#241 - Opus 4.7, Muse Spark, GPT-5.4-Cyber, HY-World 2.0
Last Week in AI
Apr 23
#241 - Opus 4.7, Muse Spark, GPT-5.4-Cyber, HY-World 2.0
#241 - Opus 4.7, Muse Spark, GPT-5.4-Cyber, HY-World 2.0
Last Week in AI
Apr 23
Unprocessed episode, you can be the first!
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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