reasoning-models

GPT-5 explained: OpenAI's unified model with auto-routing, three sizes, benchmarks vs Claude 4, Gemini 2.5 and Grok 4, pricing, and what changed.

DeepSeek R1 is an open-weights reasoning model released January 2025 that matched OpenAI o1 and triggered a $589B Nvidia stock drop.

Gemini 2.5 Pro is Google DeepMind's reasoning model with a 1M-token context and top scores on coding and reasoning benchmarks at launch.