OpenAI has released GPT-4.5, its largest and most sophisticated language model to date. The new AI system represents the company’s final model without “chain-of-thought reasoning” capabilities, signaling a shift in how future AI systems will process information.
“What sets the model apart is its ability to engage in warm, intuitive, naturally flowing conversations, and we think it has a stronger understanding of what users mean when they ask for something,” said Mia Glaese, vice president of research at OpenAI.
Trained on Microsoft Azure AI supercomputers, GPT-4.5 demonstrates broader knowledge and deeper understanding that reduces hallucinations and increases reliability. OpenAI CEO Sam Altman described the model on social media: “It is the first model that feels like talking to a thoughtful person to me… this isn’t a reasoning model and won’t crush benchmarks. It’s a different kind of intelligence and there’s a magic to it I haven’t felt before.”
Technology and Access
GPT-4.5 improves on previous models through:
- Scaled unsupervised learning with increased computing power and data
- New training techniques enabling larger models to learn from smaller ones
- Enhanced ability to understand user intent and nuance
The model is currently available to ChatGPT Pro subscribers ($200 monthly) and will reach ChatGPT Plus users ($20 monthly) next week. API access is also available for developers. OpenAI notes that GPT-4.5 is “very large and compute-intensive,” making it more expensive to operate than previous versions.
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Industry Shift Toward Reasoning
GPT-4.5’s release comes amid an industry-wide pivot toward AI systems with reasoning capabilities. Companies including Google, Meta, and DeepSeek are developing models that solve complex problems through discrete, logical steps.
OpenAI has already introduced reasoning-focused models like OpenAI o1 and o3-mini for STEM and logic problems. This shift partly stems from diminishing returns on simply increasing model size and training data.
“We believe reasoning will be a core capability of future models, and that the two approaches to scaling—pre-training and reasoning—will complement each other,” OpenAI stated. “As models like GPT‑4.5 become smarter and more knowledgeable through pre-training, they will serve as an even stronger foundation for reasoning and tool-using agents.”
The AI market is projected to reach $1.8 trillion by 2030, with applications spanning healthcare, finance, and customer service sectors.
Practical Applications and Limitations
GPT-4.5 excels at writing and creative tasks while demonstrating what OpenAI describes as greater “emotional intelligence” and aesthetic intuition. The model shows improved capability in understanding nuanced requests and implicit expectations.
Despite these advances, ethical concerns persist regarding potential bias, privacy, and misuse. OpenAI has released GPT-4.5 as a “research preview” to better understand its capabilities and limitations.
Experts note that while reasoning-focused AI systems may outperform traditional models on standardized tests, such benchmarks don’t always predict real-world performance. Even advanced systems can still generate incorrect information—a phenomenon known as hallucination.
