I am very much looking forward to, but also dreading, testing gpt-4-turbo as part of my workflow and projects. The lowered cost and much larger context window are very attractive; however, I cannot be the only one who remembers the difference in output quality and overall perceived capability between gpt-3.5 and gpt-3.5-turbo, combined with the intransparent switching from one model to the other (calling the older, often more capable model "Legacy", making it GPT+ exclusive, trying to pass of gpt-3.5-turbo as a straight upgrade, etc.). If the former had remained available after the latter became dominant, that may not have been a problem in itself, but seeing as gpt-3.5-turbo has fully replaced its precursor (both on the Chat website and via API) and gpt-4 as offered up to this point wasn't a fully perfect replacement for plain gpt-3.5 either, relying on these models as offered by OpenAI has become challenging.
A lot of ink has been spilled about gpt-4 (via the Chat website, but also more recently via API) seeming less capable over the last few months compared to earlier experiences and whilst I still believe that the underlying gpt-4 model can perform at a similar degree to before, I will admit that purely the amount of output one can reliably request from these models has become severely restricted, even when using the API.
In other words, in my limited experience, gpt-4 (via API or especially the Chat website) can perform equally well in tasks and output complexity, but the amount of output one receives seems far more restricted than before, often harming existing use cases and workflows. There appears a greater tendency to include comments ("place this here") even when requesting a specific section of output in full.
Another aspect that results from their lack of transparency is communicating the differences between the Chat Website and API. I understand why they cannot be fully identical in terms of output length and context window (otherwise GPT+ would be an even bigger loss leader), but communicating the Status Quo should not be an unreasonable request in my eyes. Call the model gpt-4-web or something similar to clearly differentiate the Chat Website implementation from gpt-4 and gpt-4-1106 via API (the actual name for gpt-4-turbo at this point in time). As it stands, people like myself have to always add whether the Chat website or API is what our experiences arise from, while people who may only casually experiment with the free Website implementation of gpt-3.5-turbo may have a hard time grasping why these models create such intense interest in those more experienced.