The MAD Podcast with Matt Turck Anthropic’s Felix Rieseberg: Claude Cowork, Mythos, and the SaaS Extinction
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Apr 10, 2026 
Felix Rieseberg, an engineering leader at Anthropic who built platforms at Slack, Stripe, and Notion, discusses Claude Mythos and Claude Cowork. He explains why Mythos is a step-function change and how Cowork uses VMs, text-file skills and memory, and local computer access. He also covers UX, rapid prototyping, taste as a bottleneck, and why building trust with agents matters.
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Build Trust By Starting Small And Scaling Tasks
- Start users with tiny, trustworthy tasks and expand scope as they gain confidence to build trust.
- Felix describes launching features like desktop cleanup and scheduled tasks so users see reliable outputs before offloading larger work.
UX Can Outweigh Raw Model Power
- UX often matters as much as model power; the same model in a better interface (Cloud Code vs terminal) can produce outsized impact.
- Felix compares product differentiation to phones: remove friction rather than piling on features.
Exploit Cheap Execution With Rapid Prototyping
- Iterate fast and prototype broadly now that execution is cheap; build many internal prototypes to find what resonates.
- Felix says Anthropic runs ~100 prototypes and ships with a one-month roadmap to course-correct quickly.
