Batch Inference for Everyone: A Friendly Guide to openai-batch Imagine having to summarize 100,000 e-mails or classify 500,000 product reviews. Calling an AI model one request at a time is slow, expensive, and quickly hits rate limits. Batch processing changes the story: you bundle every request into a single file, send it to the cloud, and let the model work through the queue while you sleep. In the next few minutes you will meet openai-batch, a tiny Python library that turns “upload → wait → download” into three short lines of code. The examples work with both OpenAI (GPT-4o, GPT-3.5-turbo, …