Overview
- OpenAI announced on Wednesday, Sept. 23 that it has released GPT‑6 Sol and GPT‑6 Luna as gpt-6-sol and gpt-6-luna on its API and described the new pricing as permanent, saying the move halves the promotional GPT‑5.6 price.
- OpenAI published example token prices showing Sol at roughly $2 per million input tokens and $10 per million output tokens while Luna is priced near $0.10 per million input and $0.50 per million output.
- The company opened Sol and Luna to paid ChatGPT Work and Codex tiers and to API users, and it made Luna available in desktop apps for free and Go users, with full Chat integration not yet provided.
- Vendor self‑tests and media analyses report that Sol and Luna trade some peak benchmark scores for much lower per‑task costs, with Sol and Luna often delivering similar or lower accuracy while multiplying the number of calls possible on a fixed budget.
- Anthropic released Claude Opus 5.5 in the same window claiming roughly 40% lower cost and faster output, a dynamic that market analysts say intensifies price competition and could raise demand for data‑centre compute, energy and semiconductor capacity while independent cross‑vendor benchmarks remain pending.