OpenAI Launches GPT-4.5 for ChatGPT—It's Huge and Compute-Intensive
Prior to this launch, 2025 has already been filled with new AI model releases. Anthropic recently put out a hybrid reasoning model for its Claude chatbot. Before that, Chinese researchers at DeepSeek rocked Silicon Valley with their release of a powerful model trained on a tiny budget, prompting OpenAI to drop a 'mini' version of its reasoning model a month ago.
Alongside these new releases, OpenAI promised to invest billions into building the AI infrastructure required to fuel more massive models. And GPT-4.5 is a reiteration of this current strategy from the startup: Bigger is better.
ChatGPT 4.5 is in stark contrast to other recent AI innovations, like DeepSeek's R1, that attempted to match the performance of a frontier model with as few resources as possible. OpenAI still sees a strong path forward through scaling its models. According to researchers who worked on GPT-4.5, this kind of maximalist mindset to model development has captured more of the nuances of human emotions and interactions.
They see the model's size as also potentially helping this iteration hallucinate with less frequency than past releases. 'If you know more things, you don't need to make things up,' says Mia Glaese, who leads OpenAI's alignment team and human data team. Exactly how big or compute-intensive GPT-4.5 is remains unclear—OpenAI declined to share specific numbers.
So, what's it like to use the new model? GPT-4.5 supports the web search and canvas feature as well as uploads of files and images, though it's not yet compatible with the AI Voice Mode.
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