
GPT-5.5 Drops + Anthropic's Mythos Gets Breached | AI News in 5
28/04/2026
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4:52
The AI model that was too dangerous to release just got breached. Anthropic entered the design software market. And OpenAI dropped its biggest model yet, just six weeks after the last one.
This week, the NSA is using Anthropic's Mythos despite the Pentagon blacklisting the company, Claude Design takes on Figma and sends its stock down 7%, Yelp transforms into an agentic consumer app, Mythos gets accessed by an unauthorized Discord group, and OpenAI fires back with GPT-5.5.
If you are a founder, operator, or executive trying to keep up with AI, this is your weekly five-minute briefing every Tuesday.
Stories Covered This Week:
NSA uses Anthropic's Mythos Preview despite the Pentagon declaring the company a supply chain risk
Anthropic launches Claude Design, a prompt-to-prototype design tool that sent Figma stock down 7%
Yelp's upgraded AI assistant can now book restaurants, doctors, and more in one conversation
Anthropic investigates unauthorized access to Mythos through a third-party vendor environment
OpenAI releases GPT-5.5, scoring 88.7% on SWE-bench with a 60% drop in hallucinations vs GPT-5.4
Episode Timestamps:
00:00 Intro
00:20 NSA uses Anthropic's Mythos despite Pentagon blacklist
01:10 Anthropic launches Claude Design
02:00 Yelp's AI assistant goes full service
02:50 Anthropic investigates Mythos breach
03:40 OpenAI drops GPT-5.5
04:30 Outro
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