OpenAI widened the GPT-6 line with cheaper Sol and Luna
OpenAI announced GPT-6 Sol and GPT-6 Luna on 22 September, positioned as a cheaper pair inside the GPT-6 family, and followed with GPT-6.1 Sol on 29 September. We are deliberately not quoting per-token figures here: OpenAI's announcement pages block automated fetching, so anything we repeated would come from a third-party summary rather than the vendor, and this site does not publish numbers it has not read on the page that owns them.
The naming is the practical lesson. A family that gains variants weekly means the model named in a tool's marketing copy is a moving target — "GPT-6" on a £20 plan and "GPT-6" on a business plan may not be the same model at all. When a subscription will not tell you which variant your tier gets, that is an answer in itself.