Gemini is the undisputed king of context window and price-to-performance ratio. If you need to dump a 500-page PDF or a 1-hour video into a prompt, this is literally the only tool that does it reliably without breaking the bank. Use Gemini 1.5 Flash for dirt-cheap, high-speed tasks ($0.075/1M input) and 1.5 Pro for deep reasoning. Avoid it if you need sub-100ms latency on complex reasoning or strict determinism, as the safety rails can be finicky.
