Cold email: same prompt, different AI
Task: A short, personal cold email that gets a reply. Below is the same job written the way each tool works best. All prompts are RuleStack originals (MIT). We describe how prompting differs, not which tool is "best": we haven't run benchmarks, and results change with every model update.
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ChatGPT
Asking for several versions in one go makes it easy to pick and mix.
Write a cold email to [name, role] at [company].
Why them: [specific trigger, e.g. they just opened a second warehouse].
What I offer: [offer] with proof [one result].
Rules: under 90 words, no buzzwords, one clear question as the call to action, subject line under 6 words. Give 3 versions with different openers.Claude
Claude follows tagged context well, and asking for a self-critique catches clichés.
I need a cold email that sounds like a thoughtful person, not a template.
<context>Recipient: [name, role, company]. Trigger: [trigger]. My offer: [offer]. Proof: [result].</context>
<rules>Under 90 words. No flattery or buzzwords. End with one low-effort question.</rules>
Write one email and a subject line, then tell me the weakest sentence and how to fix it.Gemini
Gemini fits if you work in Gmail; ask it to say where any researched detail came from.
Draft a cold email to [name] at [company] in Gmail-ready format (subject + body). Use this context: [trigger, offer, proof]. Keep it under 90 words, friendly and direct, with one question at the end. If you can see public info about [company] via search, mention one relevant recent detail and tell me where it came from.Grok
Grok is handy for a casual DM variant alongside the email.
Write a punchy cold email to [name, role at company] about [offer]. Hook: [trigger]. Proof: [result]. Max 80 words, plain language, no hype, one question to close. Then give a more casual version I could send as a LinkedIn or X DM.Microsoft Copilot
Fits Outlook users; ask for a paste-ready format.
Write a professional cold email to [name] at [company] about [offer]. Context: [trigger]; proof: [result]. Under 100 words, warm but concise, one question as the call to action. Format it so I can paste it into Outlook, with a subject line.How they differ
- All chat models can write this well; the difference is mostly how you supply context. Specific triggers and proof matter more than which tool you use.
- Claude-style XML tags and ChatGPT-style bullet rules both help models separate facts from instructions.
- Never let a model invent facts about the recipient. Give the trigger yourself or ask the tool to cite where it found it.
Replace everything in [square brackets] with your details. More: Sales prompts · all comparisons