Every category where a model named Vertex for a mid-market B2B company. Share is first choices across the direct, paraphrase, budget and scale prompts; rank is within every product named in that category.

Category	Function	Share	Rank	Negative rate	Labels	Quadrant
Corporate tax provision	Tax and compliance	2%	17 of 98	40%	10	criticized challenger
Sales tax automation	Tax and compliance	0%	7 of 38	9%	35	accepted challenger
Global e-invoicing compliance	Tax and compliance	0%	23 of 108	17%	12	accepted challenger

Movement

This is the first edition on this tier, so no move can be computed for Vertex yet. From the next edition this section shows, per buyer segment, whether its share moved by more than the measured noise floor.

By model

How each model treated Vertex across every prompt where it was named for a mid-market B2B company. Twelve models, six prompts per category.

Model	First choice	Alternative	Mention	Negative	Labels
Claude Haiku 4.5	0	0	1	0	1
GPT-5.4 mini	0	5	1	2	8
Gemini 3.5 Flash	0	2	1	1	4
Perplexity Sonar	0	1	1	0	2
Grok 4.1 Fast	0	3	2	2	7
Mistral Small	0	2	2	0	4
DeepSeek V4 Flash	1	5	2	1	9
Llama 4 Maverick	0	0	2	0	2
Qwen 3.7 Flash	0	3	1	0	4
Kimi K2	0	2	2	2	6
GLM 4.7 FlashX	2	2	1	0	5
MiniMax M2.5	0	3	1	1	5

By framing

Which of the six questions produced the naming. By model says how often; this says asked what. The first-choice count on the right carries the marks of the models that produced it.

FramingLabels by classFirst choices

Direct38 labels5

Paraphrase46 labels15

Comparative41 labels6not counted in share

Budget-constrained23 labels5

Scale-constrained26 labels3

Negative18 labels3not counted in share

First choiceAlternativeMentionNegative192 labels in all, every segment counted; 28 of the 37 first choices count toward share, since the comparative and negative framings do not. The bar is one segment per label class, to scale within the framing.

What the models said for it

Verbatim evidence the judge attached to positive labels.

“Need global tax & e-invoicing compliance across many jurisdictions? → Sovos, Vertex, or Pagero” DeepSeek V4 Flash · Global e-invoicing compl · comparative prompt · first choice

“use reputable, integrated solutions (like Avalara, Vertex, TaxJar, or Anrok)” GLM 4.7 FlashX · Sales tax automation · negative prompt · first choice

“Corporate income tax (direct tax) | Thomson Reuters ONESOURCE or Vertex” GLM 4.7 FlashX · Corporate tax provision · paraphrase prompt · first choice

“Vertex is the preferred enterprise option ... Limitation: Highly complex, expensive, and overkill for a standard lower-to-mid-market company.” Gemini 3.5 Flash · Sales tax automation · direct 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.

“Enterprise-focused, indirect tax only (no provision)” Kimi K2 · Corporate tax provision · budget prompt · hard negative

“consider Vertex for indirect tax, but it is not the clearest provision-first choice from the sources I found” GPT-5.4 mini · Corporate tax provision · direct prompt · soft negative

“but those are generally more enterprise-oriented and not the best fit for a limited budget” GPT-5.4 mini · Global e-invoicing compl · budget prompt · soft negative

“Vertex is for large SAP/Oracle enterprises (usually overkill/costly for mid-market)” DeepSeek V4 Flash · Global e-invoicing compl · direct prompt · soft negative

Named alongside

The products named in the same answers as Vertex, over the 192 answers that named it. Took the first choice instead counts the answers where the other product was the first choice and Vertex was named but was not.

ProductSame answerTook the first choice insteadHead to head

Avalara AvaTax121 of 19240Not in the top three

Sovos94 of 1929Not in the top three

TaxJar77 of 19213Not in the top three

Thomson Reuters ONESOURCE54 of 1924Not in the top three

Anrok47 of 1924Not in the top three

TaxCloud34 of 1924Not in the top three

Avalara32 of 1927Not in the top three

Zamp28 of 1922Not in the top three

Stripe Tax26 of 1920Not in the top three

Pagero17 of 1923Not in the top three

A head-to-head page exists where both products are in a category's top three. The other rows are the same fact without a page behind them, so they link to the product instead.

What carried it into the answer

The sites and pages cited by the answers that named Vertex. A fact about retrieval, not a lever on the model.

Citations exist only for the models that return a source list, four of the twelve in this edition, so these counts come from 163 of the 192 answers that named Vertex and are not a share of its labels.

Domains cited

avalara.com78

taxcloud.com74

learn.g2.com72

guideflow.com68

worldmetrics.org65

zamp.com57

galvix.com51

taxwire.com50

g2.com47

techrepublic.com47

609 of the 609 domain citations in answers naming Vertex came from somebody else's page.

Pages cited

learn.g2.com/best-sales-tax-compliance-software72

taxwire.com/blog/best-sales-tax-compliance-software47

techrepublic.com/article/best-sales-tax-software44

taxcloud.com/blog/sales-tax-compliance-software43

galvix.com/article/best-sales-tax-software42

guideflow.com/blog/tax-compliance-software41

guideflow.com/blog/sales-tax-software38

guideflow.com/blog/sales-tax-automation-software32

Pages are listed as the models cited them.

Names read as Vertex

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

Vertex E-Invoicing 2Avalara/Vertex 1

Is this your product?

Claim this page

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

It does not get any change to labels, shares or verdicts, any preview, or any say over which quotes appear. A verification link goes to your work email; an address at vertexinc.com is approved on the spot, any other address is reviewed by hand.

Your name and company appear on the claimed page, or the company alone if you ask below. A title and a LinkedIn address appear there too if you give them, and are left off if you do not. Your email address is never published.