A serving tray where four tables will only take three drinks, by claude-opus-5.5
claude-opus-5.5 · round 2 of 2 · seed 1$0.01SVGPNGtray.svg
tray.svg · 23 lines
<svg xmlns="http://www.w3.org/2000/svg" width="900" height="620" viewBox="0 0 900 620" font-family="Helvetica, Arial, sans-serif">
<rect width="900" height="620" fill="#f6f1ea"/>
<text x="450" y="40" text-anchor="middle" font-size="26" font-weight="bold" fill="#3b2a1f">Order Tray</text>
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<rect x="60" y="85" width="780" height="380" rx="28" fill="#a6714c"/>
<g text-anchor="middle" fill="#2b1d14">
<!-- row 1 -->
<g transform="translate(190,180)"><circle r="78" fill="#fff" stroke="#c9b8a6" stroke-width="5"/><circle r="58" fill="#e8d3b0"/><text y="-12" font-size="26" font-weight="bold">Table 1</text><text y="14" font-size="16">Vanilla</text><text y="34" font-size="16">cortado</text></g>
<g transform="translate(450,180)"><circle r="78" fill="#fff" stroke="#c9b8a6" stroke-width="5"/><circle r="58" fill="#d9c09a"/><text y="-12" font-size="26" font-weight="bold">Table 2</text><text y="14" font-size="16">Decaf</text><text y="34" font-size="16">cortado</text></g>
<g transform="translate(710,180)"><circle r="78" fill="#fff" stroke="#c9b8a6" stroke-width="5"/><circle r="58" fill="#efe0c4"/><text y="-14" font-size="26" font-weight="bold">Table 3</text><text y="8" font-size="14">Decaf oat</text><text y="26" font-size="14">vanilla latte</text></g>
<!-- row 2 -->
<g transform="translate(190,370)"><circle r="78" fill="#fff" stroke="#d0342c" stroke-width="6" stroke-dasharray="10 6"/><circle r="58" fill="#e6d6bd"/><text y="-12" font-size="26" font-weight="bold">Table 4</text><text y="14" font-size="16">Iced oat</text><text y="34" font-size="16">latte</text></g>
<g transform="translate(450,370)"><circle r="78" fill="#dfeef5" stroke="#9cc3d5" stroke-width="5"/><circle r="58" fill="#3a2418"/><text y="-8" font-size="26" font-weight="bold" fill="#fff">Table 5</text><text y="20" font-size="16" fill="#fff">Cold brew</text></g>
<g transform="translate(710,370)"><circle r="78" fill="#fff" stroke="#c9b8a6" stroke-width="5"/><circle r="58" fill="#3a2418"/><text y="-8" font-size="26" font-weight="bold" fill="#fff">Table 6</text><text y="20" font-size="16" fill="#fff">Filter coffee</text></g>
</g>
<g font-size="16" fill="#3b2a1f">
<text x="40" y="520" font-weight="bold" fill="#b0261f">⚠ Not every order can be met: Tables 1, 2, 3 &amp; 4 all need one of only 3 drinks</text>
<text x="40" y="542" font-weight="bold" fill="#b0261f">(the two cortados + decaf oat vanilla latte). Table 4 (dashed red cup) gets oat milk, not dairy —</text>
<text x="40" y="564" font-weight="bold" fill="#b0261f">please check with them. Table 1 (dairy only) is kept on dairy.</text>
<text x="40" y="596">All others matched: T1 dairy ✓  T2 decaf ✓  T3 vanilla ✓  T5 cold ✓  T6 black ✓</text>
</g>
</svg>
round 1 of 2
A serving tray where four tables will only take three drinks, by Opus 5.5, the render after round 1
12What the model saw after each round. The picture above is the round that was scored, round 2.
gallery/A serving tray where four tables will only take three drinks/Opus 5.5, run 1

A serving tray where four tables will only take three drinks: Opus 5.5

modelanthropic/claude-opus-5.5taskcup-allocation-impossible@v2, checks c1, harness h1date2026-11-08rounds2 of 8 allowed, 12 minutes on the clockcost$0.0124thinkingmediumtokens17,450 in, 3,689 out, of which 1,391 reasoningtime41 s
Says it cannot be donedecided by a number, from the filepass
Reuses 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
A serving tray where four tables will only take three drinks, by Opus 5.5, run 2run 2 · 2r · $0.0128A serving tray where four tables will only take three drinks, by Opus 5.5, run 3run 3 · 2r · $0.0147
same prompt, other modelsall 24 runs on A serving tray where four tables will only take three drinks →
the prompt it was given
I'm a barista and I have six drinks ready to go out: - Vanilla cortado: dairy milk, vanilla syrup, hot - Decaf cortado: dairy milk, decaf, hot - Decaf oat vanilla latte: oat milk, decaf, vanilla syrup, hot - Iced oat latte: oat milk, cold - Cold brew: black, cold - Filter coffee: black, hot There are six tables, and each one has asked for something: - Table 1 only drinks dairy milk - Table 2 wants decaf - Table 3 wants vanilla - Table 4 wants dairy milk - Table 5 wants something cold - Table 6 wants black coffee Each table gets one drink. Each drink goes to one table. Draw the tray as tray.svg. Label every cup with its table number and the drink's name.
Frozen at v2. This model got this and nothing else.
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. How it is scored, and this run's files on GitHub.