Tiktoken and cost tracking issues on gpt-4o

[Nathan-Intergral]

Hey all,

I understand gpt-4o has just come out so apologies if you are already on it, just wanted to bring it to your attention. Of course you guys are on an older version of tiktoken which doesnt support gpt-4o yet, so the chain crashes when you try to run a GroupChat instance, i was able to fix this by just upgrading the dependency myself on my side.

Another issue is that your token_count_utils.py doesnt have gpt-4o of course so cost calculations dont work right now.

Any chance I could get a time estimate on when you will have a release updating these? Thanks!