The Final Shift

Lead Story · IEEE Spectrum AI

Timing Trick Cuts Energy Used in LLM Training by Up to 14 Percent

OpenAI’s fourth large language model (LLM), GPT-4, took an estimated 50 Gigawatt-hours to train, or the equivalent of 5,000 American homes‘ yearly power consumption. That was in 2023. Since then, the computational resources used to train frontier LLMs have only increased, though direct power usage numbers are hard to come by. Now, a research group at University of Twente in the Netherlands has shown that you can save up to 14 percent of the energy used in LLM training without sacrificing speed b

Jun 10, 2026