Klaviyo

Named in 39 judge labels across 4 categories by 6 of 6 models in the September 2026 Edition. 0 first choices, 9 negative labels. Every number here is derived from the raw labels under vendor table v2026-09-08.5.

Best standing

0% in Email marketing

Rank 10 of 36 products named in email marketing platforms, accepted challenger. 0 of 6 models made it the first choice on the direct prompt; 24% of its 17 labels there were negative.

Standing by category

Every category where a model named Klaviyo. Share is first choices across the direct, paraphrase, budget and scale prompts; rank is within every product named in that category.

Category	Vertical	First choices	Rank	Negative rate	Labels	Quadrant
Email marketing platforms conflict disclosed	Marketing	0%	10 of 36	24%	17	accepted challenger
Marketing automation and campaign management conflict disclosed	Marketing	0%	5 of 23	15%	13	accepted challenger
Customer data platforms	GTM data and infrastructure	0%	9 of 35	25%	8	under 10 labels
Data warehouse and reverse ETL for marketing	GTM data and infrastructure	0%	49 of 62	100%	1	under 10 labels

By model

How each model treated Klaviyo across every prompt where it was named. Six models, six prompts per category.

Model	First choice	Alternative	Mention	Negative	Labels
Claude Opus 5	2	1	3	5	11
Claude Opus 4.8	1	1	1	0	3
GPT-6 Astra	0	4	0	2	6
GPT-5.6 Sol	0	1	1	2	4
Gemini 3.1 Pro	0	7	3	0	10
Perplexity Sonar Pro	0	3	2	0	5

What the models said for it

Verbatim evidence the judge attached to positive labels.

“If you run an online store and want to tie emails directly to sales data, Klaviyo is usually the top recommendation” Claude Opus 4.8 · Email marketing · comparative prompt · first choice

“Klaviyo remains the default recommendation for eCommerce under one billion in GMV.” Claude Opus 5 · Marketing automation · comparative prompt · first choice

“The clear leader if you sell products online.” Claude Opus 5 · Email marketing · comparative prompt · first choice

“If you just want to set up marketing campaigns easily without code: Skip the traditional CDP and use Klaviyo or Customer.io.” Gemini 3.1 Pro · CDP · budget prompt · alternative

And against it

Verbatim evidence attached to negative labels. A warning on a product with few labels is a warning; on a product with many, it is one voice among them.

“Klaviyo to e-commerce retention. Wrong shape for B2B.” Claude Opus 5 · CDP · paraphrase prompt · hard negative

“skip Klaviyo and Braze for B2B” Claude Opus 5 · Email marketing · direct prompt · hard negative

“A traditional packaged CDP (Segment Personas, Klaviyo-style tools) is built around person-level event streams and will fight you.” Claude Opus 5 · Warehouse & ETL · direct prompt · soft negative

“Klaviyo has a similar dynamic, though it's often worth it for e-commerce: pricing increases quickly as your contact list grows” Claude Opus 5 · Email marketing · negative prompt · soft negative

Names read as Klaviyo

What the judge wrote, as written, with how often. The vendor table decides that these count as Klaviyo; a claim can dispute any of them.

Klaviyo/Bloomreach 1

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Claiming is free and changes nothing in the data. A claimed page gets a verified contact who is told when each edition publishes; the right to propose corrections to the vendor table, meaning names the judge wrote that should or should not read as Klaviyo, applied by version and listed in the change log; and a logo and one-line description supplied by the vendor and marked as such.

It does not get any change to labels, shares or quadrants, any preview, or any say over which quotes appear. Sponsorship is separate: a sponsor funds categories or buyer dimensions and is named on what it funded, and the rules are the same for every sponsor.