OpenAI Launches GPT-5 and Open-Weight Models

OpenAI has officially launched GPT-5, touting it as the company's most advanced AI model, now accessible to all ChatGPT users, including those on the free tier. GPT-5 offers enhanced reasoning, faster and more accurate responses, and improved capabilities in coding, writing, and health, integrating all major OpenAI tools such as web search and image generation. The model introduces reduced hallucinations, clearer explanations of limitations, and 'safe completions' for risky queries. GPT-5 is available in multiple variants via API, allowing for tailored performance and cost, and is deployed across platforms including Microsoft Azure and GitHub Copilot. Alongside GPT-5, OpenAI has released open-weight models (gpt-oss-120b and gpt-oss-20b) optimized for consumer GPUs, aiming to broaden accessibility. While OpenAI highlights advances in cybersecurity and customizability, the real-world robustness and security of these models are ongoing concerns.