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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-4.1 is a text generation model developed by OpenAI and released in April 2025. It is positioned as OpenAI's flagship model for handling complex, multi-domain tasks and is available to developers via the OpenAI API. The model supports a 200,000-token context window, enabling it to process and reason over long documents, codebases, and extended conversations in a single request. Its training data has a knowledge cutoff of May 31, 2024.

GPT-4.1 Mini is a text generation model developed by OpenAI, released as part of the GPT-4.1 model family in April 2025. It is designed to occupy a middle ground between the full GPT-4.1 model and lighter-weight options, offering a context window of over one million tokens — specifically 1,047,576 tokens. The model has a training data cutoff of May 31, 2024, and is accessible via the OpenAI 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.