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Simplify Complex Sentences into Plain English

Tested prompts for rewrite sentence in simple english compared across 5 leading AI models.

BEST BY JUDGE SCORE Claude Haiku 4.5 8/10

The prompt we tested

Rewrite the following sentence(s) in simple English so that anyone, including a non-native speaker or a young reader, can easily understand.

Follow these instructions carefully:
Use short sentences, everyday words, and active voice. Replace jargon, idioms, and complex vocabulary with plain equivalents while keeping the original meaning intact. Return only the rewritten text, with no explanations or extra commentary.

Original text:
Notwithstanding the inclement weather conditions that persisted throughout the morning, the organizing committee unanimously resolved to proceed with the scheduled outdoor festivities. Attendees were subsequently advised to equip themselves with appropriate protective attire.

Simplified version:

Model comparison

ModelQualityCostLatencyTokens
Claude Opus 4.7 8 $0.0083 2.6s 242 / 62
Claude Haiku 4.5 8 $0.0003 716ms 151 / 32
GPT-5.4 8 $0.0009 1.3s 127 / 38
Gemini 2.5 Pro 8 $0.0003 15.6s 123 / 34
Grok 4.1 Fast Reasoning 8 $0.0001 5.3s 274 / 29

Outputs

Claude Opus 4.7 8/10 
Even though the bad weather lasted all morning, the planning team all agreed to go ahead with the outdoor events. They then told guests to bring the right clothes to stay dry and warm.
Judge notes: "bring the right clothes to stay dry and warm" slightly narrows the meaning (original says "protective attire," not specifically rain/cold gear), but otherwise this is clean, accurate, and natural plain English.
Claude Haiku 4.5 8/10 
Despite the bad weather in the morning, the organizing committee decided to continue with the outdoor event. They told all attendees to wear protective clothing.
Judge notes: "Protective clothing" is slightly vague compared to specifying what kind of protection, and "attendees" could be simplified to "people" or "guests," but overall this is clean, accurate, and production-ready.
GPT-5.4 8/10 
Even though the bad weather lasted all morning, the committee agreed to go ahead with the outdoor event as planned. They then told people to wear the right clothes to protect themselves.
Judge notes: "Wear the right clothes to protect themselves" is slightly vague—"dress warmly" or "wear weather-appropriate clothing like a raincoat or umbrella" would be more accessible to a young or non-native reader.
Gemini 2.5 Pro 8/10 
The weather was bad all morning.
Still, the organizers agreed to have the outdoor party as planned.
They told everyone to wear the right clothes for the weather.
Judge notes: Very clean simplification, but "wear the right clothes for the weather" slightly loses the specificity of "protective attire" (e.g., rain gear/warm clothes), which a minor edit could sharpen.
Grok 4.1 Fast Reasoning 8/10 
Bad weather lasted all morning. The event organizers all agreed to go ahead with the outdoor party. They told people to wear the right protective clothes.
Judge notes: "Wear the right protective clothes" is slightly vague—specifying rain gear or weather-appropriate clothing would be more precise, but overall this is clean, accurate, and production-ready.

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