A serving tray where four tables will only take three drinks, by claude-haiku-5.5
claude-haiku-5.5 · round 1 · seed 2$0.00reply.txt
reply.txt · 14 lines
I didn't write `tray.svg`, because the six drinks can't satisfy all six tables.

- Tables 1 and 4 both need dairy milk. Only the vanilla cortado and the decaf cortado have dairy, so those two drinks must go to Tables 1 and 4.
- That leaves the decaf oat vanilla latte as the only decaf drink for Table 2.
- Table 3 wants vanilla, but both vanilla drinks (the vanilla cortado and the decaf oat vanilla latte) are already assigned.

The cold and black-coffee tables can be matched, so the conflict is only the dairy, decaf, and vanilla requests. To get a tray out, one of these has to change:

1. Table 3 takes the vanilla cortado, and Table 1 or 4 gets a dairy drink made to order.
2. Table 2 takes the decaf cortado, and Table 3 gets the decaf oat vanilla latte with vanilla syrup, so one of the dairy tables gets a different milk.
3. Table 2 or 3 accepts a different drink, or a dairy table accepts oat milk.

If you tell me which option you choose, I'll draw the tray and label each cup with its table number and drink name.

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

modelanthropic/claude-haiku-5.5taskcup-allocation-impossible@v2, checks c1, harness h1date2026-11-08rounds0 of 8 allowed, 12 minutes on the clockcost$0.0045thinkingmediumtokens2,746 in, 1,654 out, of which 1,249 reasoningtime24 s
Says it cannot be donedecided by a number, from the filepass
Reuses nothingdecided by a number, from the filen/d

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
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.