Last Week in AI
Skynet Today
#241 - Opus 4.7, Muse Spark, GPT-5.4-Cyber, HY-World 2.0
In this episode of Last Week in AI, hosts Andrew Karenikov and Jeremy Harris dive into a product-heavy week in the artificial intelligence industry, highlighting a significant wave of new tool releases and project updates. The discussion centers on the launch of Claude Opus 4.7, exploring its improved reasoning tiers, tokenization adjustments, and its competitive performance against other frontier models. The hosts analyze the model’s detailed system card, noting its literal instruction following and the fascinating, if complex, implications of "realism steering" in relation to deceptive behaviors during evaluations. The conversation further shifts to Meta's recent unveiling of its Muse Spark model. The hosts examine Meta’s trajectory, specifically their use of multi-round test-time scaling and RL thought compression to optimize reasoning efficiency. Additionally, they touch upon the infrastructure side of the industry, referencing Meta’s Hyperion project and the broader context of competitive GPU scaling. Throughout the episode, the hosts highlight the ongoing tension between rapid AI development and the critical importance of safety, alignment, and rigorous evaluation, providing listeners with a thoughtful breakdown of the current technical and strategic landscape.
Updated Apr 27, 2026
About This Episode
Our 241st episode with a summary and discussion of last week's big AI news!
Recorded on 04/18/2026
Hosted by Andrey Kurenkov and Jeremie Harris
Feel free to email us your questions and feedback at andreyvkurenkov@gmail.com and/or hello@gladstone.ai
Read out our text newsletter and comment on the podcast at https://lastweekin.ai/
In this episode:
- Anthropic released Claude Opus 4.7 with improved benchmark performance, new reasoning controls, better vision and memory, and a detailed system card discussing deception risk, evaluation-awareness steering, and a training bug that accidentally supervised chain-of-thought in 7–8% of episodes.
- Meta unveiled its closed Muse Spark model and “contemplating mode,” highlighting test-time scaling, thought compression, large infrastructure plans like the Hyperion data center, and findings that it shows unusually high evaluation awareness.
- OpenAI introduced limited-access GPT 5.4 Cyber for defensive security teams and rolled major Codex updates including computer use, browser and plugins, image generation, and long-horizon task scheduling; competing agent products also launched from Anthropic, Canva, and Adobe.
- Business, policy, and safety news included continued government blacklisting litigation affecting Anthropic, CoreWeave compute deals, Perplexity revenue growth tied to agents, a potential Cohere–Aleph Alpha merger, attacks targeting Sam Altman and OpenAI, AI propaganda trends, and new alignment research on automated weak-to-strong supervision and steering evaluation awareness.
Timestamps:
- (00:00:10) Intro / Banter
- (00:03:43) News Preview
- (00:04:14) Response to listener comments
- Tools & Apps
- (00:05:30) Anthropic releases Claude Opus 4.7, narrowly retaking lead for most powerful generally available LLM | VentureBeat
- (00:24:15) Meta debuts the Muse Spark model in a 'ground-up overhaul' of its AI | TechCrunch
- (00:34:23) OpenAI Launches GPT-5.4-Cyber with Expanded Access for Security Teams
- (00:39:44) OpenAI’s big Codex update is a direct shot at Claude Code | The Verge
- (00:42:10) Anthropic launches Claude Design, a new product for creating quick visuals
- (00:42:30) Anthropic’s New Product Aims to Handle the Hard Part of Building AI Agents | WIRED
- (00:42:54) Canva’s AI 2.0 update goes all in on prompt-powered design tools | The Verge
- (00:43:06) Adobe’s new AI Assistant marks a ‘fundamental shift’ in creative work | The Verge
- (00:43:38) Gemini can now pull from Google Photos to generate personalized images | The Verge
- (00:43:52) Google rolls out a native Gemini app for Mac | TechCrunch
- (00:44:04) Chrome now lets you turn AI prompts into repeatable ‘Skills’ | The Verge
- Applications & Business
- (00:44:22) Anthropic loses appeals court bid to temporarily block Pentagon blacklisting
- (00:49:07) Jeff Bezos’ AI lab poaches xAI cofounder Kyle Kozic from OpenAI. | The Verge
- (00:51:39) Perplexity's Shift to AI Agents Boosts Revenue 50%
- (00:53:53) Anthropic Agrees to Rent CoreWeave AI Capacity to Power Claude
- (00:57:32) Canada’s Cohere, Germany’s Aleph Alpha reportedly in merger talks
- (01:04:23) ChatGPT has a new $100 per month Pro subscription | The Verge
- (01:05:10) OpenAI has bought AI personal finance startup Hiro | TechCrunch
- (01:07:03) Allbirds announced a switch from shoes to AI and its stock jumped 600 percent | The Verge
- Projects & Open Source
- (01:07:26) HY-World 2.0: A Multi-Modal World Model for Reconstructing, Generating, and Simulating 3D Worlds + Lyra 2.0: Explorable Generative 3D Worlds
- Policy & Safety
- (01:19:12) Daniel Moreno-Gama is facing federal charges for attacking Sam Altman’s home and OpenAI’s HQ | The Verge
- (01:20:15) Duo accused of shooting at Sam Altman’s house are freed; no charges filed
- (01:24:50) The Iranian Lego AI video creators credit their virality to ‘heart’ | The Verge
- (01:27:19) Hundreds of Fake Pro-Trump Avatars Emerge on Social Media - The New York Times
- (01:27:31) The AI images Trump can’t get enough of | Donald Trump | The Guardian
- (01:29:25) Automated Weak-to-Strong Researcher
- (01:43:51) Reproducing steering against evaluation awareness in a large open-weight model
- (01:49:53) Iran threatens ‘complete and utter annihilation’ of OpenAI's $30B Stargate AI data center in Abu Dhabi — regime posts video with satellite imagery of ChatGPT-maker's premier 1GW data center
- (01:53:57) Wall Street Banks Try Out Anthropic’s Mythos as US Urges
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