Based on the 11-2023 knowledge cutoff date, I have to wonder if it might be Llama 3 400B rather than GPT-N. Llama 3 70B cutoff was 12-2023 (8B was 3-2023).
Claude seems unlikely (unless it's a potential 3.5 rather than 4), since Claude-3 cutoff was 8-2023, so 11-2023 seems too soon after for next gen model.
The other candidate would be Gemini, which has an early 2023 cutoff, similar to that of GPT-4.
