenAI's flagship GPT-4.1 model is now in ChatGPT." The Verge
8. GitHub. "OpenAI GPT-4.1 is now generally available in GitHub Copilot." GitHub
9. Analytics Vidhya. "All About OpenAI's Latest GPT 4.1 Family." Analytics Vidhya
10. Pure AI. "OpenAI Launches GPT-4.5 'Orion,' Its Largest AI Model Yet." Pure AI