R1

DeepSeek R1 is an open-weight reasoning model that performs step-by-step chain-of-thought inference to work through complex problems before generating answers.

Strengths

The model excels at breaking down complex reasoning tasks into explicit, interpretable steps, making it effective for problems that benefit from deliberate intermediate reasoning.

Best for

Tasks requiring transparent multi-step reasoning, such as math, logic, code generation, and complex analysis where intermediate thinking is valuable.

Limitations

The step-by-step reasoning process adds latency compared to direct-answer models, and the model has been superseded by newer reasoning approaches—most recent queries now route to V4 Flash thinking mode.