GPT-5.4

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GPT-5.4 (Generative Pre-trained Transformer 5.4) is a large language model (LLM) released by OpenAI on March 5, 2026. OpenAI initially released the model in two variants, GPT-5.4 Thinking and GPT-5.4 Pro. Neither is available to free-tier users. On March 17, OpenAI released GPT-5.4 mini and GPT-5.4 nano. GPT-5.4 mini is available to free-tier users, and GPT-5.4 nano is only available via the OpenAI API. Through the OpenAI API, GPT-5.4 mini and GPT-5.4 nano are four times more expensive than their GPT-5 equivalents. In technical benchmarks, OpenAI reported a 33% reduction in factual errors compared to GPT-5.2. Performance improvements were focused on professional workflows. GPT-5.4 has built-in computer use capabilities, and improved deep research capabilities. In the benchmark OSWorld-Verified, which scores large language models' ability to use desktop environments, GPT-5.4 scored 75%, compared to GPT-5.2's 47.3% and the average person's 72.4%.