ChatGPT

GPT-4o is OpenAI's latest and most capable flagship model, released in May 2024. Unlike its predecessors which processed modalities separately, GPT-4o processes text, images, and audio in a unified end-to-end neural network — enabling it to reason across modalities simultaneously with minimal latency. The model delivers GPT-4 Turbo-level intelligence while being 2× faster and 50% cheaper via the API. For developers, this makes it the clear choice for building production AI applications that need both performance and cost efficiency at scale. GPT-4o introduced real-time voice interaction capabilities — allowing back-and-forth conversation with response times as low as 232ms (similar to human response time). It can detect emotion, sing, and maintain consistent voice personas. This made it the first model to pass the Turing test in live voice conversations according to independent researchers.