› On 26 October 2026 I ran GPT-6.1 Terra and GPT-6.1 Sol through the same 12 tasks written in British English.
› Terra did it for $0.050, Sol for $0.103.
› In the API Terra costs half of Sol per input token and half per output token, and that difference showed up almost exactly in my bill.
› Prices per 1M tokens: Luna $0.10 / $0.50, Terra $1 / $5, Sol $2 / $10, Astra $10 / $50.