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GPT-4 is a large language model developed by OpenAI and released in March 2023 as part of the Generative Pre-trained Transformer series. It accepts text input and produces text output, with a context window of 8,192 tokens, and its training data has a knowledge cutoff of April 2023. GPT-4 was designed to improve on earlier GPT models in areas such as instruction following, contextual understanding, and factual accuracy across a wide range of topics.

GPT-4 Turbo is a variant of OpenAI's GPT-4 model, released to provide faster response times while retaining the language understanding and generation capabilities of the base GPT-4. It supports a 128,000-token context window, allowing it to process and reason over long documents, extended conversations, or large blocks of text in a single request. The model has a training data cutoff of December 2023 and is available through OpenAI's API.

GPT-4o is a multimodal language model developed by OpenAI, released in May 2024. The "o" stands for "omni," reflecting its ability to accept any combination of text, audio, and image as input and generate any combination of those same modalities as output. It has a 128,000-token context window and a training data cutoff of October 2023.

GPT-4o Mini is a text generation model developed by OpenAI and released in July 2024. It is designed to deliver low-cost, low-latency responses across a wide range of tasks, making it suitable for applications that require fast throughput or high request volumes. The model supports a 128,000-token context window and is compatible with the same range of languages as GPT-4o.