GPT-5.4 Mini

GPT-5.4 Mini is OpenAI's lightweight model in the GPT family, positioned as a cost-effective alternative to the full GPT-5.4 model. As a tier-down option, it provides balanced capabilities at reduced computational requirements while maintaining OpenAI's core architecture and training approaches. The model supports both text and image inputs with a 128,000 token context window, enabling multimodal processing for documents, visual content analysis, and extended conversations. Unlike its larger sibling, GPT-5.4 Mini does not include tool calling capabilities, focusing instead on direct text generation and image understanding tasks. This streamlined feature set makes it suitable for applications where advanced function calling is not required. GPT-5.4 Mini serves users who need reliable language model performance without the overhead of flagship-tier capabilities. It competes with other lightweight models in the market by offering OpenAI's training quality and multimodal support at a more accessible resource profile, making it practical for higher-volume deployments where cost efficiency is prioritized alongside capability.