Tidel.ai
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Notes from
the data floor.

How we think about coding agents, benchmarks, data quality and evaluation — written by the team that builds and verifies the tasks.

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Pass rates belong on the datasheet

Why we run frontier-model rollouts on every coding task we sell — and what "hard" should actually mean.

What long-horizon really demands of a task

Anatomy of repository-engineering work that still resists frontier agents after hundreds of steps.

Long-horizon is not just more turns

Evolving requirements, milestone chains, and why multi-turn data needs structure — not just length.

Contamination is a supply-chain problem

Screening against public benchmarks is table stakes; the real fix is sourcing material that was never public at all.

Write with us.

We publish guest posts from researchers working on coding agents, evaluation, robotics and world models.