# Over $1,500 in tests found RTK output cuts may not lower AI coding costs > Source: > Published: 2026-09-13 07:57:33.699146+00:00 [Hacker News](https://quesma.com/blog/does-rtk-make-ai-coding-cheaper/) ### Over $1,500 in tests found RTK output cuts may not lower AI coding costs Which summary reads better? Pick one — models revealed after.Both summaries are AI-generated. RTK, a popular tool for compressing terminal output, resulted in only a 5% cost reduction for Claude Code with Fable 5.0 and actually increased costs by 5% for OpenCode with DeepSeek V4 Pro 0813 in recent benchmarks. This discrepancy highlights that simply reducing token count does not directly translate to cost savings, potentially impacting the cost-effectiveness of AI coding workflows. Engineers running LLMs in production should reassess the value of such token-saving tools in their specific use cases. RTK's terminal output compression showed mixed results: costs dropped by 5% with Claude Code but increased by 5% with OpenCode, highlighting that token savings don’t consistently translate to lower expenses. Engineers must rigorously test RTK in their specific workflows, as its impact varies by model and task, potentially increasing costs or reducing efficiency rather than delivering promised savings.