One last question. How about the pricing?
Frankie Chat has all the latest models from OpenAI, like GPT 4.1, o3 and o4-mini.
We also have DeepSeek V3 and R1, Grok 3 and starting today Anthropic Claude 4 sonnet and 3.5 haiku.
Try it out: signin with nostr, recharge with sats: https://www.frankie.tools

Discussion
They are priced against the actual model pricing exposed by OpenAI and the rest.
With some surplus, obviously, that I keep.
The best info I can give is my own "bill" as a user since August 5 2023 when it got live. Purchased 40 USD, spent 26.
That's 26 USD in almost 22 months of usage, and I use it pretty much, for coding and what not.
Your mileage may vary but we're talking just over 1USD per month :)

Looks cool, if the actual use is frequent enough. Average number of prompt? Approximately..?
I do not have stats on hand, my bad.
But I can go from 2-3 conversation per day on a lousy day, to 12-14 on an average productive one.
Each conversation has multiple prompts.
I am adding the web search models today, I will try and get more stats on usage "soon" :)