OpenAI ChatGPT 5.4 nano, the smallest and fastest 5.4-family model. Ideal for tight-loop tools (classification, routing, formatting) and high-volume chat. Ultra-low latency and the lowest per-token price in the family. If you need to search the web for information, please turn on the "Web Search" switch. Maximum context window (input and output combined): about 400,000 tokens. Maximum total input per request (including history): 272,000 tokens. Maximum output per reply: about 128,000 tokens (model reasoning, if any, counts toward this limit). Maximum total upload size per request: 256MB (all files and message content combined). Accepted document formats: pdf, docx, xlsx, pptx, txt, csv (file content is provided to the model as extracted text). Accepted image formats: gif, jpeg, jpg, png, webp. Maximum number of images: 1500. Maximum size per image: 50MB. Maximum total image size per message: 384MB (text and history share the same request size limit; uploads close to the limit may still be rejected). Image dimensions: 200 to 8,000 pixels per side. Maximum image resolution: 36,000,000 pixels in total. Output content formats: Text/Image This module supports continuous conversations. AI can make mistakes. Please verify important information.