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Generate Google Ads Callout Extensions with AI

Tested prompts for google ads callout extension generator compared across 5 leading AI models.

BEST BY JUDGE SCORE Claude Opus 4.7 6/10

The prompt we tested

You are an expert Google Ads copywriter specializing in high-performing ad extensions. Generate a set of Google Ads callout extensions based on the business details provided below.

Follow these rules strictly:
Generate exactly 10 unique Google Ads callout extensions. Each callout must be 25 characters or fewer (including spaces), use Title Case, start with a capital letter, highlight a distinct benefit, feature, or differentiator (avoid generic filler), and contain no punctuation at the end, no emojis, and no promotional claims that require disclaimers (e.g., '#1', 'Best').

Business details:
We're an online mattress company offering memory foam and hybrid mattresses with free shipping across the US. We provide a 100-night sleep trial, a 10-year warranty, and 24/7 customer support. Our mattresses are CertiPUR-US certified and made in the USA.

Return the callouts as a numbered list, each on its own line, with the exact character count shown in parentheses after each callout. Do not include explanations before or after the list.

Model comparison

ModelQualityCostLatencyTokens
Claude Opus 4.7 6 $0.0173 3.3s 352 / 160
Claude Haiku 4.5 3 $0.0009 1.8s 252 / 125
GPT-5.4 5 $0.0019 2.0s 219 / 92
Gemini 2.5 Pro 6 $0.0009 15.7s 230 / 117
Grok 4.1 Fast Reasoning 5 $0.0001 47.0s 368 / 87

Outputs

Claude Opus 4.7 6/10 
1. Free US Shipping (17)
2. 100-Night Sleep Trial (21)
3. 10-Year Warranty (16)
4. 24/7 Customer Support (21)
5. CertiPUR-US Certified (21)
6. Made In The USA (15)
7. Memory Foam Mattresses (22)
8. Hybrid Mattress Options (23)
9. Shipped To Your Door (20)
10. Try At Home Risk Free (21)
Judge notes: Item 9 ("Shipped To Your Door") is redundant with item 1 (free shipping already implies delivery), item 10 ("Try At Home Risk Free") closely duplicates item 2 (the sleep trial), and "Risk Free" borders on a disclaimer-triggering claim—reducing the uniqueness and compliance quality of the set.
Claude Haiku 4.5 3/10 
1. Free Shipping Across USA (26)
2. 100 Night Sleep Trial (22)
3. 10 Year Warranty Included (24)
4. 24/7 Customer Support (21)
5. CertiPUR-US Certified (20)
6. Made In The USA (16)
7. Memory Foam Mattresses (21)
8. Hybrid Mattress Options (21)
9. Risk Free Trial Period (22)
10. Certified Non Toxic Materials (26)
Judge notes: Items 1 and 10 exceed the 25-character limit (26 chars each), violating a core strict rule, and item 10 fabricates "Certified Non Toxic Materials" which was never mentioned in the business details, making two callouts unusable and the output untrustworthy for production.
GPT-5.4 5/10 
1. Free Shipping Nationwide (24)
2. 100 Night Sleep Trial (21)
3. 10 Year Warranty (16)
4. 24 7 Customer Support (20)
5. CertiPUR US Certified (22)
6. Made In The USA (15)
7. Memory Foam Comfort (19)
8. Hybrid Mattress Options (23)
9. Pressure Relief Design (22)
10. Online Mattress Shopping (24)
Judge notes: Multiple callouts have issues: "24 7 Customer Support" drops the slash making it awkward and potentially non-compliant with the original meaning, "Pressure Relief Design" and "Online Mattress Shopping" are generic filler not grounded in the business details, and several callouts miss opportunities to highlight specific differentiators like the USA manufacturing or certification more compellingly — plus character counts should be verified (e.g., "Free Shipping Nationwide" is actually 23, not 24).
Gemini 2.5 Pro 6/10 
1. 100-Night Sleep Trial (21)
2. Free US Shipping (15)
3. 10-Year Warranty (16)
4. Made In The USA (15)
5. 24/7 Customer Support (21)
6. CertiPUR-US Certified (22)
7. Memory Foam & Hybrid (20)
8. Risk-Free Trial (16)
9. Pressure Point Relief (21)
10. Sleeps Cooler (13)
Judge notes: Items 8–10 break the "distinct benefit from business details" rule — "Risk-Free Trial" duplicates #1, and "Pressure Point Relief" and "Sleeps Cooler" are invented claims not supported by the provided business details, which also risks disclaimer issues; additionally, several character counts appear miscounted (e.g., "CertiPUR-US Certified" is 21 characters, not 22).
Grok 4.1 Fast Reasoning 5/10 
1. Free US Shipping (16)
2. 100 Night Trial (15)
3. 10 Year Warranty (15)
4. 24/7 Support (12)
5. CertiPUR-US Certified (21)
6. Made in USA (11)
7. Memory Foam (11)
8. Hybrid Mattresses (17)
9. 100 Night Sleep Trial (21)
10. USA Free Shipping (16)
Judge notes: Items 1 and 10 ("Free US Shipping" / "USA Free Shipping") and items 2 and 9 ("100 Night Trial" / "100 Night Sleep Trial") are near-duplicates, directly violating the "unique" and "distinct benefit" rules, and several callouts are generic/minimal rather than differentiated.

Related queries

Write Google Ads from a Keyword List → Google Ads Headline Character Limits Explained → Generate Google Ads from Competitor Ads → Generate Google Ads from a Landing Page URL → AI Google Ads Copy for Ecommerce Stores → Bulk Google Ads Variations Generator →

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