9Router

9Router's RTK (Rust Token Kompressor, ported to JavaScript) intercepts every tool_result in your prompt before it is dispatched to the LLM. It peeks at the first kilobyte of data, identifies the content type (git diff, log dump, file tree, grep output), and applies targeted lossless filters. The result is 20 to 40 percent fewer input tokens per request with absolutely no loss of context. If a filter fails or makes output larger, RTK silently discards it so your request is never broken.

The fallback engine is the beating heart of 9Router. You configure a “Combo” that chains up to five model tiers: your active subscription (e.g. Claude Code Pro at $20 per month), a cheap backup (e.g. GLM at $0.60 per million tokens), and a free unlimited provider (e.g. Kiro AI). The instant a rate-limit or quota-exhausted error is detected, 9Router catches it silently and re-routes the exact same request to the next tier. Your coding tool never sees the switch.

Inspired by the viral “why use many token when few token do trick” prompt by Julius Brussee, Caveman Mode injects a system-level instruction that forces the LLM to respond in terse, stripped-down language. The technical substance of the reply is preserved in full, but verbose filler is dropped, delivering up to 65 percent fewer output tokens. For high-volume agentic coding workflows, this alone can eliminate a meaningful chunk of monthly API expenditure.

9Router acts as a universal protocol translator. Your CLI tool sends a standard OpenAI JSON request to localhost, and 9Router unpacks it, restructures it into the native format of the destination provider (Claude, Gemini, Vertex, Kiro, Cursor), fires it off, then translates the response back into OpenAI format before handing it to your tool. The result is that Claude Code, Codex, Cline, Roo, and 12 other supported CLI tools all route through a single configuration point.

9Router's dashboard provides live token consumption data, reset countdowns (5-hour, daily, weekly), and per-model cost estimation. Multi-account round-robin per provider lets you load-balance across multiple accounts so one hitting its limit does not stall the entire stack. OAuth tokens are refreshed automatically in the background so there is no manual re-authentication during active sessions.

9Router ships with first-class support for three genuinely free providers: Kiro AI (free unlimited Claudio 4.5, GLM-5, MiniMax via AWS/Google OAuth), OpenCode Free (no auth, models auto-fetched), and Vertex AI ($300 Google Cloud credits for new accounts). Combined with RTK, a developer using only the free tier pays exactly $0 per month while still accessing production-grade models like Claude Sonnet 4.5.