Input-process-output (I-P-O) is a structured methodology for capturing and visualizing all of the inputs, outputs, and process steps that are required to transform inputs into outputs.

For prompts up to 200,000 tokens, Gemini 2.5 Pro costs $1.25 per million input tokens (roughly 750,000 words, longer than the entire “Lord of The Rings” series) and $10 per million output tokens.

GPT-4.5 costs $75 per million input tokens and $150 per million output tokens through the API, compared to GPT-4o's $2.50 per million input tokens and $10 per million output tokens.