Netflix Engineer Open-Sources 'Headroom' — Token Pruning Proxy That Saved $700K in LLM API Costs

The Register·medium signal

A Netflix senior engineer open-sourced Headroom, a proxy that prunes unnecessary tokens from prompts before they reach LLMs, claiming up to 90% reduction in API bills and $700K in savings at Netflix. Rather than relying on ever-larger context windows, the tool compresses prompts to minimize token waste while maintaining output quality. For builders running production AI pipelines, this is a practical cost optimization approach that could pair well with the usage-based billing shifts happening at GitHub and elsewhere.