Amazon Nova Experimental Chat 12-10 is a proprietary large language model developed by Amazon. Introduced in December 2024, it represents an experimental iteration of the Amazon Nova foundation model family, specifically optimized for conversational performance and dialogue-heavy tasks. The model gained visibility through its performance in public benchmarks such as the LMSYS Chatbot Arena, where it demonstrated competitive capabilities within the Nova architecture framework. As part of the Nova series, this model is designed to deliver high reasoning capacity and efficient response times. While specific parameter counts and architectural details are not publicly disclosed by Amazon, the model follows the series' design goals of providing frontier-level intelligence with specialized tuning for chat applications. This experimental release allows for the testing of conversational quality and logic enhancements before they are potentially integrated into the core Nova model lineup, which includes the Micro, Lite, Pro, and Premier tiers.