API usage of Flash 2.0 is free, at least till you hit a very generous bound. It's not simply a trial period. You don't even need to register any payment details to get an API key. This might be a reason for its popularity. AFAIK only some Mistral offerings have a similar free tier?
Yeah, that's my use case. When you want to test some program / script that utilizes an llm in the middle and you just want to make sure everything non-llm related is working. It's free! just try again and again till it "compiles" and then switch to 2.5