Wait where do you get the browsing model? Openai's website is quite bad at user experience but I pay for both plus and the api and can't find that anywhere.
You have to request access/waitlist for the alpha features, but I believe they're bucketing roll-outs somewhat randomly. Eg, I have browsing but I don't have plugins or the code interpreter version. Also, I still don't have GPT-4 API access (although that's through a separate business vs personal account).