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Compared with asking the same thing without the length and format lines.estimate

Estimated output tokens

700

Asked loosely

700

This prompt

Energy (Wh)

1.215

Asked loosely

1.215

This prompt

Tokens estimated from characters; energy measured by Jegham et al. 2025.

A shorter answer, but the same energy band — the measurements are per band.

Reported backfire — Specifying output lengthSpecifying a length longer than needed backfires (a 34% increase in 11% of scenarios)

Where these figures come from

Published figures for the rule itself — not what this prompt saves.

Specifying output length

38.7%mean reduction · 95% CI 29.7–47.7%

Podder et al. 2026 BP#5 · 18 use cases / 57 prompts

by modelGPT-4o 35%Command R+ 49%Mistral-7B 32%

Reduced in every scenario. No backfire reported