guidegemini pro apigemini 3.1 progoogle ai apigemini pricingfrontier reasoning modelGemini Pro API Guide: Pricing & When to Use Gemini 3.1 ProA practical Gemini 3.1 Pro API guide — Google's frontier reasoning model at ~$2/$12 per million tokens. Pricing, the context cliff, benchmarks, and when Flash beats it.2026-07-10claire-lowe
