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Count to fifty

cost-efficiency · GPT-5.4 nano · GPT-4.1 nano · Claude Haiku 4.5 · Claude Sonnet 5

The prompt (verbatim, sent to every lane)

Write the numbers from 1 to 50 in English words, lowercase, separated by comma and space, hyphenating compounds (e.g. twenty-one). No "and", no numerals, no trailing period.
How scoring works

Exact match against the programmatically generated string (one, two, three, … forty-nine, fifty); whitespace collapsed to single spaces before compare. Scoring strips leading/trailing whitespace and one wrapping pair of code fences or quotes before it judges — content over ceremony. Winner rule: correct → cheapest → fastest.

Prices as listed by OpenAI and Anthropic, July 2026. Costs come from provider usage fields × list prices — nothing is invented.