Definition
Plain language
The protein shell that wraps up a virus's genetic material.
As stated in the literature
The self-assembling protein coat enclosing a viral genome; capsid packaging design tasks appear in biosecurity capability evaluations as a proxy for uplift in engineered-pathogen work.
Also called: capsid, viral-capsid packaging
Why it matters: Design tasks involving capsids show up in biosecurity testing because getting genetic material packaged and delivered is a key step in building a working pathogen.
For example, the outer protein shell of a cold virus is what lets it survive outside a cell and deliver its genes once it gets inside one.
Heard on the show
“… evaluations OpenAI uses to probe its Critical bio threshold — tasks involving things like viral-capsid packaging or protein function — Astra is flat, or slightly worse than the previous model. …”Episode 259 — GPT-6 Astra Behaves Better, And OpenAI Can Read It Less