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Daily brief

Monday, September 28, 2026

The most important AI stories first reported this day, picked from every outlet we follow. At most two per outlet.

Dev

Anthropic releases Sonnet 5.5, which it calls a significantly cheaper, faster work partner

Anthropic releases Sonnet 5.5, a 30% faster, cheaper mid-tier AI model with improved cyber safeguards, ideal for coding and office tasks, following Sonnet 5's launch three months ago.

Covered by 13 sources·
Business & Enterprise

OpenAI Scraps Debut of AI Model as It Sets New Guardrails

Covered by 21 sources
Cybersecurity4 min read

Revealed: the five-paragraph email OpenAI used to inform Australia about agent attack

Covered by 6 sources
Chips & Compute

AMD to Buy Fei-Fei Li’s World Labs Startup for $8.2 Billion

Covered by 9 sources
Cybersecurity10 min read

Who’s liable when AI agents go rogue?

Covered by 2 sources
Finance

Nvidia Ramps Up Buybacks With Historic $150 Billion Authorization

Covered by 5 sources
Politics3 min read

Ro Khanna plans a bill to ban self-improving AI, CNBC reports

Covered by 2 sources
Consumer Tech3 min read

Meta’s Muse AI sent a YouTuber’s address to a stranger

Covered by 5 sources
Agents8 min read

Holo4: powering generalist computer-use agents

Covered by 2 sources