GPT-4o (OpenAI)

GPT-4o is OpenAI's flagship large language model, positioned as the successor to GPT-4 Turbo and the first in the lineup branded as "omni" to signal its unified handling of multiple content types. Unlike earlier setups that chained separate models for speech, images, and text, GPT-4o is built as a single model that can accept and reason over a mixture of text, audio, images, and video within one pipeline. This consolidation is designed to increase response speed, simplify interfaces, and open up use cases that depend on fluid cross-modal understanding.

Practically, GPT-4o fits workloads that benefit from tight multimodal integration, such as conversational assistants that need to interpret images alongside text, document and chart understanding, and interactive scenarios where latency matters. Microsoft highlighted it as a step forward in generative AI on Azure AI, noting its combination of text, vision, and audio capabilities for richer conversational experiences. A lighter sibling, GPT-4o mini, is also available for teams that prioritize speed and cost over full multimodal depth, while the full GPT-4o targets the broader flagship use cases.