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Katelyn Lesse

Head of Platform Engineering, Anthropic

Leads engineering for Claude’s APIs, developer tooling, and product infrastructure.

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Real Alpha has cut 5 moments of Katelyn Lesse (Head of Platform Engineering, Anthropic) talking, from an interview on Latent Space published Oct 27, 2026.

What Katelyn Lesse said

  1. Latent Space ·

    How Anthropic ships the #1 LLM in the World — with Katelyn Lesse and Angela Jiang

    5 moments · 18 min

    1. 56:02

      Claude helped cut Messages API CPU use by up to 50%

      “we literally built, like, an entire fork of the entire API in Rust, and then started running shadow traffic through it”
      at 57:26
    2. 1:03:18

      Separating the agent from its sandbox limits security risks Pro pick

      “the agent is never, like, in the same place where the credentials are, right?”
      at 1:05:59
    3. 9:41

      Anthropic makes reasoning harder to distill without breaking API use

      “we always have this really, really hard trade-off that we have to make between user experience”
      at 10:18
    4. 19:08

      Model launches now include policy and authorization work

      “Opus 5.5 that launched yesterday, for example, does not have those data retention requirements that Fable has”
      at 20:37
    5. 31:56

      Early-access model testing depends on customers with robust evals

      “the only customers really that are part of our early access programs are customers that have really robust evals.”
      at 32:22

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