Customer.io vs Respond.io
Seven of fourteen models named Customer.io first on the direct prompt; zero named Respond.io. Customer.io was named by eleven of the fourteen models and Respond.io by twelve and Customer.io carries 14 labels and Respond.io 18, so the shares are not directly comparable.
Named in twelve categories this edition.
Named in three 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 SMS and WhatsApp marketing platforms page.
By framing
Customer.ioFirst choices, of fourteen modelsRespond.io
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 4.20 | | | ||||
| 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 Respond.io first choice named as an alternative argued againstblank: not namedEach cell is one answer, Customer.io on the left and Respond.io on the right.The direct prompt
Customer.io first, Respond.io not the choice
7 of 14 modelsRespond.io was named in the answer but not as the choice, or not at all.Neither was the first choice, one was named
2 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
Respond.io2%#12 of 17Customer.io0%#– of 17Customer.io19%#1 of 20Respond.io5%#6 of 20Customer.io0%#– of 14Respond.io0%#– of 14What 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 consensus for mid-market B2B SMS is Customer.io... with Customer.io as the best-in-class upgrade for SMS-centric, event-driven B2B programs.” Muse Glimmer 30B · paraphrase prompt · first choice
“For SMS: Customer.io is the top pick for mid-sized B2B companies due to its scalability, automation, and developer-friendly approach.” Mistral Small · paraphrase prompt · first choice
What the models said about Respond.io
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Three of four in this category shown.
“### 1. Respond.io ... Best For: Conversational B2B sales, lead qualification, and team collaboration.” Gemini 3.5 Flash · paraphrase prompt · first choice
“For WhatsApp: folk CRM or Respond.io are excellent” Mistral Small · paraphrase prompt · first choice
“Ratings: Highly recommended for scalability.” Grok 4.20 · 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.