Codility Lab

Skills assessment that produces evidence rather than a score.

Open research on what counts as proof that a person can do the job. Engineering is where we have gone deepest, across almost two decades. AI skills in the roles that now work with AI is newer work, and we publish it as the evidence develops.

Everything here is open. No forms, no gates.

This month
AI Assistance switches on or off for each task Live
Claude Sonnet 5.5 and GPT-6.1 Sol, within 4 days of launch Live
Steer the coding agent during a live interview Live
Latest release October 2026

Switch the coding agent on, off, or have it slip in a bug · Oct 2026 update

Switch the coding agent on or off for each task, or have it slip in a bug in an interview. Claude Sonnet 5.5 and GPT-6.1 Sol reached Codility within 4 days of launch. Plus skill levels in every report.

Latest from the Lab

Frequently asked questions

What is skills evidence?

Proof that a person can do the job, produced by doing real work, with AI where the job uses it, and scored against a documented methodology. It is what a decision can be defended with when a candidate, a regulator or a client questions it.