OpenAI has reduced the cost of its GPT-5.6 Luna and Terra models while introducing a new "Fast mode" for GPT-5.6 Sol to improve performance per dollar across enterprise workloads.
- GPT-5.6 Luna pricing is reduced by 80%, costing $0.20 per million input tokens and $1.20 per million output tokens starting July 30.
- GPT-5.6 Terra pricing is reduced by 20%, costing $2 per million input tokens and $12 per million output tokens on the same date.
- Fast mode for GPT-5.6 Sol delivers up to 2.5× faster speeds than Standard processing at twice the price, replacing the Priority Processing offering.
- Luna performance is comparable to frontier-class models from a year ago at roughly 6 cents on the dollar per task and nearly nine times the speed.
- Usage of Luna and Terra now consumes fewer credits in ChatGPT Work and Codex subscriptions for Plus, Pro, Business, and Enterprise users.
These updates allow businesses to optimize the balance between intelligence, speed, and cost by applying the appropriate model tier to different stages of their workflows.