OpenAI cuts GPT-5.6 prices up to 80 percent as the inference cost war intensifies

OpenAI slashed GPT-5.6 Luna by 80 percent and Terra by 20 percent, crediting GPU kernel gains and a 15 percent jump in token efficiency rather than weaker demand. The move follows Moonshot open weight Kimi K3 and signals a widening price war that keeps pushing enterprise inference costs down.