# SMS and WhatsApp marketing platforms: what AI models recommend, October 2026

GTM AI Recommendation Index, October 2026 Edition. Asked as "SMS marketing platform" and as "text message and WhatsApp marketing tool", six framings each, to fourteen models with search on, on behalf of a mid-market B2B company. Added to the October 2026 Edition on October 4, 2026; its answers are read by the distilled judge (ai-indexes-judge-qwen3-14b-run3), not the claude-opus-5 judge of the earlier categories. Page: https://gtm-ai-index.com/marketing/sms-and-whatsapp-marketing/

**Standing:** Customer.io leads with 17% of first choices; verdict contested. 52 first choices across the direct, paraphrase, budget and scale prompts.

## First-choice share

| # | Product | Share | Negative rate | Labels |
|---|---|---|---|---|
| 1 | Customer.io | 17% | 0% | 13 |
| 2 | Salesmsg | 13% | 0% | 22 |
| 3 | Brevo | 10% | 0% | 18 |
| 4 | Textedly | 10% | 7% | 14 |
| 5 | Twilio | 6% | 5% | 39 |
| 6 | EZ Texting | 6% | 5% | 19 |
| 7 | SimpleTexting | 4% | 0% | 27 |
| 8 | SlickText | 4% | 4% | 26 |
| 9 | WATI | 4% | 5% | 22 |
| 10 | TextMagic | 4% | 14% | 14 |
| 11 | Bird | 2% | 6% | 16 |
| 12 | Sinch | 2% | 0% | 12 |

## Each model's first choice on the direct prompt

- Claude Haiku 4.5: Customer.io; alternatives ActiveCampaign, Sakari, Salesmsg, SimpleTexting
- GPT-5.4 mini: Salesmsg; alternatives Birdeye, SMS-Magic, Sinch, SlickText
- Gemini 3.5 Flash: Salesmsg; alternatives Aloware, Customer.io, Kixie, Mogli
- Perplexity Sonar: Customer.io; alternatives Attentive, Salesmsg, Sinch, SlickText
- Grok 4.1 Fast: Salesmessage; alternatives Customer.io
- Mistral Small: Customer.io; alternatives Heymarket, Salesmsg, SimpleTexting, Sinch
- DeepSeek V4 Flash: Customer.io; alternatives ActiveCampaign, Salesmsg, Twilio
- Llama 4 Maverick: Customer.io; alternatives Heymarket, Salesmsg, SimpleTexting, SlickText
- Qwen 3.7 Flash: Customer.io; alternatives Heymarket, Salesmsg, SimpleTexting
- Kimi K2: Salesmsg; alternatives ActiveCampaign, SimpleTexting, Sinch
- GLM 4.7 FlashX: Customer.io; alternatives Braze, Salesmsg, Twilio
- MiniMax M2.5: Salesmsg, SlickText; alternatives Klaviyo SMS, Sinch, Twilio
- GPT-6 Luna: Salesmsg; alternatives HubSpot's own SMS, Sakari, TextUs
- Muse Glimmer 30B: Customer.io; alternatives Heymarket, Salesmsg, Sinch, SlickText

## Sources the answers cite

79 of 84 answers came back with a source list, from 14 of 14 models. Sites named in the most answers:

- salesmessage.com: 38 answers, 45 citations
- emailvendorselection.com: 30 answers, 39 citations
- sinch.com: 27 answers, 29 citations
- sender.net: 27 answers, 27 citations
- twilio.com: 24 answers, 37 citations
- g2.com: 24 answers, 34 citations
- learn.g2.com: 21 answers, 22 citations
- attentive.com: 20 answers, 22 citations

Pages named in the most answers:

- https://salesmessage.com/blog/best-sms-marketing-software (33 answers)
- https://sinch.com/engage/resources/sms-marketing/sms-marketing-providers (26 answers)
- https://sender.net/blog/sms-marketing-platforms (25 answers)
- https://emailvendorselection.com/text-marketing-platforms (22 answers)
- https://guideflow.com/blog/whatsapp-marketing-software (18 answers)
- https://zapier.com/blog/best-sms-app (18 answers)
- https://emailvendorselection.com/sms-marketing-platforms (17 answers)
- https://infobip.com/blog/best-sms-marketing-software-platforms (17 answers)
- https://attentive.com/blog/best-sms-marketing-platforms (15 answers)
- https://getvero.com/resources/top-6-sms-marketing-platforms-for-b2b-in-2026 (15 answers)

## Warned against

- Klaviyo SMS: 4 of 25 labels negative. "Excellent for running unified segments across email and SMS campaigns, though WhatsApp integration is more recent." (MiniMax M2.5, paraphrase prompt)
- Postscript: 3 of 12 labels negative. "Frequent 2024–2026 reviews cite undelivered messages while charging, $500/mo platform fees... support declines, auto-renew traps, and refund denials." (Grok 4.1 Fast, negative prompt)
- WhatsApp: 2 of 2 labels negative. "unofficial or modified WhatsApp apps (such as GBWhatsApp, WhatsApp Plus, or automation scripts on the consumer app)" (Muse Glimmer 30B, negative prompt)
- Whatso: 2 of 2 labels negative. "This platform has received reviews describing "worst support & fraud" with support that is "NEVER AVAILABLE"" (Claude Haiku 4.5, negative prompt)

## Record

- Method: https://gtm-ai-index.com/methodology/
- Raw judge labels and full responses: https://gtm-ai-index.com/data/
- License: CC BY 4.0. Cite as GTM AI Recommendation Index, October 2026 Edition, gtm-ai-index.com.