GPT-4 API pricing starts at $0.10 per 1M input tokens (GPT-4.1 nano) and tops out at $60.00 per 1M output (legacy GPT-4). See the complete 2026 model family breakdown, real cost examples, and the fastest path to cutting your AI spend. The post GPT-4 API cost 2026: pricing breakdown and how to estimate it appeared first on CloudZero .