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AI Research 84% 1 min readJun 30, 2026, 5:39 PM

AxDafny: Agentic Verified Code Generation in Dafny

Evolving story · 1 updatesAxDafny: Verifier-Guided Code Generation in DafnyTimeline →
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AxDafny introduces a verifier-guided repair framework for agentic code generation in Dafny, improving verification success over GPT-5.5 on a new benchmark (LCB-Pro-Dafny) of 250 formal programming problems.

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We study agentic code generation in Dafny, where a model must generate both executable code and the proof artifacts for verification. We present AxDafny, a verifier-guided repair framework that iteratively generates implementations, invariants, assertions, and termination arguments. We also introduce LiveCodeBench-Pro-Dafny (LCB-Pro-Dafny), a benchmark of 250 competition-style programming problems translated into Dafny with formal specifications and a verifier-based evaluation harness. On LCB-Pro-Dafny, AxDafny substantially improves verification success over baseline GPT-5.5 performance. On D

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