# Vertex O Series: how AI models rank it, November 2026

Gane Index, November 2026 Edition. Named in 2 judge labels across 2 categories by 2 of 14 models. Page: https://www.gane.ai/index/finance/vendors/vertex-o-series

## Standing by category

| Category | Share | Rank | Negative rate | Labels |
|---|---|---|---|---|
| [Corporate tax provision](https://www.gane.ai/index/finance/tax/corporate-tax-provision/index.md) | 0% | 57 | 0% | 1 |
| [Global e-invoicing compliance](https://www.gane.ai/index/finance/tax/global-e-invoicing-compliance/index.md) | 0% | 99 | 0% | 1 |

## What the models said for it

- "Vertex is the leading specialist in indirect tax automation and is described as "Best for large ERP systems and global sales tax."" (Muse Glimmer 30B, Global e-invoicing compl)
- "Vertex O Series and Avalara are the two top-rated tax compliance software products according to end-user feedback" (Claude Haiku 4.5, Corporate tax provision)

## By model

| Model | First choice | Alternative | Mention | Warning | Labels |
|---|---|---|---|---|---|
| Claude Haiku 4.5 | 0 | 1 | 0 | 0 | 1 |
| GPT-5.4 mini | 0 | 0 | 0 | 0 | 0 |
| Gemini 3.5 Flash | 0 | 0 | 0 | 0 | 0 |
| Perplexity Sonar | 0 | 0 | 0 | 0 | 0 |
| Grok 4.20 | 0 | 0 | 0 | 0 | 0 |
| Mistral Small | 0 | 0 | 0 | 0 | 0 |
| DeepSeek V4 Flash | 0 | 0 | 0 | 0 | 0 |
| Llama 4 Maverick | 0 | 0 | 0 | 0 | 0 |
| Qwen 3.7 Flash | 0 | 0 | 0 | 0 | 0 |
| Kimi K2 | 0 | 0 | 0 | 0 | 0 |
| GLM 4.7 FlashX | 0 | 0 | 0 | 0 | 0 |
| MiniMax M2.5 | 0 | 0 | 0 | 0 | 0 |
| GPT-6 Luna | 0 | 0 | 0 | 0 | 0 |
| Muse Glimmer 30B | 0 | 1 | 0 | 0 | 1 |

## Sources returned with these answers

The sites and pages cited by the answers that named Vertex O Series, from 4 of the 6 answers that named it (only the models that return a source list).

### Domains cited

- capterra.com: 2
- commenda.io: 2
- g2.com: 2
- omr.com: 2
- sourceforge.net: 2
- taxwire.com: 2
- techrepublic.com: 2
- articsledge.com: 1
- avalara.com: 1
- avask.com: 1

### Pages cited

- https://commenda.io/blog/best-vat-software-global-companies: 2
- https://g2.com/categories/sales-tax-and-vat-compliance: 2
- https://omr.com/en/reviews/category/sales-tax-and-vat-compliance: 2
- https://articsledge.com/post/tax-compliance-software: 1
- https://avalara.com/us/en/products/midsize.html: 1
- https://avalara.com/us/en/products/vat-returns-and-reporting.html: 1
- https://avalara.com/us/en/products/vat-solutions.html: 1
- https://avask.com/blog/best-vat-compliance-software: 1

## Record

- Method: https://www.gane.ai/index/finance/methodology
- License: CC BY 4.0. Cite as Gane Index, November 2026 Edition, www.gane.ai/index/finance.