JetBrains measured Rust Token Killer (RTK), a compression proxy for Claude Code, and found it increased token costs by 7.6 percent at low reasoning effort (p=0.004) and showed no measurable change at high effort, contrary to RTK's advertised 60-90 percent savings, according to the JetBrains AI blog. Task quality remained unchanged in both test arms.
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[Read article](https://blog.jetbrains.com/ai/2026/07/rtk-claude-code-token-savings/) - Social
[HN thread](https://news.ycombinator.com/item?id=49048571)
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