Typically, reasoning models are not good at creative tasks, and vice versa: models good at creativity (like GPT-4.5) tend to be bad at reasoning, especially when zero-shot prompting—users expecting to do everything in one single command—is involved.
No doubt provoked by its new-found competition with DeepSeek, whose surprise launch recently demonstrated its superior AI model available for free and open source, OpenAI announced today that GPT-5 will be available through ChatGPT's free tier.