You don't need a ChatGPT Pro account. Screenshot to code uses API keys from your OpenAI developer account. In order to get access to the GPT4 Vision model, log into your OpenAI account and then, follow these instructions:
- Open OpenAI Dashboard
- Go to Settings > Billing
- Click at the Add payment details
- Go to Settings > Limits and check at the bottom of the page, your current tier has to be "Tier 1" to have GPT4 access
Some users have also reported that it can take upto 30 minutes after your credit purchase for the GPT4 vision model to be activated.
If you've followed these steps, and it still doesn't work, feel free to open a Github issue.