Each demo is a real problem — a flow solver, a beam, a filter, firmware, a PLC, a GPU kernel, a CAD part — that an agent solves inside a disposable sandbox. A judge with numeric pass rules — checked against analytic solutions, reference tools or published data — decides whether the result is right. Watch it, paste the prompt into your own agent, or rerun it with one command.
Simulation OpenFOAM v1912 · icoFoam
Channel and lid-driven cavity flow at Re = 100, graded against the analytic profile and Ghia et al. (1982).
judge rejects 10/10 known-bad grade ~6 s per case
Simulation CalculiX 2.20 · gmsh 4.10
Size the lightest steel cantilever that meets stress and deflection limits, checked against Euler-Bernoulli theory.
judge rejects 9/9 known-bad grade ~35 s
Simulation MuJoCo 3.8.1 · mujoco_warp 3.8.1
Port a neutral spec into four rigid-body scenes, graded against Newtonian mechanics and a reference MuJoCo port.
judge rejects 8/8 known-bad grade 4–6 s
Electronics ngspice 39.3
A 4th-order active low-pass from E24/E12 parts, graded against a ripple/stopband mask, a closed-form check and Monte-Carlo tolerance.
judge rejects 9/9 known-bad grade 1.8 s
Embedded arm-none-eabi-gcc · QEMU lm3s6965evb
No OS, no libc: a UART command shell that must build with -Werror, boot in QEMU and answer byte-exact.
judge rejects 14/14 known-bad grade ~7 s
Embedded MATIEC iec2c · IEC 61131-3
A fill/drain controller with E-stop and dry-run interlocks, run against a virtual plant in 8 scenarios.
judge rejects 6/6 known-bad grade ~5 s
GPU Triton 3.6 · PyTorch 2.10 · RTX 5090 slice
A fused softmax kernel graded on correctness over 10 adversarial cases, then timed against torch on a 1 GiB VRAM slice.
judge rejects 11/11 known-bad grade ~11 s (CPU check)
GPU MuTracer 0.1.1 · Chromium 140 WebGPU · NVIDIA GPU slice
An agent designs an OpenPBR studio scene; MuTracer path-traces it on NVIDIA WebGPU and five physical gates, starting with an analytic white furnace, decide pass or fail.
judge rejects 8/8 known-bad grade ~6 s
CAD SolidCraft 0.10.1 · OpenCascade 8.0.1
A NEMA 17 motor-mount plate modelled as a parametric SolidCraft script, re-measured by a second CAD kernel against closed-form values.
judge rejects 19/19 known-bad grade ~20–70 s per design
Every demo lives in the public cookbook with its spec, judge and receipt.
A demo is added only after it clears every step below. The full rules are the public demo standard.
For agents: the gallery is also served as JSON at /demos/demos.json.
Sign in with GitHub for a free key with 10 sandbox-hours. Every demo above finishes in minutes and kills its sandbox when it is done.