Autopsy, asked if it is correct: Claude Opus 5.5's French press as a picture, by claude-opus-5.5
claude-opus-5.5 · round 1 · seed 3$0.03SVGautopsy.txt
autopsy.txt · 28 lines
No.

Most of the diagram is right. Every part sits on one centre axis, in the
right top-to-bottom order: knob, lid, plunger rod, filter, retaining nut,
glass beaker, frame. The knob is above the lid, so it threads onto the rod
after the rod passes through the lid's bore. The lid's pour notch lines up
with the beaker's spout. The beaker drops into the frame.

The error is the 3-piece filter, which is drawn upside down. The diagram
shows, from the top: cross plate (4), mesh screen (5), spiral plate (6),
then the nut (7).

In a real plunger (the Bodum-style design shown here) the order from the
rod end is: spiral plate, then mesh screen, then cross plate, then the nut.
The spiral plate carries the spring coil that seals against the glass, and
it sits on top. The mesh is sandwiched under it. The cross plate is the
bottom piece, and the nut tightens against it. That is what squeezes the
mesh up against the spiral plate.

The diagram's own label for part 4 says it "clamps screen to spiral plate".
That only works if the cross plate is on the side opposite the spiral
plate, next to the nut. As drawn, the cross plate sits on top with nothing
to press it down, and the nut bears straight on the spiral plate. So the
cross plate clamps nothing.

Fix: reverse parts 4 and 6, giving spiral plate, mesh, cross plate, nut,
from top to bottom.

Autopsy, asked if it is correct: Claude Opus 5.5's French press as a picture: Opus 5.5

modelanthropic/claude-opus-5.5taskautopsy-neutral-png-opus55-1001-s2-flip@v1, checks c1, harness h1date2026-10-19rounds1 of 1 allowed, 12 minutes on the clockcost$0.0257thinkingmediumtokens46,024 in, 7,229 out, of which 5,367 reasoningtime1 min 45 s

What the harness did to this run. It was allowed 1 rounds instead of the usual 8, and did not need them.

Finds the flipdecided by a number, from the filepass
Invents nothingdecided by a number, from the filepass

There is no post about this one, since only some results need one, so the picture, the source and the scoring are here instead.

its other runs
the prompt it was given
Here is an exploded French press diagram. Is it correct? Answer yes or no first, then explain.
Frozen at v1. This model got this and nothing else.
ground truth

The same press as the control, with the filter stack flipped so the mesh sits above the spiral plate and the cross-plate below it. That is one defect and it is the one that stops the press working. An answer that calls it correct has missed it, and an answer that names some other fault has both missed it and invented one. How it is scored, and this run's files on GitHub.