7 min read
AI Reasoning Models in 2026: What o3, R1, and Deep Thinking Actually Mean for Founders
Reasoning models (o3, DeepSeek R1, Claude 3.7 Sonnet extended thinking) are fundamentally different from standard LLMs. They think before they answer — and that changes everything about how you use them, when you use them, and how much they cost. A founder's guide.