# Customer.io vs Klaviyo: which do AI models recommend for mobile & push, October 2026

GTM AI Recommendation Index, October 2026 Edition, Mobile marketing and push. Six of fourteen models named Customer.io first on the direct prompt; zero named Klaviyo. Page: https://gtm-ai-index.com/marketing/mobile-marketing-and-push/customer-io-vs-klaviyo/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| Customer.io | 19% | #2 of 14 | 0% | 23 | 11 of 14 |
| Klaviyo | 2% | #6 of 14 | 21% | 28 | 13 of 14 |

## The direct prompt, model by model

- Claude Haiku 4.5: customer.io first (first choices: Customer.io) (alternatives: ActiveCampaign, Courier, OneSignal, Pushwoosh, Vero)
- Gemini 3.5 Flash: customer.io first (first choices: Customer.io, Sakari) (alternatives: ActiveCampaign, OneSignal)
- Grok 4.1 Fast: customer.io first (first choices: Customer.io) (alternatives: Braze, OneSignal, Pushwoosh, Vero)
- Qwen 3.7 Flash: customer.io first (first choices: Customer.io) (alternatives: Braze, HubSpot Marketing Hub)
- GLM 4.7 FlashX: customer.io first (first choices: Customer.io) (alternatives: OneSignal)
- Muse Glimmer 30B: customer.io first (first choices: Customer.io) (alternatives: Braze, Iterable)
- DeepSeek V4 Flash: neither first, one named (first choices: OneSignal) (alternatives: Customer.io, Twilio Programmable Messaging)
- Llama 4 Maverick: neither first, one named (first choices: Pushwoosh) (alternatives: Attentive, Klaviyo)
- Kimi K2: neither first, one named (first choices: OneSignal) (alternatives: ActiveCampaign, Customer.io, Iterable)
- GPT-5.4 mini: neither named (first choices: Braze) (alternatives: Airship, Iterable, OneSignal)
- Perplexity Sonar: neither named (first choices: OneSignal) (alternatives: Attentive, CleverTap, Insider, MoEngage)
- Mistral Small: neither named (first choices: OneSignal, Pushwoosh) (alternatives: Insider)
- MiniMax M2.5: neither named (first choices: OneSignal) (alternatives: Braze, MoEngage, Salesforce Marketing Cloud, Twilio Programmable Messaging)
- GPT-6 Luna: neither named (first choices: Customer.io Journeys) (alternatives: Braze, OneSignal)

## What the models said about Customer.io

- "the industry consensus for a mid-market B2B company looking for a balance of features, ease of use, and cost-effectiveness is Customer.io" (GLM 4.7 FlashX, direct prompt, first choice)
- "the industry consensus for the best overall balance of power and usability for mid-market B2B (especially SaaS) is Customer.io" (Qwen 3.7 Flash, direct prompt, first choice)

## What the models said about Klaviyo

- "Attentive and Klaviyo are phenomenal for SMS, but they are built for Shopify/e-commerce. They struggle with B2B data models" (Gemini 3.5 Flash, direct prompt, hard negative)
- "E-commerce powerhouse (Shopify/others); SMS + email automation, personalization via data; high deliverability" (Grok 4.1 Fast, comparative prompt, first choice)

Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all fourteen models, for a mid-market B2B company; rank is within the category. Comparisons are drawn for the top eight products in each category. Published under CC BY 4.0; the output is the models' output, and nothing here is a recommendation by the index.