272k.txt -

The 272K.txt reference relates to a 272,000 input token threshold for GPT-5.4 models, which serves as the cap for standard pricing. Exceeding this limit triggers higher pricing rates, while the GPT-5.5 Thinking model operates with a 272K input and 128K output configuration. Read the full details on the OpenAI API documentation . GPT-5.4 Model | OpenAI API