OpenAI Cuts GPT-5.6 Luna by 80% and Terra by 20%

OpenAI repriced two of the three GPT-5.6 tiers on 30 July, taking Terra to $2 per million input tokens and $12 output, and Luna to $0.20 and $1.20 — cuts of 20% and 80% respectively. Sol, the flagship, is unchanged at $5 and $30. The company’s framing is price-performance rather than capability: it claims Luna now matches what was frontier-class a year ago at roughly six cents on the dollar per task and nearly nine times the speed. Nothing about the models changed. What changed is which workloads are affordable to run at volume, and long-horizon agent runs are the obvious beneficiary.