OpenAI Introduces GPT-5 — the Company's Smartest Chatbot with Built-in Reasoning

OpenAI has officially unveiled its new GPT-5 model. The new system combines advanced reasoning capabilities with multimodal intelligence in a single model, replacing GPT-4o as the primary model for ChatGPT. The model will determine when to respond quickly and when to analyze the query more deeply for an expert-level response.

Key improvements to GPT-5 span several areas. The model has become the most powerful of the company’s code generation models, especially for complex front-end development and debugging large repositories. The system can create beautiful and responsive websites, apps, and games from a single prompt, demonstrating a better understanding of design, indentation, and typography.

In healthcare, GPT-5 achieved the highest scores of all models on the HealthBench benchmark, scoring 67.2% on standard tests and 46.2% on the most complex tasks. The model can provide more accurate recommendations by adapting to the user's context.

Significant progress was made in mathematical abilities - GPT-5 achieved 94.6% accuracy in the AIME 2025 competition without using tools, which is 33.6 percentage points better than GPT-4o. In programming, the model showed 74.9% success on the SWE-bench Verified compared to 30.8% in the previous version.

OpenAI also introduced GPT-5 pro, a variant with advanced reasoning capabilities for the most complex tasks. In tests on over 1,000 real-world tasks, external experts preferred GPT-5 pro 67.8% of the time, noting that the model made 22% fewer serious errors.

An important achievement was the reduction of hallucinations - false responses from the AI. GPT-5 produces 45% fewer factual errors compared to GPT-4o, and in reasoning mode - 80% fewer than the previous model o3.

The new Safe completions system allows the model to provide the most useful answers within safety limits, instead of completely refusing to answer potentially dangerous questions. The company also notes that GPT-5 has become less insinuating.

Users get access to four new pre-configured chatbot personalities: Cynic, Robot, Listener, and Nerd, which allow you to customize your communication style without writing your own queries.

GPT-5 is available to all ChatGPT users with varying limitations depending on the subscription plan. Free users will have limited access with a rollover to GPT-5 mini after the limit is exhausted, while Plus and Team subscribers receive significantly higher usage. Pro users have unlimited access to GPT-5 and exclusive access to GPT-5 pro.