# Wave vs Xero: which do AI models recommend for invoicing software, September 2026

Finance AI Recommendation Index, September 2026 Edition, Invoicing software. Zero of twelve models named Wave first on the direct prompt; zero named Xero. Page: https://finance-ai-index.com/receivables/invoicing-software/wave-vs-xero/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| Wave | 19% | #1 of 10 | 23% | 35 | 12 of 12 |
| Xero | 2% | #6 of 10 | 0% | 26 | 12 of 12 |

## The direct prompt, model by model

- Grok 4.1 Fast: neither first, one named (first choices: BILL) (alternatives: Chargebee, NetSuite, QuickBooks, Xero)
- Claude Haiku 4.5: neither named (first choices: Sage Intacct) (alternatives: BILL, DealHub AI, Younium)
- GPT-5.4 mini: neither named (first choices: NetSuite SuiteBilling) (alternatives: BILL, Sage Intacct)
- Gemini 3.5 Flash: neither named (first choices: Versapay) (alternatives: BILL, Billtrust, Chargebee, Invoiced, Lago, Orb, Quadient AR)
- Perplexity Sonar: neither named (first choices: Invoiced) (alternatives: BILL, NetSuite, QuickBooks)
- Mistral Small: neither named (first choices: Invoiced, SAP) (alternatives: AvidXchange, BILL, Tipalti)
- DeepSeek V4 Flash: neither named (first choices: Billtrust, Invoiced) (alternatives: BILL, Chargebee, HighRadius, Quadient AR, Sage Intacct, Tipalti, Versapay)
- Llama 4 Maverick: neither named
- Qwen 3.7 Flash: neither named (first choices: Billforward) (alternatives: BILL, ChargeOver, NetSuite SuiteBilling, Vendormedia)
- Kimi K2: neither named (first choices: HighRadius) (alternatives: BILL, Billtrust, Invoiced, Versapay)
- GLM 4.7 FlashX: neither named (first choices: Invoiced) (alternatives: Chargebee, QuickBooks, Zoho Invoice)
- MiniMax M2.5: neither named (first choices: BILL) (alternatives: Stampli, Tipalti)

## What the models said about Wave

- "Invoicemonk says to avoid US/Canada-only tools like Wave if you need multi-currency/global compliance" (Perplexity Sonar, negative prompt, hard negative)
- "Avoid free tools like Wave—they lack automation depth growing businesses need" (Kimi K2, paraphrase prompt, hard negative)
- "Wave offers a permanently free version with no monthly subscription, and its invoicing features are intuitive to navigate" (Claude Haiku 4.5, budget prompt, first choice)

Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all twelve models, for a mid-market B2B company; rank is within the category. Comparisons are drawn for the top eight products in each category. Published under CC BY 4.0; the output is the models' output, and nothing here is a recommendation by the index.