Overall Winners Across All Variations
The Take
GPT-5.4 consistently nailed conversion-focused copy without falling into generic “boost productivity” traps. Kimi K2.5 was shockingly fast (1.3-1.9s) while delivering bold angles like “Your Pipeline Is Leaking Revenue.”
MiniMax M2.1 had a complete pattern failure—exposed 288-443 word reasoning chains in all three variations instead of delivering clean copy. This isn’t a one-off bug, it’s a fundamental output formatting problem.
Claude Sonnet 4.6 wrote the best copy but struggled with constraints—went 6 words over limit on Variation 2, invented product names when not asked. Shows the tradeoff between creative quality and following strict requirements.
Ultra-concise hero for B2B SaaS—tests which models can be punchy without being generic.
The Prompt
Write a landing page hero section for an AI-powered email automation tool for B2B sales teams. Requirements: - Under 30 words total - One headline + one subhead - Focus on outcome, not features - Create urgency or curiosity - No "revolutionize" or "game-changer" clichés
Model Results
GPT-5.4
Kimi K2.5
MiniMax M2.1
Claude Sonnet 4.6
Qwen3 235B
DeepSeek V3
Gemini 3.1 Pro
Grok 4.20 Reasoning
Mid-length hero with pain point + metric—tests balance between detail and brevity.
The Prompt
Write a landing page hero section for a project management tool designed for remote-first creative agencies (5-50 employees). Requirements: - Under 50 words total - Headline + subhead + short value prop - Include one specific pain point (e.g., "scattered tools" or "missed deadlines") - Include one concrete metric or result - No generic "boost productivity" language
Model Results
GPT-5.4
Kimi K2.5
MiniMax M2.1
Claude Sonnet 4.6
Qwen3 235B
DeepSeek V3
Gemini 3.1 Pro
Grok 4.20 Reasoning
Physical product with ergonomics angle—tests B2C vs B2B copywriting style.
The Prompt
Write a landing page hero section for a premium standing desk targeted at remote workers. Requirements: - Under 60 words - Headline + subhead - Address the WFH ergonomics problem - Include one differentiator (e.g., "height memory presets") - Call out the target audience explicitly - CTA: "Shop Now"
Model Results
GPT-5.4
Kimi K2.5
MiniMax M2.1
Claude Sonnet 4.6
Qwen3 235B
DeepSeek V3
Gemini 3.1 Pro
Grok 4.20 Reasoning
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Models We Didn't Test
ChatGPT Plus UI: Subscription-only web interface, not API-accessible for programmatic testing
o1-preview / o1-mini: Reasoning models optimized for complex problem-solving, not marketing copy—would likely expose reasoning chains like MiniMax
Llama 3.3 70B: Open-source model requiring self-hosting; most marketing teams use managed API services
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