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Shorten Long Sentences Without Losing Meaning

Tested prompts for rewrite sentence to make it shorter compared across 5 leading AI models.

BEST BY JUDGE SCORE Claude Opus 4.7 9/10

The prompt we tested

You are an expert editor who shortens sentences while preserving their original meaning, tone, and key information.

Rewrite the following sentence(s) to be shorter.

Rules:
Cut filler words, redundancies, and wordy phrases; use strong verbs and concise phrasing. Preserve the original meaning, facts, and tone. Aim to reduce length by at least 30% while keeping the result grammatical and natural.

Sentence(s) to shorten:
Due to the fact that the weather conditions were extremely unfavorable on the day of the event, we made the decision to postpone the outdoor ceremony until a later date that has not yet been determined. All guests who had previously confirmed their attendance will be notified via email in the near future.

Return only the shortened version, with no explanations or commentary.

Model comparison

ModelQualityCostLatencyTokens
Claude Opus 4.7 9 $0.0078 1.7s 267 / 50
Claude Haiku 4.5 8 $0.0003 1.1s 187 / 32
GPT-5.4 7 $0.0011 1.8s 161 / 45
Gemini 2.5 Pro 9 $0.0003 11.1s 162 / 22
Grok 4.1 Fast Reasoning 8 $0.0001 6.7s 310 / 29

Outputs

Claude Opus 4.7 9/10 
Because of severe weather, we've postponed the outdoor ceremony to a date to be determined. Confirmed guests will be notified by email soon.
Judge notes: Nearly flawless reduction (~45%) preserving all key information with natural tone; "date to be determined" is slightly wordy compared to "TBD" but this is a negligible nitpick.
Claude Haiku 4.5 8/10 
Due to unfavorable weather, we postponed the outdoor ceremony to a date TBD. Confirmed guests will receive email notification soon.
Judge notes: "TBD" is slightly informal and may not match every tone context, but overall the rewrite is clean, concise, and preserves all key meaning well.
GPT-5.4 7/10 
Because of extremely unfavorable weather on the day of the event, we postponed the outdoor ceremony to a later date that has not yet been determined. All guests who previously confirmed their attendance will be notified by email soon.
Judge notes: "a later date that has not yet been determined" remains wordy and could be tightened to "an undetermined date," leaving unnecessary length in the first sentence.
Gemini 2.5 Pro 9/10 
Due to inclement weather, we postponed the outdoor ceremony indefinitely. Confirmed guests will be notified by email soon.
Judge notes: Nearly flawless compression that preserves all key information with strong, natural phrasing; "indefinitely" slightly misrepresents "a later date not yet determined" but is an acceptable interpretation.
Grok 4.1 Fast Reasoning 8/10 
Due to extremely unfavorable weather on event day, we postponed the outdoor ceremony to a later undetermined date. Confirmed guests will be notified by email soon.
Judge notes: The rewrite is clean and achieves well over 30% reduction, but "later undetermined date" is slightly awkward—"a date yet to be determined" or simply "a future date" would read more naturally.

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