The latest AI models from the likes of OpenAI and Google are expensive and it can be tempting to use the free versions to save money, but they do tend to lack some of the latest features found in the paid-for versions.
However, the free versions of AI tools remain very useful and more than adequate for many users.
Even the paid-for versions of AI tools, while having more features, may not be worth the money as they can still require carefully crafted prompts to generate the desired responses, and these tools can still make mistakes.
It is recommended to use a combination of free AI tools to get the best results, as each tool has different features that the others lack.
Using different tools may help you to choose the best response to your prompt.