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Anthropic launched Claude Opus 5.5 and updated the Claude Platform to support safer agent execution via sandboxing and separated model “brain” and agent “hands”

Model release Provisional 74% confidence first seen

Anthropic described how it deploys Claude using a “brain”/“hands” separation approach that isolates untrusted code with sandboxing while protecting credentials and controlling execution. The coverage also notes the launch of Claude Opus 5.5 alongside platform-level API changes, including a Rust rebuild of the Messages API, aimed at safer production agent use and improved evaluation.

Anthropic Claude Claude Opus 5.5 Claude Platform Claude Platform Opus 5.5 Angela Jiang Katelyn Lesse Latent Space Messages API

Source coverage

How Anthropic ships the #1 LLM in the World safely: Separating the Brain from the Hands Latent Space newsletter How Anthropic ships Claude with Claude: Separating the Brain from the Hands Latent Space newsletter

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