I came across two LLM based tactics for Lean
llmstep: [L]LM proofstep suggestions in Lean LeanInfer: Neural Network Inference in Lean 4 They both use [LeanDoj
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This was posted a while back on the Lean Zulip:
LeanDojo
LeanDojo: Theorem Proving with Retrieval-Augmented Language Models According to their description, LeanDojo is an open-source Lean play
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