AI Tools That Rewrite Sentences Automatically

Tested prompts for ai to rewrite sentences compared across 5 leading AI models.

BEST BY JUDGE SCORE Claude Opus 4.7 8/10

The prompt we tested

You are an expert sentence rewriter. Rewrite the following sentence(s) to improve clarity, flow, and word choice while preserving the original meaning.

Rules:
Keep each rewrite roughly the same length as the original, maintain the original tone unless it's clearly broken, and do not add new facts or remove key information. Use natural, human-sounding English and vary sentence structure across the three versions.

Original sentence(s):
Our new product is really good and it has a lot of features that customers will like a lot. We think it will sell well because it solves problems that other products don't solve.

Return 3 distinct rewritten versions as a numbered list. After the list, add a one-line note explaining the main change you made in each version.

Model comparison

ModelQualityCostLatencyTokens
Claude Opus 4.7 8 $0.0264 6.2s 239 / 304
Claude Haiku 4.5 7 $0.0013 3.3s 173 / 227
GPT-5.4 7 $0.0026 3.4s 154 / 147
Gemini 2.5 Pro 1 $0.0003 17.0s 160 / 29
Grok 4.1 Fast Reasoning 7 $0.0001 4.1s 303 / 157

Outputs

Claude Opus 4.7 8/10
Here are three rewritten versions:

1. Our new product is excellent and packed with features customers will love. We expect strong sales because it solves problems that competing products simply don't address.

2. We're proud of our new product—it offers a range of features customers are sure to appreciate. Because it tackles problems other products leave unsolved, we believe it will sell well.

3. Our new product stands out for its impressive set of customer-friendly features. It should perform well in the market, since it addresses pain points that rival products overlook.

**Notes on changes:**
- Version 1: Tightened wording and replaced vague phrases ("really good," "a lot") with more precise language.
- Version 2: Restructured the sentences with a dash and a cause-first clause to vary rhythm and add a more personal tone.
- Version 3: Used more professional, marketing-oriented vocabulary ("stands out," "pain points," "rival products") for a polished feel.
Judge notes: Output is clean and production-ready, but "pain points" in Version 3 slightly shifts the register beyond the original's neutral tone, and the notes section uses bold formatting not specified in the instructions.
Claude Haiku 4.5 7/10
# Three Rewritten Versions

1. Our new product offers a comprehensive feature set designed to address customer pain points that competitors haven't tackled, positioning it well for strong market performance.

2. We're confident this product will perform well in the market because it delivers features customers want and solves problems our competitors have overlooked.

3. With its robust feature lineup and ability to solve unmet customer needs, our new product is poised to be a strong seller in the marketplace.

---

**Notes:**
1. **Version 1:** Replaced vague praise ("really good," "a lot") with concrete language ("comprehensive feature set," "pain points") and elevated the tone to be more professional.

2. **Version 2:** Streamlined the sentence structure, eliminated redundancy ("like a lot"), and made the competitive advantage more explicit while maintaining a conversational tone.

3. **Version 3:** Reordered the logic to lead with the product's strengths, then connect them to market success, creating a more persuasive flow.
Judge notes: The rewrites are competent and varied, but Version 1 significantly shifts the original's casual/enthusiastic tone toward corporate jargon ("pain points," "positioning"), violating the rule to maintain original tone unless clearly broken.
GPT-5.4 7/10
1. Our new product is excellent, with a wide range of features that customers will really appreciate. We believe it will sell well because it solves problems other products do not.

2. Our new product is very strong and offers many features customers are likely to enjoy. We expect it to perform well in the market because it addresses problems that other products fail to solve.

3. Our new product stands out for its quality and the many features customers will value. We think it will sell well because it solves problems that competing products do not.

Main changes: 1) tightened repetition and improved flow, 2) made the phrasing more polished and market-focused, 3) emphasized product quality and clearer contrast with competitors.
Judge notes: The rewrites competently improve word choice and reduce redundancy, but the versions are not sufficiently distinct from each other—they feel like minor variations rather than meaningfully different structural or tonal approaches, and the explanatory notes are vague rather than specific about the actual changes made.
Gemini 2.5 Pro 1/10
1.  Our new product is exceptional, offering a host of compelling features that customers will find invaluable. We expect it to sell well because it
Judge notes: The output is truncated mid-sentence and completely incomplete, failing to deliver even one full rewrite let alone three versions with explanatory notes.
Grok 4.1 Fast Reasoning 7/10
1. Our new product is excellent and packed with features customers will love. We expect strong sales because it tackles problems other products ignore.

2. Customers will really love the many features in our outstanding new product. It should sell well since it solves issues competitors overlook.

3. With tons of features customers will adore, our new product is top-notch. We'll see great sales as it fixes problems no other product addresses.

- Version 1: Combined repetitive phrasing into tighter wording and varied structure for smoother flow.
- Version 2: Repositioned customer focus first and used synonyms like "outstanding" for fresher word choice.
- Version 3: Started each sentence with key benefits and swapped "a lot" for "tons" and "adore" to enhance casual enthusiasm.
Judge notes: The rewrites are clean and functional, but Version 3's "tons of features" and "top-notch" trade vague casual language for different vague casual language rather than genuinely improving clarity, and the explanatory notes are somewhat generic.

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