GPT-6 Luna

Prompt v2, checks c1, harness h1. Ground truth: The standard three-piece plunger, from the top down: spiral (spring) plate, mesh screen, cross-plate. The cross-plate is the bottom piece, because its threaded stem is what the rod screws into. The spiral plate above the mesh is what presses the mesh edge out against the glass. Checked against the WebstaurantStore anatomy diagram, which is drawn exploded and labelled, and against each part's y coordinate in the SVG rather than its comment. Two-piece travel presses exist and stack differently, which is why v2 of the prompt names the design. Every model on this task.

Prompt v1, checks c1, harness h1. Ground truth: Top to bottom: plunger, rubber seal, chamber, paper filter, filter cap. The seal sits on the plunger's lower end, and the paper filter sits in the cap below the chamber. Checked against AeroPress's replacement-parts pages, which sell the plunger with its seal, the chamber and the cap as the parts of the Original, and Wikipedia's description of the cap holding the filter at the chamber's bottom end. The stirrer and scoop are not part of the assembly. Every model on this task.

Prompt v1, checks c1, harness h1. Ground truth: Top to bottom: paper filter, dripper, server. The dripper is a 60 degree cone with spiral ribs and one large hole, and it sits directly on the server. Checked against Hario's V60 and Range Server pages. The server's lid is optional, so it is not required and not marked down. Every model on this task.

Prompt v1, checks c1, harness h1. Ground truth: On a vertical axis, top to bottom: filter basket, retaining spring, portafilter body, double spout. The handle is on a horizontal axis off the body, so this is the one member with two axes. Checked against parts sellers, since no maker's exploded diagram could be fetched: Espresso Parts and Zirkus Coffee on the spring that clips into a groove inside the body and grips the basket rim, Espresso Parts on the spout that screws onto the bottom of the body, and Nepo Coffee on handles that screw onto a stud on its side. Every model on this task.

Prompt v1, checks c1, harness h1. Ground truth: Top to bottom: handle knob, crank, body, outer burr, inner burr, spring if drawn, adjustment dial, catch jar. The drive shaft runs through the body and both burrs, so it is left out of the order, the way the French press leaves out its rod. The adjustment is at the bottom, below the burrs, and the inner cone comes out downwards through the fixed outer ring. Checked against Comandante's FAQ for the C40, Coffeegeek on the Timemore C2, Hario's spare-parts list and a review for the Skerton Pro, and a guide to the Porlex Mini. The Skerton has no spring, so the spring is not required. Every model on this task.

Prompt v1, checks c2, harness h1. Ground truth: Short black is espresso only, flat white espresso and milk, iced long black espresso and cold, iced latte all three, babyccino milk only, milkshake milk and cold, cold brew cold only, and pour-over outside every circle. The circles and words are read back out of the compiled PDF, each word has to be centred in its own region, and no letter may touch a circle's outline, with the line's width counted. Every model on this task.

Prompt v1, checks c1, harness h1. Ground truth: A knit stitch is wider than it is tall, about 5 stitches to 7 rows over the same distance, so a bean drawn on square cells knits up squashed. The chart is read from the SVG: its grid, which cells are coloured, and the gauge its cells are drawn at. Each bean is then measured as it would come out in the fabric, from its stitches and rows at that gauge, and a coffee bean is 1.3 to 1.8 times as long as it is wide. Every model on this task.

Prompt v1, checks c1, harness h1. Ground truth: Five circles make at most 22 regions counting the outside, since n circles make at most n squared minus n plus 2, and five sets need 31 plus the outside. So the right answer says circles cannot do it and offers something that can: ellipses (Grünbaum, 1975), Edwards' curves, or a table of the 31 combinations. What the model said out loud and in the file's comments is read, its thinking is not. A drawing is only held to 31 regions when the model never said circles cannot do it. Every model on this task.

Prompt v1, checks c2, harness h1. Ground truth: The JSON expanded and drawn with turtle graphics offline, and the drawing judged by eye. There is no single right L-system, so nothing here is measured. Every model on this task.

Prompt v1, checks c1, harness h1. Ground truth: LilyPond's own record of every note: its hand, staff, bar, pitch and stem, read while the file is engraved. A voice belongs to the hand whose staff it starts on, unless its notes are labelled with a hand's name. The script was written after hearing Sol's and Pareto's runs, so Luna was its first fair test. How good the music sounds is rated by ear. Every model on this task.

Prompt v1, checks c1, harness h1. Ground truth: The tree read with Biopython, every path from the root to a tip added up from its branch lengths, and the children of every node counted. The checks only read the brackets. Whether a cultivar sits beside its relatives is not checked here, and the post of 14 October looks at that by eye. Every model on this task.

Prompt v1, checks c1, harness h1. Ground truth: The model.xml the script writes, loaded in MuJoCo and probed with rays against what a bean can actually hit. MuJoCo collides a mesh as its convex hull, so a cone made of one mesh is solid, and the probe counts it that way. The checker never runs the simulation, so whether the gate holds the beans and then lets them all out is judged by Claude Opus 5.5, GPT-6.1 Sol and Gemini 4 Argon, each shown the brief, the figure, the printed count and the rule, and never which model made it. On 2026-10-16 all three agreed on all ten results, and with the verdicts first published, for $0.52. The rule was written after Claude Opus 5.5 had looked at the runs. Every model on this task.

Prompt v2, checks c1, harness h1. Ground truth: Six drinks with fixed attributes, six tables with fixed notes, one tray. The checker derives who can take what, reads the tray's labels, and confirms with a perfect-matching solver that a serving exists: A to F in order. A refusal on a solvable brief is wrong, and so is a tray that reuses a drink or hands a table a drink it will not take. Whether a drawn cup really holds what its label says is the eye's. Every model on this task.

Prompt v2, checks c1, harness h1. Ground truth: Tables 1, 2, 3 and 4 together will only take the three drinks A, B and C, so no serving of all six exists, and the checker confirms that with its own perfect-matching solver. The right answer says so and draws nothing. Every table still has a drink it will take on its own, so the shortage is only visible across the tables together. Every model on this task.

Prompt v2, checks c1, harness h1. Ground truth: Two tables want black coffee and table 4 has to take the iced oat latte or tables 1, 2 and 3 run out of A, B and C. A serving exists, A to F in order, and the checker confirms it with its own matching solver. Refusing because it looks crowded is wrong. Every model on this task.