How I AI · Tuesday, September 22, 2026
New pricing details reveal that GPT-6 Luna is the most cost-effective of the recently released models, priced at $1 per million tokens for prompts and $3 per million tokens for completions. GPT-6 Sole is moderately priced, while Anthropic's Opus 55 is the most expensive.
“and you can see here Opus 55 is definitely the most expensive um it's $15 per million tokens for the prompt and $75 per million tokens for the completion so that's quite expensive”
“GPT 6 Sole is $2 per million tokens for the prompt and $6 per million tokens for the completion and then Luna is $1 per million tokens for the prompt and $3 per million tokens for the completion”
“so Luna is definitely the cheapest and then Sole is in the middle and then Opus 55 is the most expensive”