#216 - Grok 4, Project Rainier, Kimi K2

Our 216th episode with a summary and discussion of last week's big AI news! Recorded on 07/11/2025

Hosted by Andrey Kurenkov and Jeremie Harris. Feel free to email us your questions and feedback at contact@lastweekinai.com and/or hello@gladstone.ai

Read out our text newsletter and comment on the podcast at https://lastweekin.ai/.

In this episode:

• xAI launches Grok 4 with breakthrough performance across benchmarks, becoming the first true frontier model outside established labs, alongside a $300/month subscription tier

• Grok's alignment challenges emerge with antisemitic responses, highlighting the difficulty of steering models toward "truth-seeking" without harmful biases

• Perplexity and OpenAI launch AI-powered browsers to compete with Google Chrome, signaling a major shift in how users interact with AI systems

• Meta study reveals AI tools actually slow down experienced developers by 20% on complex tasks, contradicting expectations and anecdotal reports of productivity gains

Timestamps + Links:

• (00:00:10) Intro / Banter

• (00:01:02) News Preview

Tools & Apps

• (00:01:59) Elon Musk's xAI launches Grok 4 alongside a $300 monthly subscription | TechCrunch • (00:15:28) Elon Musk’s AI chatbot is suddenly posting antisemitic tropes • (00:29:52) Perplexity launches Comet, an AI-powered web browser | TechCrunch • (00:32:54) OpenAI is reportedly releasing an AI browser in the coming weeks | TechCrunch • (00:33:27) Replit Launches New Feature for its Agent, CEO Calls it ‘Deep Research for Coding’ • (00:34:40) Cursor launches a web app to manage AI coding agents • (00:36:07) Cursor apologizes for unclear pricing changes that upset users | TechCrunch

Applications & Business

• (00:39:10) Lovable on track to raise $150M at $2B valuation • (00:41:11) Amazon built a massive AI supercluster for Anthropic called Project Rainier – here's what we know so far • (00:46:35) Elon Musk confirms xAI is buying an overseas power plant and shipping the whole thing to the U.S. to power its new data center — 1 million AI GPUs and up to 2 Gigawatts of power under one roof, equivalent to powering 1.9 million homes • (00:48:16) Microsoft's own AI chip delayed six months in major setback — in-house chip now reportedly expected in 2026, but won't hold a candle to Nvidia Blackwell • (00:49:54) Ilya Sutskever becomes CEO of Safe Superintelligence after Meta poached Daniel Gross • (00:52:46) OpenAI’s Stock Compensation Reflect Steep Costs of Talent Wars

Projects & Open Source

• (00:58:04) Hugging Face Releases SmolLM3: A 3B Long-Context, Multilingual Reasoning Model - MarkTechPost • (00:58:33) Kimi K2: Open Agentic Intelligence • (00:58:59) Kyutai Releases 2B Parameter Streaming Text-to-Speech TTS with 220ms Latency and 2.5M Hours of Training

Research & Advancements

• (01:02:14) Does Math Reasoning Improve General LLM Capabilities? Understanding Transferability of LLM Reasoning • (01:07:58) Measuring the Impact of Early-2025 AI on Experienced Open-Source Developer Productivity • (01:13:03) Mitigating Goal Misgeneralization with Minimax Regret • (01:17:01) Correlated Errors in Large Language Models • (01:20:31) What skills does SWE-bench Verified evaluate?

Policy & Safety

• (01:22:53) Evaluating Frontier Models for Stealth and Situational Awareness • (01:25:49) When Chain of Thought is Necessary, Language Models Struggle to Evade Monitors • (01:30:09) Why Do Some Language Models Fake Alignment While Others Don't? • (01:34:35) Positive review only': Researchers hide AI prompts in papers • (01:35:40) Google faces EU antitrust complaint over AI Overviews • (01:36:41) The transfer of user data by DeepSeek to China is unlawful': Germany calls for Google and Apple to remove the AI app from their stores • (01:37:30) Virology Capabilities Test (VCT): A Multimodal Virology Q&A Benchmark