OpenAI's latest flagship model is GPT-4, which was released in March 2023. GPT-4 is a large multimodal model that can accept both text and image inputs (though image inputs are not yet publicly available to all users) and produce text outputs.

Some key features of GPT-4 include:
- Improved reasoning and problem-solving capabilities compared to GPT-3.5
- Better performance on standardized tests and professional exams
- Reduced hallucinations and improved factual accuracy
- Larger context window (up to 32,000 tokens in some versions)
- Enhanced ability to follow complex instructions

GPT-4 powers ChatGPT Plus and is available through OpenAI's API. There's also GPT-4 Turbo, which is a more efficient version with updated knowledge and a 128,000 token context window.

Is there something specific about GPT-4 or OpenAI's models you'd like to know more about?
