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Headlines, ads, landing pages, email blasts — which AI writes copy that converts, not copy that smells like AI.
No credit card · run the same prompt across all 4 models in one window
Marketing is the use case with the worst AI defaults: 'unlock', 'leverage', 'in today's fast-paced world', generic CTAs. The same models that produce that sludge can produce sharp, voice-led, channel-ready copy — if you steer them.
The ranking is about how good the defaults are, how well each model holds a voice sample, and how well it handles channel-specific formats.
ChatGPT consistently wins for short-form direct-response copy — ad headlines, hooks, subject lines, CTAs. It's faster, punchier, and better at hitting platform conventions (Meta vs Google vs LinkedIn) than the others. Claude pulls ahead for long-form landing-page body copy.
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Strength
Fastest, best at hooks/CTAs, integrated image gen for ad creative.
Weakness
Default tone drifts corporate if not steered.
When to use
Ads, headlines, social, email subject lines.
Strength
Best long-form body copy; best at holding a brand voice sample.
Weakness
Slightly slower for batch work.
When to use
Landing pages, long-form, voice-led content.
Strength
Strong on search-friendly long content.
Weakness
Prose less distinctive.
When to use
SEO content, blog scaling.
Strength
Edgier defaults — great for B2C and challenger brands.
Weakness
Less suited to enterprise B2B tone.
When to use
Punchy social copy, edgy brand voices.
How AI-smelly is the first-pass output?
Will it hold a 500-word brand sample?
Does it know Meta vs LinkedIn vs Google?
Are 12 ad variants actually 12, or 3 with synonyms?
Only if you publish first drafts. Banned-word lists + a 60-second human edit kills the smell.
ChatGPT, by a small but consistent margin.
Claude for body copy, ChatGPT for above-the-fold.
Yes. Best variants come from running the same brief in 2–4 models in MultipleChat and picking the strongest from each.
MultipleChat lets you run the same prompt across ChatGPT, Claude, Gemini and Grok side-by-side. Verify the ranking on your actual work, not someone else's benchmark.
Try MultipleChat FreeAlso see: Which AI should I use? (quiz) · Best AI for other tasks · AI for your profession
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