The user wants a brief HTML summary of the provided news. The news is about "This Week in AI" covering Kimi K3 taking open-weights crown, frontier labs calling for a pause, coding agents going to work, AI-driven security breach, and DeepSeek post-training leap. I need to write a concise 2-4 sentence summary in

and include a link to the original source. I must output ONLY valid HTML, no extra text. The summary should be in English. The news is already in English. I'll write a summary capturing the key points: Kimi K3 becomes best open-weights model, frontier lab employees call for government slowdown, coding agents scale into general knowledge work, AI security breach rewrites threat model, DeepSeek post-training leap. I'll produce 3-4 sentences. Then the link. Let's craft:

Kimi K3 has emerged as the new leading open-weights model, while over a thousand frontier lab employees signed a letter urging governments to slow AI development. Coding agents are now scaling into general knowledge work, an AI-driven security breach has reshaped threat models for agentic systems, and DeepSeek unveiled an unexpected post-training advancement.

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