I asked DeepSeek R1, Gemini 2.0 Flash Thinking, and o1-pro the best move for black. Responses:

DeepSeek: d5
Gemini: Nxg6
o1-pro: "No move—White’s 3 Qg6 is illegal" (?!?)

These are all very bad answers but DeepSeek wins for at least understanding what counts as a legal move.