Gemini 2.5 Pro
Best quality. Slowest (2-5s first token). Most expensive ($1.25/$5 per M tokens). Use for: hard reasoning, tool orchestration, complex prompts.
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Gemini 2.5 Flash
Balanced. Fast (400-800ms first token). Cheap ($0.075/$0.30 per M tokens). Use for: chatbots, most agents, high-volume tasks.
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Gemini 2.5 Flash-Lite
Cheapest. Fastest. Least capable. Use for: classification, extraction, simple summarization.