Plants don't thrive in pots. They need a larger, more airy space. It's best to plant them in soil, as you did. They'll receive better sunlight.
The tomatoes are looking good. You'll likely get the best results from them. They'll need staking support when they get a little bigger.
With the right soil you nearly can get everything growing, i also had a butternut pumpkin in a big pot, surrounded by lots of flowers and this one also gave me 3 perfectly grown butternut pumpkins, could have been more and more space is better for sure, no discussion about this - but in the end it works if done properly, at least with the big pots you can see on the following picture for example, 80l to 120l were used if i remember correctly atm.
Mostly seen at construction sites.^^
They look even better right now, at least besides the fact i did not have time to take care properly, so they have grown a little wild, but no problem. :) As said, it's a lot each day. Yesterday it was about 30 big flesh tomatos besides at least 50 smaller ones of different types. :)