Currently my daily API costs for 4o are low enough and performance/quality for my usecases good enough that switching models has not made to to the top of application improvements.
My cases' costs are more heavily slanted towards input tokens, so trying 4.5 would raise my costs over 25x, which is a non-starter.
It is more like the AI part of the system for this specific use case has reached a position where focusing on that part of the complete application as opposed to other parts that need attention would not yield the highest return in terms of user satisfaction or revenue.
Certainly there is enormous potential for AI improvement, and I have other projects that do gain substantially from improvements in e.g. reasoning, but then GPT 4.5 will have to compete with Deepseek, Gemini, Grok and Claude on a price/performance level, but to be honest the current preview pricing would make it (in production, not for dev) a non starter for me.
My cases' costs are more heavily slanted towards input tokens, so trying 4.5 would raise my costs over 25x, which is a non-starter.