Merantix AI Campus · Berlin · 2026
Four months.
Nine threads.
One residency.
Tebjan Halm & Geoffrey Kasenbacher
We didn't have
one big thing.
We had nine.
by the numbers
how it unfolded
Six codebases running in parallel
May
routing-snn, hackathon
01 · Tebjan
Aither
The idea machine.
23 → 9
ideas cataloged → real projects shipped
02 · Tebjan + Geoffrey
routing-snn
Beating dense — for less.
238.53 vs 241.98 perplexity
25% less compute
routing-snn
The longest-running thread.
662 commits
14 branches
still committing today
Geoffrey's kernel + design doc → Tebjan's training loop, since May.
03 · Tebjan + Geoffrey, together
AI4Science
Hackathon
Built together. Under a clock.
~4 hours2 independent buildsautonomous science agent
04 · Tebjan + Geoffrey
gt-notes
The knowledge hub. Three real tools live here.
gt-notes → tool 1
Paper Reader
→ becoming a general-intelligence layer
for desktop & web.
9 versions in 10 dayssubscription chat + PDF + mind-map canvas
gt-notes → tool 2
The Knowledge Base
Verifies its own quotes.
44/44
tests green — ingest to synthesis, end to end
gt-notes → tool 3
The Podcast Pipeline
Audio in. Dubbed podcast out.
WhisperX + pyannotevoice-cloned re-dub~2× realtime
05 · Tebjan, solo
Werft
A product factory. Built in 3 days.
428
tests green · 2 shipped products
06 · Tebjan + Geoffrey
Attensor
Real-time video. Pushed to 8K.
8192×4096
tiled video diffusion — on one 16GB GPU
Attensor
Geoffrey's feature.
Tebjan's engine.
A real-time diffusion engine running since 2023 — this became the tech behind Halbach.
07 · Tebjan
GBC
280 years unsolved. We mapped the walls.
9 proof doors closed6 still opennot a proof — an honest map
08 · Tebjan
musk
A DJ that makes its own music.
16.9ms
per frame — real-time, 2.4× headroom
09 · where it's heading
Halbach
The company.
Halbach
Formerly Attensor. Founded on this work.
40× claimed speedupreal customers: Refik Anadol & others
SPRIND ask: €1.35MAI NATION deadline: Aug 9
Tebjan won "AI Builder Day" at Merantix — May 31, 2026.
still building
1.5 months left.
This is the midpoint, not the finale.