# BILL vs Wave: which do AI models recommend for invoicing software, October 2026

Finance AI Recommendation Index, October 2026 Edition, Invoicing software. Five of fourteen models named BILL first on the direct prompt; zero named Wave. Page: https://finance-ai-index.com/receivables/invoicing-software/bill-vs-wave/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| BILL | 16% | #2 of 12 | 4% | 25 | 13 of 14 |
| Wave | 14% | #4 of 12 | 27% | 37 | 14 of 14 |

## The direct prompt, model by model

- Claude Haiku 4.5: bill first (first choices: BILL) (alternatives: QuickBooks, Rillion, Sage Intacct)
- GPT-5.4 mini: bill first (first choices: BILL, Billtrust) (alternatives: NetSuite SuiteBilling)
- Mistral Small: bill first (first choices: BILL, Invoiced) (alternatives: QuickBooks, Zoho Invoice)
- Kimi K2: bill first (first choices: BILL) (alternatives: Chargebee, Invoiced, NetSuite SuiteBilling, Sage Intacct)
- MiniMax M2.5: bill first (first choices: BILL, HighRadius) (alternatives: Billtrust, Invoiced)
- Grok 4.1 Fast: neither first, one named (first choices: NetSuite SuiteBilling) (alternatives: BILL, Billtrust, QuickBooks, Xero)
- DeepSeek V4 Flash: neither first, one named (first choices: NetSuite SuiteBilling) (alternatives: BILL, Sage Intacct, Versapay, Xero)
- GLM 4.7 FlashX: neither first, one named (first choices: Invoiced) (alternatives: BILL, FreshBooks, QuickBooks, Xero)
- GPT-6 Luna: neither first, one named (first choices: Ordway) (alternatives: BILL, Centime, Stripe Billing)
- Muse Glimmer 30B: neither first, one named (first choices: Invoiced) (alternatives: BILL, NetSuite SuiteBilling, SAP, Versapay)
- Gemini 3.5 Flash: neither named (first choices: Versapay) (alternatives: Billtrust, Chargebee, Quadient AR, Stripe Billing, Upflow)
- Perplexity Sonar: neither named (first choices: NetSuite SuiteBilling) (alternatives: Billtrust, Invoiced)
- Llama 4 Maverick: neither named (first choices: NetSuite SuiteBilling) (alternatives: Billtrust, Invoiced)
- Qwen 3.7 Flash: neither named (first choices: Billtrust, Invoiced) (alternatives: Avalara, ChargeOver, NetSuite SuiteBilling)

## What the models said about BILL

- "BILL and Invoiced are the top recommendations due to their advanced automation, AI capabilities, and scalability." (Mistral Small, direct prompt, first choice)

## What the models said about Wave

- "Use with Extreme Caution: Wave (only for small, low-risk transactions; avoid for high-volume/high-value needs)" (Qwen 3.7 Flash, negative prompt, hard negative)
- "Payment holds \u2013 funds can be frozen with extensive documentation demands" (Kimi K2, negative prompt, hard negative)

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. 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.