Introducing GPT-6 Sol and Luna
The models cut API prices by 50% compared to GPT-5.6, costing $2/$10 per million tokens for Sol and $0.10/$0.50 for Luna.
- Available immediately in the API as gpt-6-sol and gpt-6-luna, as well as in ChatGPT Work and Codex for paid tiers.
- Free and Go users can access GPT-6 Luna in the desktop app.
- Prompt caching now offers 90% discounts on cached input reads and survives changes to reasoning effort or tool availability mid-conversation.
- OpenAI added a Prompt Caching Dashboard, diagnostic tools, and explicit cache breakpoints to manage prefix caching.
Developers and ChatGPT subscribers gain access to faster, lower-cost frontier models for coding and long-context agentic workflows.
