Gemini 2.0 Flash Thinking Experimental (01-21) is a snapshot of Gemini 2.0 Flash Thinking Experimental.
Gemini 2.0 Flash Thinking Mode is an experimental model that's trained to generate the "thinking process" the model goes through as part of its response. As a result, Thinking Mode is capable of stronger reasoning capabilities in its responses than the base Gemini 2.0 Flash model.