GPT4

GPT-4 is a large multimodal language model developed by OpenAI. Released in 2023 as the successor to GPT-3.5, it aims to improve language understanding, reasoning, and instruction following. Unlike some earlier models, GPT-4 is not open source; access is provided via OpenAI's API and through ChatGPT, with enterprise offerings available. The model can process text inputs and, in certain configurations, image inputs, enabling tasks that combine visual and textual information.

GPT-4 uses a Transformer-based architecture with a substantially larger capacity than GPT-3.5. It was trained on a mixture of licensed data, data created by human trainers, and publicly available data, with emphasis on better alignment and safer outputs. The model supports longer context lengths in some deployments, enabling analysis of longer documents and complex prompts. It shows strong performance in coding, mathematics, reasoning, and multi-step tasks, while remaining sensitive to input quality and instruction specificity.

Limitations and considerations include the potential for errors or biased outputs, and the fact that the model's knowledge is not updated in real time. It may generate plausible but incorrect information and can reflect training data biases. OpenAI provides safety mitigations and usage policies; users should review outputs in critical applications. GPT-4 is offered as a paid service rather than an open-source model, with access controlled through API keys, ChatGPT, and enterprise products.