API
Jul 30, 2026
GPT-5.6 price reductions and Fast mode for the API
Starting July 30, GPT‑5.6 Luna costs 80% less, while GPT‑5.6 Terra costs 20% less. We’re also introducing Fast mode in the API, which replaces our Priority Processing offering. For GPT‑5.6 Sol, Fast mode now delivers up to 2.5× faster speeds than standard processing at twice the price. This change is backward compatible: requests tagged priority will automatically use Fast mode.