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OpenAI Releases GPT-5.4 with Enhanced Professional Capabilities and 1M Token Context Window

OpenAI launched GPT-5.4, its most capable foundation model optimized for professional work, available in standard, Pro, and Thinking (reasoning) versions. The model features a 1 million token context window, record-breaking benchmark scores including 83% on professional knowledge work tasks, and 33% fewer factual errors compared to GPT-5.2. New safety evaluations show the Thinking version is less likely to engage in deceptive reasoning, supporting chain-of-thought monitoring as an effective safety tool.