GPT-3.5 for this specific example, but I've been experimenting with GPT-4 via Bing Chat and it hasn't really changed my impression. I'm going to reevaluate once OpenAI releases ChatGPT + GPT-4 for free users.

3.5 and 4 are really miles apart. The difference isn’t 10-20%. It’s 90%.

And I don’t know what they’re doing with Bing, but Bing Chat has substantially poorer results than GPT-4 via chatGPT.

If you’re in tech, you should shell out the 20 bucks to give it a try. Basic curiosity demands that at least I reckon.