Aclsrw2026

Our paper, “Conformal LLM Routing with Distribution-Free Safety Guarantees”, has been accepted at the Student Research Workshop of the 64th Annual Meeting of the Association for Computational Linguistics (ACL 2026). We route queries between a cheaper and an expensive LLM using a conformal gate: a lightweight predictor trained on text embeddings, calibrated with Clopper-Pearson conformal prediction to guarantee that the violation rate among routed queries stays below a target tolerance. To our knowledge, this is the first input-based LLM router with distribution-free safety guarantees.