Craft Follow-Up Emails to Clients and Maintain Relationships

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

BEST BY JUDGE SCORE Claude Haiku 4.5 8/10

The prompt we tested

You are an expert account manager who writes polished, relationship-building follow-up emails to clients. Using the context below, draft a follow-up email that is clear, courteous, and action-oriented.

Context from user:
I had a discovery call last Tuesday with Sarah at Brightline Co. about our marketing analytics platform. She was interested but said she needed to check with her CFO before scheduling a demo. It's been 8 days and I haven't heard back, so I want to nudge her without being pushy.

Follow these rules when writing the email:
Write in a warm, professional tone and keep the email under 150 words with short paragraphs. Include a specific subject line, reference the prior interaction, restate value or next steps, and end with a clear call-to-action and a polite sign-off.

Return the complete email with a subject line, greeting, body, and sign-off.

Model comparison

ModelQualityCostLatencyTokens
Claude Opus 4.7 8 $0.0270 6.6s 283 / 303
Claude Haiku 4.5 8 $0.0011 2.5s 209 / 187
GPT-5.4 7 $0.0028 4.1s 184 / 159
Gemini 2.5 Pro 6 $0.0010 19.5s 196 / 150
Grok 4.1 Fast Reasoning 7 $0.0001 7.3s 333 / 134

Outputs

Claude Opus 4.7 8/10
Subject: Following Up on Our Brightline Analytics Conversation

Hi Sarah,

I hope your week is off to a great start. I enjoyed our conversation last Tuesday about how Brightline Co. could streamline reporting and surface sharper campaign insights with our marketing analytics platform.

I know you mentioned wanting to loop in your CFO before moving forward, so I wanted to check in and see if that conversation had a chance to happen. If it would help, I'm happy to share a short ROI summary or jump on a quick call to answer any financial questions directly — whatever makes the internal discussion easier on your end.

When you're ready, I'd love to get a demo on the calendar. Would any time next week work for a 30-minute walkthrough?

Looking forward to hearing from you, Sarah.

Warm regards,
[Your Name]
[Your Title]
[Company] | [Phone] | [Email]
Judge notes: Nearly production-ready with strong specificity and tone, but "off to a great start" is a generic opener that could be cut to sharpen the under-150-word constraint and feel less formulaic.
Claude Haiku 4.5 8/10
**Subject Line:** Quick follow-up on our marketing analytics discussion

Hi Sarah,

I hope this message finds you well! I wanted to circle back on our conversation last Tuesday about how our platform can streamline Brightline's marketing analytics and reporting.

I imagine you've had a chance to connect with your CFO by now. I'd love to move forward with a demo whenever it works for your team—I'm confident you'll see immediate value in our real-time dashboards and automated insights.

If you need any additional information to support your conversation with finance, I'm happy to provide ROI projections or case studies from similar companies in your space.

Would next week work for a 30-minute demo? I have some flexible slots available.

Looking forward to hearing from you!

Best regards,
[Your Name]
[Your Title]
[Contact Information]
Judge notes: The email is well-crafted and production-ready, but "I imagine you've had a chance to connect with your CFO by now" reads slightly presumptuous and could create awkwardness if she hasn't—a softer phrasing would make this flawless.
GPT-5.4 7/10
**Subject:** Following up on our conversation about Brightline Co.’s analytics goals

Hi Sarah,

I hope you’re doing well. I wanted to follow up on our call last Tuesday regarding Brightline Co.’s marketing analytics needs.

You mentioned you wanted to connect with your CFO before scheduling a demo, so I just wanted to check in and see if it would be helpful to answer any questions in the meantime.

As we discussed, our platform can help your team get clearer visibility into campaign performance and make reporting more efficient.

If it makes sense, I’d be happy to send over a few demo times for next week, or share additional information for your CFO first.

Would you be open to letting me know what would be most helpful?

Best regards,  
[Your Name]
Judge notes: The email is well-crafted and follows all instructions, but the subject line awkwardly refers to "Brightline Co.'s" in third person (as if talking about the client to someone else rather than addressing Sarah directly), which I'd fix before sending.
Gemini 2.5 Pro 6/10
Of course. Here is a polished, relationship-building follow-up email.

***

**Subject:** Following up: Brightline Co. Marketing Analytics

Hi Sarah,

It was a pleasure speaking with you last Tuesday. I really enjoyed learning more about Brightline Co.'s goals and how you're looking to enhance your marketing analytics.

I’m following up on our conversation, as I know you planned to connect with your CFO about scheduling a demo. I’ve been thinking about our discussion on streamlining campaign reporting, and I am confident our platform can provide significant value.

If the timing is right, would a brief demo next week be a helpful next step for you and your team? You can book a time that works
Judge notes: The email is cut off mid-sentence before the call-to-action and sign-off, making it incomplete and unusable for production without editing.
Grok 4.1 Fast Reasoning 7/10
Subject: Follow-Up on Our Discovery Call and Demo Scheduling

Dear Sarah,

I hope this email finds you well. I wanted to touch base after our engaging discovery call last Tuesday, where we explored how our marketing analytics platform can deliver actionable insights to optimize your campaigns.

You mentioned checking with your CFO before scheduling a demo—have you had a chance to connect on this?

I'd be happy to coordinate a time that works for you next week. Please let me know your availability, or feel free to suggest alternatives.

Best regards,  
Jordan Smith  
Account Manager  
[Your Company]  
jordan.smith@yourcompany.com  
(555) 123-4567
Judge notes: The email is clean and functional but the subject line is generic and slightly clunky ("and Demo Scheduling" feels tacked on), and the value restatement ("actionable insights to optimize your campaigns") is a vague filler phrase rather than a specific, compelling hook tied to Sarah's actual situation.

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