OpenAI GPT-4 API

The OpenAI API provides programmatic access to GPT-4 and the family of OpenAI models for developers building AI-powered applications. As the API that powers a significant portion of the world's AI applications, OpenAI's models represent the most widely deployed AI capabilities in commercial software products.

GPT-4 is OpenAI's most capable text model, demonstrating near-human performance on many professional benchmarks including bar exams, medical licensing tests, and academic evaluations. The model's reasoning capabilities, instruction following, and knowledge breadth make it the standard against which other AI models are measured.

GPT-4o (omni) extends the model's capabilities to native multimodality — processing text, images, and audio as inputs and producing text and audio outputs in an integrated manner. This native multimodality enables use cases that required multiple separate models previously, simplifying development and improving performance.

OpenAI's function calling feature allows GPT-4 to reliably call external functions and APIs as part of completing tasks, enabling the development of AI agents that can take actions in the real world — searching the web, querying databases, executing code, and calling business APIs — as part of natural language workflows.

The OpenAI API's extensive documentation, large developer community, and broad tool ecosystem make it the easiest starting point for most developers new to AI application development. The combination of capability, developer experience, and ecosystem support has made OpenAI's API the default choice for a large majority of AI application developers.