Reasoning Models(Reasoning Models)

Reasoning models are LLMs designed to allocate additional test-time compute to step-by-step problem solving before producing a final answer. Pioneered by OpenAI o1 and DeepSeek-R1, the paradigm expanded in 2026 to include GPT-5.5 Thinking, Gemini 3 Deep Think, and evolutionary approaches like AlphaEvolve.

The core trade-off is reasoning depth vs. latency: deeper thinking yields better accuracy on hard benchmarks (AIME, GPQA Diamond, ARC-AGI-2) at the cost of higher inference time.

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