GPT-4o (Fast)

GPT-4o is OpenAI's flagship "omni" model, announced on May 13, 2024, as the direct successor to GPT-4 within the same Transformer-based family. The "o" in its name signals that a single neural network was trained natively across text, vision, and audio rather than bolting separate modalities together, which distinguishes it from GPT-4's earlier text-and-image configuration. Coverage from the launch window highlighted its near-human response speeds, including audio inputs processed in roughly 232 milliseconds, and its use as the default general-purpose model in ChatGPT at the time. This cataloged entry is surfaced through a gateway routing alias rather than a separately released OpenAI variant, so the underlying capabilities are those of the standard GPT-4o model.

Practically, GPT-4o is positioned for versatile, general-purpose work where multimodal understanding matters: it can take in text and images, reason across them in context, and return text outputs at high speed. Its the cataloged API limit context window allows it to keep long documents, transcripts, or multi-turn conversations in working memory without external retrieval, which suits tasks like document analysis, code review with attached snippets, and structured data extraction from mixed-format inputs. For developers, the model fits workflows that need a balance of strong reasoning, broad modality coverage, and low-latency responses, though it has since been succeeded within ChatGPT's default lineup by newer generations while remaining a useful multimodal reference point.