pxpipe renders static prompt context as dense PNGs to cut token costs 59-70%
Steven Chong's open-source pxpipe is a local proxy that renders static context — system prompts, tool docs, older chat history — as a single dense PNG, turning roughly 25,000 text tokens into about 2,700 image tokens because Anthropic prices images by pixel size, not character count. A developer can route Fable 5 or GPT 5.6 sessions through it today for 59-70% average savings — one demo fell from $42.21 to $6.06 — at the cost of garbled exact strings like hashes and a slower vision-encoder pass.
Source: the-decoder.com ↗
Text costs roughly one token per character, but images cost a fixed number of tokens based on their pixel dimensions, no matter how much text they contain.
the-decoder.com
Why this matters
- → Cuts LLM API costs by 59-70% via image-token arbitrage
- → Exploits Anthropic's pixel-based pricing model for dense static content
- → Trade-off: accuracy loss and slower inference for major savings
Pixels over tokens