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Public benchmarks get gamed. Private evaluations tell the truth but cannot be checked. Where is the balance? Third-party evaluators Organizations like METR (formerly ARC Evals) and the UK AI Safety Institute run closed evaluations on frontier models.
Public benchmarks are verifiable — anyone can reproduce the score. Private benchmarks are trustworthy — they cannot be gamed or leaked. Every evaluation regime must trade these two goods off.
| Eval type | Transparency | Trustworthiness |
|---|---|---|
| Fully public (MMLU, HumanEval) | High | Degrades with time |
| Held-out test (kept private by authors) | Medium | High at launch, degrades as items leak |
| Blind third-party (METR, UK AISI) | Low | Very high |
| Live human eval (Arena) | Medium | High; cannot memorize what is unknown |
Organizations like METR (formerly ARC Evals) and the UK AI Safety Institute run closed evaluations on frontier models. They are trusted precisely because their prompts are not public. But you, the outsider, must take their reports on faith.
Public evaluations do not tell us about frontier capabilities. Private evaluations do, but nobody can check them.
— A policy researcher at a frontier AI lab
The big idea: the healthiest evaluation ecosystem mixes public (verifiable), private (trustworthy), and your own (relevant) measurements.
15 questions · take it digitally for instant feedback at tendril.neural-forge.io/learn/quiz/end-creators-private-vs-public-evals
What is the core idea behind "Private vs. Public Evaluations"?
Which term best describes a foundational idea in "Private vs. Public Evaluations"?
A learner studying Private vs. Public Evaluations would need to understand which concept?
Which of these is directly relevant to Private vs. Public Evaluations?
Which of the following is a key point about Private vs. Public Evaluations?
Which of these does NOT belong in a discussion of Private vs. Public Evaluations?
Which statement is accurate regarding Private vs. Public Evaluations?
Which of these does NOT belong in a discussion of Private vs. Public Evaluations?
What is the key insight about "Your private eval" in the context of Private vs. Public Evaluations?
What is the key insight about "Small evals can still be useful" in the context of Private vs. Public Evaluations?
What is the recommended tip about "Ground your practice in fundamentals" in the context of Private vs. Public Evaluations?
Which statement accurately describes an aspect of Private vs. Public Evaluations?
What does working with Private vs. Public Evaluations typically involve?
Which of the following is true about Private vs. Public Evaluations?
Which best describes the scope of "Private vs. Public Evaluations"?