#241 - Opus 4.7, Muse Spark, GPT-5.4-Cyber, HY-World 2.0

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)