AI Models of the Week (Dec 1–7, 2025): OpenAI’s GPT‑5.2 ‘Code Red’, xAI’s Grok 4.20, and Google DeepMind’s Gemini 3 Deep Think
The first week of December 2025 has felt like an AI season finale. OpenAI is in an official “code red,” racing to ship a new GPT‑5.2 reasoning model. Elon Musk’s xAI is boasting that its Grok 4.20 bot just beat every other frontier model in a real‑money trading league. And Google DeepMind is rolling out Gemini 3 Deep Think while scrambling to fix bias problems in its Nano Banana Pro image model. Here’s a detailed rundown of what actually happened between 1–7 December 2025, and what it signals about the current AI model race. 1. OpenAI: From “Code Red” to