Is GPT 5 Chat or O4 Mini Deep Research cheaper?
O4 Mini Deep Research is cheaper ($0.376 / 1M tokens input / $1.50 / 1M tokens output) vs GPT 5 Chat ($0.236 / 1M tokens input / $1.88 / 1M tokens output). Actual cost depends on your input/output token mix — estimate it with the pricing calculator.