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pxpipe

Local proxy that renders bulky LLM request context as PNGs to cut input tokens

Repository on GitHub ↗ (opens in a new tab)
Stars
7.5k
License
MIT
Last commit
Oct 2026
Last release
Sep 2026
Language
TypeScript

Missed the latest GitHub check; these facts may be older.

Overview

pxpipe sits between Claude Code (or Codex, cursor-agent, and other clients) and the provider API. It rewrites the system prompt, tool docs and older history into dense PNG pages plus a bounded factsheet before the request leaves the machine. It handles Anthropic Messages, OpenAI Responses/Chat Completions and Google generateContent, and logs measured savings against a count_tokens counterfactual.

Who it is for: Heavy Claude Code users trying to cut input-token spend

Strengths

  • Savings measured per request against a count_tokens probe, logged to ~/.pxpipe/events.jsonl
  • Reported ~59-70% lower end-to-end bill on Claude Code traffic; SWE-bench Lite 10/10 both arms
  • Profitability gate leaves sparse prose and recent turns as text
  • Also offers offline PNG export, a library API and a dashboard on 127.0.0.1:47821

Weaknesses

  • Lossy: exact 12-char hex recall 13/15 on Fable 5, 0/15 on Sol; misses are silent
  • No verbatim-risk guard yet; IDs and hashes must stay text
  • Default model scope is limited: Fable 5, Opus 5.5 and Gemini; others opt-in
  • SWE-bench Pro showed 14/19 vs 15/19 text; small samples, and the README says savings depend on workload

What it needs

  • no GPU
  • Docker + Compose
  • Needs Node.js, Anthropic, OpenAI-compatible or Google API access
  • Models: claude-fable-5, claude-opus-5-5, claude-opus-5, Gemini 3.6/3.7 Flash, gpt-5.6-sol (opt-in)
  • port 47821

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