Google made Gemini 3.5 Flash free.
No credit card, no nothing. Head to aistudio.google.com, create an API key, and plug it into any client with Gemini provider support.
It's their strongest model right now. 1M token context. Text, images, audio, video all go in.
Free tier rate limits are dynamic but fine for daily dev use. The catch: anything you send through the free tier gets used for training, so don't feed it anything sensitive.