GPT-4.5: OpenAI’s New Generative AI Model
A Bigger and More Compute-Intensive Model
GPT-4.5 is the latest generative AI model from OpenAI, and it’s bigger and more compute-intensive than ever. This new model is designed to better understand what users mean with their prompts, and it’s available to select users who are part of the first wave to try it out. However, to access GPT-4.5, users will need to sign up for OpenAI’s $200-a-month ChatGPT Pro subscription.
A Year of New AI Model Releases
2025 has already seen a flurry of new AI model releases, including a hybrid reasoning model from Anthropic and a powerful model from Chinese researchers at DeepSeek. In response, OpenAI dropped a "mini" version of its reasoning model just a month ago. This latest move from OpenAI is part of its strategy to build the infrastructure needed to fuel even larger models.
A Different Approach
GPT-4.5 is a departure from other recent AI innovations, such as DeepSeek’s R1, which aimed to match the performance of a frontier model with minimal resources. OpenAI is sticking to its "bigger is better" approach, believing that this will allow the model to capture more nuances of human emotions and interactions.
How Big is GPT-4.5?
The exact size and compute intensity of GPT-4.5 remain unclear, as OpenAI declined to share specific numbers. However, according to Mia Glaese, who leads OpenAI’s alignment team and human data team, the model’s size is likely to help it hallucinate less frequently. "If you know more things, you don’t need to make things up," she says.
What’s It Like to Use GPT-4.5?
Pro users are getting an early look at the new model, with rollouts for Plus and Team users scheduled for next week and Enterprise and Edu users the week after. GPT-4.5 supports web search, canvas feature, and uploads of files and images, but it’s not yet compatible with AI Voice Mode.
Academic Benchmarks
OpenAI released academic benchmark results showing that GPT-4.5 outperformed the o3-mini model on language benchmarks, but was outpaced on math. However, the researchers believe these measurements don’t capture the full story.
Conclusion
GPT-4.5 is a significant step forward in the development of generative AI models. While its size and compute intensity are impressive, it’s unclear what specific advantages it will bring to users. As the model is rolled out to more users, it will be interesting to see how it performs in real-world applications.
FAQs
Q: What is GPT-4.5?
A: GPT-4.5 is a new generative AI model from OpenAI that is bigger and more compute-intensive than its predecessors.
Q: How big is GPT-4.5?
A: The exact size and compute intensity of GPT-4.5 are unclear, as OpenAI declined to share specific numbers.
Q: What features does GPT-4.5 support?
A: GPT-4.5 supports web search, canvas feature, and uploads of files and images, but it’s not yet compatible with AI Voice Mode.
Q: Is GPT-4.5 a reasoning model?
A: No, GPT-4.5 is not a reasoning model. OpenAI is working on a blended experience for future releases, where users won’t have to choose between different models.
