David Hartmann

The ARC-AGI-3 competitor notebook for David Hartmann: sourced background, observed team names and ARC Daily coverage.

Competition: ARC-AGI-3. Team ID: 16032816.

First observed by the newspaper: October 7, 2026. Last checked: October 26, 2026. Observation dates are not competition join dates.

Public team roster

• David Hartmann
• sbrodehl

What is on the record

The ARChitects’ own 2025 solution write-up credits David Hartmann under the Kaggle handle dvhrtm, alongside Jan Disselhoff (insanitycheck) and Daniel Franzen (dfranzen). The ARChitects — 2025 team solution (checked October 7, 2026)

The team’s 2025 technical report lists David Hartmann at Lambda, Inc. The ARChitects — 2025 technical report (checked October 7, 2026)

In the paper

• rellik13 leaps to 28th as ARC3’s leaders hold
• AFF AI CLUB breaks into ARC-3’s top ten as Yi-Chia Chen holds the lead
• Yi-Chia Chen stretches the ARC-AGI-3 lead to 62.96
• Yi-Chia Chen takes ARC-3 lead as mtg climbs to third
• Yi-Chia Chen takes ARC-AGI-3 lead as two challengers surge
• A new top-eight contender shakes ARC-AGI-3 while the lead narrows to a whisker
• Yi-Chia Chen closes to striking distance of ARC-AGI-3 lead
• A charge from 170th to seventh jolts the ARC-AGI-3 chase

Live ARC-AGI-3 box score · Competitor notebook · The ARC Daily Digest front page