Toggle Between Thinking and Chat Modes for Complex Problem Solving
Choose the reasoner model for tasks requiring intense logical depth.
Use the 'deepseek-reasoner' model endpoint (Thinking Mode) instead of the standard chat model for tasks involving complex logic, coding, or math.
The Scenario
You are faced with a complex software architecture decision or a difficult mathematical proof that requires step-by-step verification.
Before & after
Previously, you would manually verify logic steps or use 'deepseek-chat' and hope the first response was correct, often requiring 15–20 minutes of manual debugging.
By calling the 'deepseek-reasoner' model, the AI performs internal Chain-of-Thought (CoT) to solve the problem. This takes 1–2 minutes for execution and provides a high-accuracy result.
The Prompt
[ACTIVATE_REASONER_MODE] Explain the logical steps and provide a solution for the following complex architectural problem: [INSERT_COMPLEX_PROBLEM]
DeepSeek-V3.2 separates its capabilities into two modes: 'chat' for fast, conversational tasks and 'reasoner' for deep logical thinking. Use the reasoner endpoint when precision and multi-step logic are more important than speed.
Source
Change Log | DeepSeek API Docs"deepseek-reasoner corresponds to DeepSeek-V3.2's thinking mode."