Lenny's Newsletter · Lenny Rachitsky
podcastplaybookAnthropic’s first technical PM on token maxing, the jagged edge, and living in the future | Dianne Penn
26 July 2026Product
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About Lenny's NewsletterListen now | Dianne Penn, Anthropic’s first PM, on the bets that made Claude dominant: the coding pivot, the eval-driven development loop, and what comes after coding is solved
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Apollo layer
What a founder can learn
Founder takeaway
When a technology has uneven capabilities, don’t pursue every possible use case. Use rigorous evaluations to find where performance is already strong enough to create meaningful customer value, then concentrate product development there.
Why it matters
Emerging technologies often have a jagged edge: impressive in some tasks and unreliable in others. An evaluation-driven loop helps founders replace broad optimism with evidence, choose a focused market wedge, and improve the product against outcomes customers actually value.
Put it to work
For your three highest-priority use cases, what recurring evaluation would reveal whether the product reliably solves the customer’s job—and which use case would earn more investment based on the results?