Use DeepSeek-Reasoner for Complex Logic and 'DeepThink' Tasks
Activate DeepThink mode for complex math, coding, and logical reasoning tasks.
Switch your model selection to 'deepseek-reasoner' when you need the AI to 'think' through a problem step-by-step rather than providing an immediate, surface-level response.
The Scenario
You are faced with a complex data analysis task or a difficult coding bug that standard AI models keep hallucinating on.
Before & after
Users often manually break down math or coding problems into sub-tasks and prompt the AI repeatedly to check its work. This trial-and-error process takes 15–20 minutes.
Using 'deepseek-reasoner' triggers the thinking mode, providing a step-by-step logical breakdown. This structured response is generated in 1–2 minutes.
The Prompt
[PASTE_COMPLEX_MATH_OR_LOGIC_PROBLEM] Please use your Thinking Mode (DeepThink) to solve this step-by-step, ensuring maximum logical consistency and checking for edge cases in the final logic.
DeepSeek's V3.2 and V4 series utilize a hybrid reasoning architecture. The 'reasoner' endpoint is specifically designed for 'DeepThink' mode, which is essential for tasks requiring high logical consistency, such as competitive coding or complex data analysis.
Source
Change Log | DeepSeek API Docs"deepseek-reasoner corresponds to DeepSeek-V3.2's thinking mode... maximum reasoning power on hard problems."