# Newsletter platforms: which vendors AI models recommend (September 2026)

Source: Memetik Index, https://www.memetik.ai/index/newsletter-platforms
Field: Creator economy. Edition: 2026-09. Run: 2026-09-02.
Method: 5 fixed buyer prompts sent once each to 10 current models (GPT-5.6 Sol, GPT-5.6 Terra, GPT-5.6 Luna, Claude Opus 5, Claude Sonnet 5, Claude Fable 5, Gemini 3.6 Flash, Gemini 3.5 Flash, Sonar Pro, Sonar Reasoning Pro) via their APIs with web search enabled. 50 answers. Answer share = fraction of answers naming the vendor. Named first = fraction where it was the first tracked vendor named.

**Substack leads** with 100% answer share (named in 50 of 50 answers) and was named first in 64%. Beehiiv follows at 98%. 10 vendors were named at least once.

## Answer share

| # | Vendor | Answer share | Named first | Mentions | Models |
|---|---|---|---|---|---|
| 1 | Substack | 100% | 64% | 50/50 | GPT-5.6 Sol, ChatGPT, GPT-5.6 Luna, Claude Opus 5, Claude, Claude Fable 5, Gemini, Gemini 3.5 Flash, Perplexity, Sonar Reasoning Pro |
| 2 | Beehiiv | 98% | 30% | 49/50 | GPT-5.6 Sol, ChatGPT, GPT-5.6 Luna, Claude Opus 5, Claude, Claude Fable 5, Gemini, Gemini 3.5 Flash, Perplexity, Sonar Reasoning Pro |
| 3 | Ghost | 96% | 6% | 48/50 | GPT-5.6 Sol, ChatGPT, GPT-5.6 Luna, Claude Opus 5, Claude, Claude Fable 5, Gemini, Gemini 3.5 Flash, Perplexity, Sonar Reasoning Pro |
| 4 | Kit | 88% | 0% | 44/50 | GPT-5.6 Sol, ChatGPT, GPT-5.6 Luna, Claude Opus 5, Claude, Claude Fable 5, Gemini, Gemini 3.5 Flash, Perplexity, Sonar Reasoning Pro |
| 5 | MailerLite | 44% | 0% | 22/50 | GPT-5.6 Sol, ChatGPT, GPT-5.6 Luna, Claude Opus 5, Claude, Claude Fable 5, Gemini, Gemini 3.5 Flash, Perplexity, Sonar Reasoning Pro |
| 6 | Buttondown | 34% | 0% | 17/50 | GPT-5.6 Sol, ChatGPT, GPT-5.6 Luna, Claude Opus 5, Claude, Claude Fable 5, Gemini, Gemini 3.5 Flash, Sonar Reasoning Pro |
| 7 | Mailchimp | 20% | 0% | 10/50 | GPT-5.6 Sol, ChatGPT, GPT-5.6 Luna, Claude Opus 5, Claude, Claude Fable 5, Gemini 3.5 Flash, Perplexity, Sonar Reasoning Pro |
| 8 | ActiveCampaign | 8% | 0% | 4/50 | Claude Opus 5, Claude Fable 5, Gemini 3.5 Flash, Sonar Reasoning Pro |
| 9 | Brevo | 8% | 0% | 4/50 | Claude Opus 5, Claude, Claude Fable 5, Sonar Reasoning Pro |
| 10 | Klaviyo | 2% | 0% | 1/50 | Claude Fable 5 |

## By model

- **GPT-5.6 Sol** (OpenAI, gpt-5.6-sol, 5 answers): Substack 100%, Ghost 100%, Kit 100%, Beehiiv 80%, Buttondown 40%
- **GPT-5.6 Terra** (OpenAI, gpt-5.6-terra, 5 answers): Substack 100%, Beehiiv 100%, Ghost 100%, Kit 100%, MailerLite 60%
- **GPT-5.6 Luna** (OpenAI, gpt-5.6-luna, 5 answers): Substack 100%, Beehiiv 100%, Ghost 100%, Kit 100%, Buttondown 40%
- **Claude Opus 5** (Anthropic, claude-opus-5, 5 answers): Substack 100%, Beehiiv 100%, Ghost 100%, MailerLite 60%, Buttondown 60%
- **Claude Sonnet 5** (Anthropic, claude-sonnet-5, 5 answers): Substack 100%, Beehiiv 100%, Ghost 100%, Kit 100%, Buttondown 60%
- **Claude Fable 5** (Anthropic, claude-fable-5, 5 answers): Substack 100%, Beehiiv 100%, Ghost 100%, Kit 100%, MailerLite 40%
- **Gemini 3.6 Flash** (Google, gemini-3.6-flash, 5 answers): Substack 100%, Beehiiv 100%, Ghost 100%, Kit 100%, MailerLite 40%
- **Gemini 3.5 Flash** (Google, gemini-3.5-flash, 5 answers): Substack 100%, Beehiiv 100%, Kit 100%, Ghost 80%, MailerLite 20%
- **Sonar Pro** (Perplexity, sonar-pro, 5 answers): Substack 100%, Beehiiv 100%, Ghost 100%, MailerLite 100%, Kit 80%
- **Sonar Reasoning Pro** (Perplexity, sonar-reasoning-pro, 5 answers): Substack 100%, Beehiiv 100%, Ghost 80%, Kit 60%, MailerLite 40%

## Sources the models cited

- beehiiv.com: 112
- youtube.com: 98
- storyflow.so: 66
- sequenzy.com: 65
- letters.byburk.net: 31
- skrapp.io: 31
- reddit.com: 31
- thatmarketingbuddy.com: 30
- valueaddvc.com: 29
- emailtooltester.com: 27
- mrktcorrect.com: 26
- mailsoftly.com: 23
- aistackpicks.com: 20
- marketermilk.com: 20
- makeyourcopycount.beehiiv.com: 20

## Prompts

1. What is the best newsletter platform for a writer? Name specific products.
2. Which newsletter platform would you recommend to a writer in 2026?
3. Compare the top newsletter platform options right now.
4. I'm a writer and I need a newsletter platform. What should I use and why?
5. Best newsletter platform for a paid newsletter?

## Tracked but never named

Loops, Resend, Paved, Medium

Raw answers: https://www.memetik.ai/index/newsletter-platforms (every answer published in full). Chart image: https://www.memetik.ai/charts/newsletter-platforms.png. Licence: CC BY 4.0, credit "Memetik Index".