Claude Code bill from $42 to $6? The viral pxpipe trick turns prompts into images, but the headline number came from an older model

pxpipe, an open-source proxy that turns the long system prompt Claude Code resends every turn into a single image to cut input tokens, went viral, but its headline savings were measured on the original Fable 5 from June, not today's main models.

X user bebu (@bebuu_ai) posted on Nov. 12 that pxpipe cut a real Claude Fable 5.2 coding session from $42.21 to $6.06, drawing about 600 likes. The idea: Claude Code resends about 48,000 characters of system prompt, CLAUDE.md and tool schemas each turn (about 25,000 text tokens). pxpipe renders them as a dense PNG costing about 2,700 image tokens, because image tokens are priced by pixels, not by how much text they hold. The repo has 7,700 GitHub stars.

But the README says the $42.21-to-$6.06 run used the original claude-fable-5. It reports that Opus 5.5, Sonnet 5.5 and Haiku 5.5 regressed sharply at reading dense text images, scoring 0 to 3 out of 15, while Fable 5.1 and 5.2 reach 11 to 14 only with wider row spacing. Only Gemini 4 Argon scored 15 out of 15, and Haiku and Sonnet 5.5 are left out entirely.

Replies pushed back: "You are going to very severely mess up performance by doing this. If you're fine with that why not just use a Chinese model instead" (29 likes), and "context quality is degraded." The README itself says it only wins on dense content like code and JSON, can lose money on plain prose, and typically saves 60 to 70% in Claude Code. Per the README, you start the proxy with `npx pxpipe-proxy` and launch Claude Code through `pxpipe warp -- claude`.