OpenAI has announced the release of GPT-4.5, its most advanced large language model to date, featuring significant improvements in business-critical areas including factual accuracy, reduced hallucinations, and enhanced emotional intelligence—capabilities that address key enterprise concerns regarding AI deployment reliability and usefulness.
GPT-4.5 represents a strategic shift in AI development priorities, focusing on practical business applications rather than purely academic benchmarks. The model demonstrates a 62.5% accuracy rate on the SimpleQA evaluation—a 24.3 percentage point improvement over GPT-4o—while reducing hallucination rates to 37.1%, compared to GPT-4o's 61.8%.
"Early testing shows that interacting with GPT-4.5 feels more natural. Its broader knowledge base, improved ability to follow user intent, and greater 'EQ' make it useful for tasks like improving writing, programming, and solving practical problems. We also expect it to hallucinate less," OpenAI stated in its announcement.
The model was developed through significant scaling of unsupervised learning, leveraging Microsoft Azure AI supercomputers for training. According to OpenAI, this approach has produced "a model that has broader knowledge and a deeper understanding of the world, leading to reduced hallucinations and more reliability across a wide range of topics."
Human evaluations show substantial improvements in key business use cases, with testers preferring GPT-4.5 over GPT-4o at rates of 56.8% for creative intelligence tasks, 63.2% for professional queries, and 57.0% for everyday queries.
OpenAI has developed new scaling techniques that "enable training larger and more powerful models with data derived from smaller models." These techniques have enhanced the model's ability to understand human intent, interpret nuance, and engage in natural conversation.
The company highlighted specific business applications where GPT-4.5 demonstrates superior performance:
- Writing and design assistance with "stronger aesthetic intuition and creativity"
- Professional problem-solving with improved nuance interpretation
- Customer service interactions with enhanced emotional intelligence
- Factual responses with significantly lower hallucination rates
The new model is immediately available to ChatGPT Pro users and to developers across all paid API tiers, with planned rollout to Plus and Team users next week, followed by Enterprise and Education customers the following week. Enterprise API customers can access GPT-4.5 through the Chat Completions API, Assistants API, and Batch API, with support for key enterprise functionalities including function calling, structured outputs, streaming, and system messages.
OpenAI notes that developers may find GPT-4.5 "particularly useful for applications that benefit from its higher emotional intelligence and creativity—such as writing help, communication, learning, coaching, and brainstorming." The model also demonstrates "strong capabilities in agentic planning and execution, including multi-step coding workflows and complex task automation."
However, the company cautions that GPT-4.5 is "a very large and compute-intensive model, making it more expensive than and not a replacement for GPT-4o," suggesting that organisations should evaluate the model's specific benefits for their use cases rather than implementing it as a universal replacement for existing models.
GPT-4.5's advances in factuality and hallucination reduction directly address primary concerns that have limited enterprise AI adoption. The 37.1% hallucination rate—while still significant—represents substantial progress toward making AI reliable enough for high-stakes business applications where accuracy is critical.
The model's ability to interpret user intent with greater nuance and demonstrate higher emotional intelligence makes it particularly valuable for customer-facing applications, where AI interactions directly impact brand perception and customer satisfaction. The improved conversational capabilities also reduce enterprise deployment's friction and training requirements.