Hey thanks for pointing this out. The prices above are for GPT-4-Turbo and I should have specified. GPT-4 is considerably more expensive.

    GPT-4 (classic, 8k)  input:  $0.03
    GPT-4 (classic, 8k)  output: $0.06

    GPT-4 (classic, 32k) input:  $0.03
    GPT-4 (classic, 32k) output: $0.12

https://azure.microsoft.com/en-us/pricing/details/cognitive-...

People have generally resorted to referring GPT-4 Turbo as GPT-4 since it has been in preview for ~4 months and can mostly be used for production loads.

GPT-4 Turbo is priced $10/M Input Tokens and $30/M Output Tokens.