decolua/9router v0.4.20: AI Router Proxy With 3-Tier Auto-Fallback Across 40+ Providers at 5K Stars

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9router is an open-source AI proxy that routes requests across three tiers—subscription providers (Claude Code, Codex, Copilot), cheap alternatives (GLM at $0.6/1M tokens, MiniMax at $0.2/1M), and free options (Kiro, OpenCode Free, Vertex AI)—with automatic fallback when any tier exhausts its quota. Version 0.4.20 released May 7. RTK compression saves 20-40% tokens per request, and Caveman Mode reduces output tokens by up to 65%.