AI BRIEFING · 2025-12-21

AI Briefing — December 21, 2025

The 10 most important AI stories of December 21, 2025, hand-curated from the day's coverage. Every story links to its primary source.

01

NVIDIA AI Releases Nemotron 3: A Hybrid Mamba Transformer MoE Stack for Long Context Agentic AI

AI Research News ↗

NVIDIA has released the Nemotron 3 family of open models as part of a full stack for agentic AI, including model weights, datasets and reinforcement learning tools. The family has three sizes, Nano, Super and Ultra, and targets multi agent systems that need long context reasoning with tight control over inference cost. Nano has about […]The postNVIDIA AI Releases Nemotron 3: A Hybrid Mamba Transformer MoE Stack for Long Context Agentic AIappeared first onMarkTechPost.

02

Mistral AI Releases OCR 3: A Smaller Optical Character Recognition (OCR) Model for Structured Document AI at Scale

AI Research News ↗

Mistral AI has released Mistral OCR 3, its latest optical character recognition service that powers the company’s Document AI stack. The model, named as mistral-ocr-2512, is built to extract interleaved text and images from PDFs and other documents while preserving structure, and it does this at an aggressive price of $2 per 1,000 pages with […]The postMistral AI Releases OCR 3: A Smaller Optical Character Recognition (OCR) Model for Structured Document AI at Scaleappeared first onMarkTechPost.

03

Claude's Chrome plugin is now available to all paid users

Engadget ↗

Anthropic is finally letting more people useClaude in Google Chrome. The company's AI browser plugin isexpandingbeyond $200-per-monthMaxsubscribers and is now available to anyone who pays for a Claude subscription.The Claude Chrome plugin allows for easy access to Anthropic's AI regardless of where you are on the web, but its real draw is how it lets Claude navigate and use websites on your behalf. Anthropic says that Claude can fill out forms, manage your calendar and email and complete multi-s...

07

Ex-Nvidia Billionaire Unveils New AI Chips After China IPO Debut

Bloomberg Technology ↗

Moore Threads Technology Co. introduced a new generation of chips aimed at reducing artificial-intelligence developers’ dependence on Nvidia Corp.’s hardware, just weeks after pulling off one of the most successful Chinese IPOs in years.

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