What do you use for multi-user ChatGPT?

I'm looking to work with some friends on a coding project and instead of each of us working with our own gated off ChatGPT and then having meetings to share progress, cool prompts, etc I thought it would be easier to just have everyone in one big chat talking about the project and bringing in GPT for ideas and code generation when needed.

Has anyone used something like this? Can you do this with Slack? How do people collaborate with GPT - is it just everyone using their own ChatGPT and then talking about it in meetings and on slack?