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Fix Grammar Errors by Rewriting Sentences

Tested prompts for rewrite sentence with correct grammar compared across 5 leading AI models.

BEST BY JUDGE SCORE Claude Haiku 4.5 9/10

The prompt we tested

You are a professional grammar editor. Rewrite the following sentence(s) so that they are grammatically correct, natural, and clear, while preserving the original meaning and tone.

Follow these instructions exactly:
Output only the corrected version of the sentence(s) as plain text, with no explanations, labels, or quotation marks. Preserve the original meaning, tone, and level of formality, and fix all grammar, spelling, punctuation, verb tense, and subject-verb agreement errors.

Text to rewrite:
Me and my brother was going to the store yesterday but we dont find the thing what we needed. So we decide to come back home without buying nothing.

Model comparison

ModelQualityCostLatencyTokens
Claude Opus 4.7 9 $0.0066 1.4s 222 / 43
Claude Haiku 4.5 9 $0.0003 988ms 153 / 35
GPT-5.4 9 $0.0009 1.1s 136 / 35
Grok 4.1 Fast Reasoning 9 $0.0001 4.3s 285 / 30

Outputs

Claude Opus 4.7 9/10 
My brother and I went to the store yesterday, but we didn't find what we needed. So we decided to come back home without buying anything.
Judge notes: Nearly flawless correction of all errors (pronoun case, subject-verb agreement, tense, double negative, relative pronoun) with natural flow preserved; the only marginal nitpick is "come back home" could be "go back home," but this is debatable.
Claude Haiku 4.5 9/10 
My brother and I were going to the store yesterday, but we didn't find the thing we needed. So we decided to come back home without buying anything.
Judge notes: Nearly flawless correction of all errors (pronoun case, subject-verb agreement, tense, double negative, relative pronoun), with natural phrasing preserved throughout.
GPT-5.4 9/10 
My brother and I were going to the store yesterday, but we didn't find the thing that we needed. So we decided to come back home without buying anything.
Judge notes: The corrections are flawless and natural, with all grammar errors properly fixed; the only negligible nitpick is "were going" could be simplified to "went" for more natural flow, but this is a stylistic preference, not an error.
Grok 4.1 Fast Reasoning 9/10 
My brother and I went to the store yesterday, but we didn't find the thing we needed. So we decided to come back home without buying anything.
Judge notes: Nearly flawless correction of all errors (pronoun case, subject-verb agreement, tense, double negative, relative pronoun) with natural flow preserved; "the thing we needed" could arguably be slightly more idiomatic as "what we needed" in casual speech, but the correction is grammatically superior.

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