The "All-Knowing Expert": A Complete Look at OpenAI's GPT-5 and Its Transformative AI Capabilities

In a presentation that lasted an hour and a half, OpenAI officially unveiled its latest and most powerful language model, GPT-5. The company's CEO, Sam Altman, described this model as a paradigm shift, likening the evolution of GPT models to a learning journey: GPT-3 was like a high school student, GPT-4 was a college student, while GPT-5 represents an "expert" capable of deep analysis, precise decision-making, and providing advanced insights across various fields.

Superior Performance and Reduced Hallucinations

The company confirmed that GPT-5 outperforms all its previous versions and key competitors in benchmark tests like SWE-bench and AIME 2025. A key improvement is the significant reduction in the "hallucination" rate—a common AI flaw where models invent incorrect information. This enhancement boosts the model's reliability and accuracy, making it a more trustworthy tool for users.

Availability and Access

As of August 7, GPT-5 is available to both free and paid ChatGPT users.

• Free users: Can utilize the model with certain usage limits before being automatically switched to a lighter version called "GPT-5 mini."

• Premium subscribers ($20/month): Get higher usage limits.

• Professional users ($200/month): Enjoy unlimited access and additional features via GPT-5 Pro.

Key Innovative Features

• Multi-step Reasoning: GPT-5 has the ability to switch between a quick response mode and a "deep-thinking" mode, depending on the complexity of the question. It can display the analysis steps to the user in real-time, a feature that can be activated even on the free plan.

• Advanced Programming: OpenAI dedicated a significant portion of the event to showcasing GPT-5's impressive programming capabilities, including writing code from scratch, debugging, and designing custom websites and games. In one demonstration, the model created a complete French language learning website with an interactive game in just a few minutes.

• Greater Safety and Honesty: The company stated that GPT-5 is less deceptive than its predecessors and is better at answering sensitive questions neutrally or clearly explaining the reasons for refusal, which builds user trust.

• Leap in Healthcare: Altman promoted GPT-5 as the "best health model ever," having excelled in HealthBench tests and providing practical assistance to patients with complex diagnoses by generating targeted medical questions for their doctors and accurate information about their conditions.

• New Integrations: OpenAI has added options to customize the ChatGPT interface colors and supports integration with Gmail and Google Calendar. It also includes a new audio learning mode for slow and clear language instruction.

With this technological leap, GPT-5 is not just an update but a new turning point in the AI race, transitioning from a "smart assistant" to a "multidisciplinary expert."