RTK reports token savings, but our cost benchmarks disagree

一句话概要

We tested RTK (Rust Token Killer) with Claude Code on Fable 5.0, and OpenCode with DeepSeek V4 Pro 0813 on Terminal-Bench 2.1.

原文开头节选

Download PNG Hacker News front page · 11 September 2026 RTK (Rust Token Killer) filters and compresses terminal output before the AI agent reads it. With over 79k GitHub stars today, RTK is one of the most popular tools to make AI coding cheaper.

One X post saying RTK could cut Claude Code tokens by up to 60% reached 313K views.

RTK cuts up to 90% of the bash output your agent reads. […] it is not the same as cutting your bill by 90%.

So “less terminal output” is not the same as “cheaper AI coding”. It can help, be a no-op, or backfire (more turns or lower quality). In this post, we present our findings after several days and over $1,500 spent on tokens.

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