Compares the 7 best Gemini cost optimization tools for 2026 across context caching, Flash-Lite routing, batch mode, and pricing. The reviewed tools are Amnic, Portkey, Helicone, LiteLLM, OpenRouter, Cloudflare AI Gateway, and Langfuse, split into gateways/routers that cut costs at request time and FinOps layers that attribute and report spending.