Customer.io vs Klaviyo
Six of fourteen models named Customer.io first on the direct prompt; zero named Klaviyo. Customer.io was named by eleven of the fourteen models and Klaviyo by thirteen and Customer.io carries 23 labels and Klaviyo 28, so the shares are not directly comparable.
Named in ten categories this edition.
Boston, United States, founded 2012. Named in thirteen categories this edition.
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; every quote names the model and the prompt it came from. Both figures come from the mobile marketing and push page.
By framing
Customer.ioFirst choices, of fourteen modelsKlaviyo
Every model, every framing
| Model | Direct | Paraphrase | Comparative | Budget-constrained | Scale-constrained | Negative |
|---|---|---|---|---|---|---|
| Claude Haiku 4.5 | | | | |||
| GPT-5.4 mini | | |||||
| Gemini 3.5 Flash | | | | | | |
| Perplexity Sonar | ||||||
| Grok 4.1 Fast | | | | | | |
| Mistral Small | | | ||||
| DeepSeek V4 Flash | | | | | ||
| Llama 4 Maverick | | | ||||
| Qwen 3.7 Flash | | | ||||
| Kimi K2 | | | | |||
| GLM 4.7 FlashX | | | | |||
| MiniMax M2.5 | ||||||
| GPT-6 Luna | | | | |||
| Muse Glimmer 30B | | | |
Customer.io Klaviyo first choice named as an alternative argued againstblank: not namedEach cell is one answer, Customer.io on the left and Klaviyo on the right.The direct prompt
Customer.io first, Klaviyo not the choice
6 of 14 modelsKlaviyo was named in the answer but not as the choice, or not at all.Neither was the first choice, one was named
3 of 14 modelsThe answer put something else first and named one of the two as an alternative.Neither was named
5 of 14 modelsThe answer made no first choice from these two in this category.Bold names in an answer are the products the judge labeled a first choice; a model naming several gives each of them that label. The full answer text for every row is in the record.
By buyer segment
Customer.io4%#4 of 18Klaviyo2%#7 of 18Customer.io19%#2 of 14Klaviyo2%#6 of 14Customer.io3%#– of 12Klaviyo0%#12 of 12What the models said about Customer.io
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Two of two in this category shown.
“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
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Two of two in this category shown.
“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
Comparisons are drawn for the top eight products in each category, each against each. The output is the models' output; nothing here is a recommendation by the index.