I was just following what danperks suggested in a different thread:
As I mentioned, I would recommend using your own API keys while Google offers this, and with a Pro subscription, everything should work as expected here. Max mode is also free when using an API key, and uses all the context available!
Gemini 2,5 performance: Great yesterday, terrible today - #30 by danperks
It was working fine all day and then suddenly stopped, as if an update had been pushed (either front end or backend ¯_(ツ)_/¯ ) - so I’m not sure how you can say it’s not available in the Google API. Seems to conflict with other information out there.