GPT-4
GPT-4 was released on March 14, 2023, and is the latest milestone in OpenAI's efforts to scale deep learning. GPT-4 is a large multimodal model accepts image and text inputs and emits text outputs that, while not as capable as humans in many real-world scenarios, demonstrates human-level performance on a variety of professional and academic benchmarks. For example, GPT-4 passed a simulated bar exam with a score in the top 10% of test takers; in contrast, GPT-3.5 scored in the bottom 10%.
OpenAI spent 6 months iteratively tuning GPT-4 using the panama mobile database adversarial testing procedure and lessons learned from ChatGPT, resulting in the best results ever achieved in terms of realism, manipulability, and rejection of guardrails although far from perfect.
Reinforcement learning is a machine learning method that enables an agent to learn optimal strategies in the process of interacting with the environment. Starting with GPT-3, reinforcement learning is used to optimize the model's generation strategy. By using reinforcement learning, the GPT model can dynamically adjust its generation strategy based on given feedback such as rewards or penalties to generate higher quality text content.