Generate Cold Email Follow-Ups That Convert Prospects

Tested prompts for cold email follow up compared across 5 leading AI models.

BEST BY JUDGE SCORE Claude Haiku 4.5 8/10

The prompt we tested

You are an expert cold email copywriter specializing in high-converting follow-up sequences. Based on the context below, write a cold email follow-up that re-engages the prospect, adds new value, and moves the conversation forward toward a reply.

Follow these rules:
Write a single follow-up email under 90 words with a short subject line (max 6 words), a one-line opener that references the prior email without guilt-tripping, one sentence of fresh value or insight, and a low-friction CTA ending in a question; use plain language, no jargon, no exclamation points, and no generic phrases like 'just checking in' or 'circling back'.

Context about the previous outreach, prospect, and goal:
I sent a cold email 5 days ago to the VP of Marketing at a mid-sized SaaS company pitching our analytics tool that helps cut reporting time by 60%. No response yet. I want to follow up with a softer angle and maybe share a relevant customer result from a similar company (Loom reduced their reporting work from 8 hours to 2 hours per week).

Return the follow-up email with a subject line, then the body. Keep it tight, human, and non-pushy.

Model comparison

ModelQualityCostLatencyTokens
Claude Opus 4.7 8 $0.0183 4.3s 383 / 167
Claude Haiku 4.5 8 $0.0008 1.6s 285 / 96
GPT-5.4 8 $0.0018 2.6s 253 / 80
Gemini 2.5 Pro 7 $0.0006 15.4s 261 / 61
Grok 4.1 Fast Reasoning 6 $0.0001 3.9s 402 / 38

Outputs

Claude Opus 4.7 8/10
**Subject:** From 8 hours to 2

Hi [Name],

Wanted to bring one more data point to my note from last week. Loom's marketing team was spending 8 hours a week pulling reporting together; after switching to us, they're down to 2 and using the time for campaign work instead.

Figured it might be relevant given how often SaaS marketing teams get buried in dashboards this time of year.

Worth a 15-minute look to see if the same math could work for your team?

Thanks,
[Your name]
Judge notes: Slightly over 90 words and "this time of year" feels like a mildly generic seasonal filler that a demanding editor would cut.
Claude Haiku 4.5 8/10
**Subject:** One thing we missed

Hi [Name],

Following up on my last note about cutting reporting time.

I was working with a company similar to yours (Loom) who went from 8 hours of weekly reporting to 2 hours—mostly by automating the data pulls and dashboards. Thought that might be relevant.

Would that kind of time savings be useful for your team right now?

[Your name]
Judge notes: Nearly production-ready and follows all rules, but "One thing we missed" is slightly misleading as a subject line since nothing was actually missed—a minor credibility risk that a demanding user would fix before sending.
GPT-5.4 8/10
Subject: Quick example

Wanted to share one relevant example after my note last week.

Loom used our analytics tool to cut weekly reporting work from 8 hours to 2, mainly by pulling campaign and pipeline data into one view instead of stitching it together manually.

If reducing reporting time is even a small priority this quarter, would it be worth sending over a 2-minute walkthrough?
Judge notes: The subject line "Quick example" is functional but slightly generic — a more specific hook (e.g., referencing reporting or the prospect's role) would sharpen it, and the opener phrase "Wanted to share" is a minor soft spot that slightly weakens the human-directness goal.
Gemini 2.5 Pro 7/10
Subject: A thought on reporting time

I sent a note last week about reducing the time your team spends on reporting.

We recently helped another SaaS company, Loom, cut their weekly reporting work from 8 hours down to 2.

Is optimizing your team's reporting workflow currently a priority?
Judge notes: The email is clean and follows most rules well, but "Is optimizing your team's reporting workflow currently a priority?" uses slightly stiff, corporate phrasing and the opener "I sent a note last week" is a marginal improvement over "circling back" without fully adding a fresh angle.
Grok 4.1 Fast Reasoning 6/10
Subject: Loom's reporting shortcut

I emailed last week about our analytics tool.

Loom cut their weekly reporting from 8 hours to 2 with it.

Could this help your team?
Judge notes: The output technically follows the rules and stays tight, but the opener ("I emailed last week about our analytics tool") is flat and wastes the hook, the CTA is too vague to feel genuinely low-friction, and it delivers no fresh value or insight beyond the stat—making it serviceable but needing edits before serious production use.

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