OpenAI ChatGPT 5.5 is the newest flagship (GPT-5.5) with a 1,050,000-token context window and up to 128,000 tokens of output. Better reasoning, creative writing, coding, and multimodal understanding than 5.4. Best for very long documents, large codebases, and long-form generation. For everyday tasks, 5.4 mini or nano is cheaper. If you need to search the web for information, please turn on the "Web Search" switch. Prompt example 1: (Upload a full novel draft, docx) Check whether the main characters develop consistently, and list plot contradictions and parts that could be strengthened. Prompt example 2: Write a short story of about 1,500 words titled A Convenience Store on a Typhoon Night, with three characters and a surprising ending. Prompt example 3: Plan a 12-week Intro to Data Analysis course, listing each week's topic, learning goals, practice assignment and assessment method. Prompt example 4: (Upload a 300-page doctoral dissertation, PDF) Rewrite it as a ten-part column series for general readers, about 700 words each, with a title and a one-line teaser. Prompt example 5: Create the world setting, six character profiles and the storylines of three levels for a puzzle board game set in an old Taiwanese street. Prompt example 6: Write a 15-minute stage play about the last day of an old bookstore before it closes, with scene directions and dialogue. Prompt example 7: Write a browser Snake game in JavaScript with scoring, difficulty levels and a high-score record, all in one HTML file, plus an explanation of the code. Prompt example 8: (Upload ten travel photos, jpg) Write a travel essay of about 1,200 words based on the photos, and add a one-line caption for each photo. Prompt example 9: (Upload transcripts of three meetings, docx) Trace how the decisions evolved across the meetings, mark issues that kept changing, and write a briefing for managers who missed them. Prompt example 10: For our company's 20th anniversary, write a short poem and a two-minute speech about the challenges our team overcame and how we grew together. Maximum context window (input and output combined): about 1,050,000 tokens. Maximum total input per request (including history): 922,000 tokens. Maximum output per reply: about 128,000 tokens (model reasoning, if any, counts toward this limit). Maximum total upload size per request: 512MB (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 Pricing: High Fast Mode: uses 2.5x credits Continuous conversation: Supported AI can make mistakes. Please verify important information.