Re:ChatGPT can now see, hear, and speak – openai.com
by MillionOClock on Monday September 25, 2023 @12:50PM
(#37646872)
> GPT3.5 had most of the capabilities of the initial ChatGPT release, just with a different interface
I believe two other factors were the cost (especially of fine tuned models, IIRC fine tuned davinci cost $0.20 per thousand tokens) and also that OpenAI hadn't very clearly shown just how much higher the quality could get once RLHF'd. I remember asking davinci-instruct to parse some data, and the reliability really seemed much lower than ChatGPT at launch, to the point that, at the time, I thought GPT-4 was secretly powering ChatGPT.
I believe two other factors were the cost (especially of fine tuned models, IIRC fine tuned davinci cost $0.20 per thousand tokens) and also that OpenAI hadn't very clearly shown just how much higher the quality could get once RLHF'd. I remember asking davinci-instruct to parse some data, and the reliability really seemed much lower than ChatGPT at launch, to the point that, at the time, I thought GPT-4 was secretly powering ChatGPT.