Activate High-Logic Reasoning with DeepSeek-Reasoner
Enable the reasoner model for deep logic and coding tasks.
Switch from the standard chat model to 'deepseek-reasoner' when you need the AI to 'think' step-by-step for complex math or logic challenges.
The Scenario
You are faced with a high-stakes coding bug or a complex mathematical proof where a standard AI might hallucinate or skip steps.
Before & after
Solving complex logic puzzles or debugging intricate multi-file code manually usually requires deep focus and trial-and-error over 60–90 minutes.
Use the `deepseek-reasoner` endpoint to trigger the "thinking" mode for the same query. The AI will output its internal chain of thought, reaching a solution in 1–2 minutes.
The Prompt
[SYSTEM: You are using the deepseek-reasoner model] I have a complex logical problem that requires step-by-step verification: [DESCRIBE_COMPLEX_PROBLEM_OR_CODE_ERROR]. Please show your 'thinking' process and provide the final solution.
DeepSeek-V3.2 identifies two distinct modes. While 'deepseek-chat' is for standard tasks, 'deepseek-reasoner' is specifically architected for tasks requiring high-level reasoning, such as math benchmarks and complex coding competitions.
Source
Change Log | DeepSeek API Docs"deepseek-reasoner corresponds to DeepSeek-V3.2's thinking mode"