I am unable to use GPT 4 in ai task (greyed out for me). Is it not yet available to be used ?

Correct! OpenAI hasn't allotted a very high rate limit for GPT4 for us (yet! we're working on it!). So while we plan to open AI tasks up to more models, we're not quite there yet

Okay , thank you

Anyway we can workaround this by allowing us to use our own API key? (For those that are happy to)

can you give an estimate for when will GPT 4 be available or is it unlikely to be in the near future?

You can follow this feature request for more info https://discord.com/channels/1108396290624213082/1129080792870559774