Term
GPT-4o
GPT-4o (May 2024) was OpenAI's first natively multimodal model — text, audio and image in a single model, with a real-time voice mode and substantially lower cost than GPT-4 Turbo.
GPT-4o — explained in more detail
GPT-4o was unveiled by OpenAI in May 2024 — the “o” stands for “omni”. It was OpenAI’s first model to process text, audio and image natively in a single unified model, instead of stitching together separate models for each modality. Key features: a real-time voice mode with audibly natural response latency, multimodal input, and notably cheaper tokens plus higher throughput compared to GPT-4 Turbo.
Example / Practical context
GPT-4o was the default model of the ChatGPT app until spring 2025, making it many users’ first hands-on encounter with multimodal AI: upload an image and have it described, hold a spoken conversation, switch between voice and text in one breath. Through the API, GPT-4o was also a popular pick for cost-sensitive workloads that needed GPT-4-class quality without the GPT-4 Turbo premium.
Distinction from related concepts
Compared to GPT-4 Turbo, GPT-4o brought native multimodality and lower cost — Turbo was still text-centric. It differs fundamentally from the later o-series (o1, o3): GPT-4o answers quickly and without visible deliberation, while reasoning models first run an internal chain of thought before responding.
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