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OpenAI Releases GPT-5.4 Mini and Nano, Ushering In the Subagent Era

Mini is recommended for applications requiring coding, reasoning, multimodal understanding, and tool use. Nano is optimized for classification, data extraction, ranking, and agent subcomponents

OpenAI Releases GPT-5.4 Mini and Nano, Ushering In the Subagent Era
Negotiate the Future - 3/20/26
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