Open-source AI-SQL engine Quail adds prefix sharing: 3x fewer tokens on 1,772 agent traces
sh_reya · x · 2026-10-08
- Shreya announced that Quail, an open-source AI-SQL engine, now supports prefix sharing, reusing computation when many LLM calls share long prefixes (same system prompt, overlapping document context).
- Benchmark: tagging 1,772 long agent traces with issue types using qwen3-4b cut computed tokens by 3x and ran the query 2.6x faster.
- Commenters highlighted the sharp part: Quail's optimizer decides on prefix sharing based on document overlap and KV-write cost, planning reuse before LLM calls arrive.
- Practical takeaway for anyone running large-scale agent evals, log analysis, or repeated long-context workloads.
Related event: Open-Source AI-SQL Engine Quail Adds Prefix Sharing(2 posts)→
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