# BILL Spend & Expense vs Brex: which do AI models recommend for expense management, October 2026

Finance AI Recommendation Index, October 2026 Edition, Expense management. Zero of fourteen models named BILL Spend & Expense first on the direct prompt; one named Brex. Page: https://finance-ai-index.com/spend/expense-management/bill-spend-expense-vs-brex/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| BILL Spend & Expense | 6% | #4 of 11 | 11% | 46 | 14 of 14 |
| Brex | 4% | #5 of 11 | 12% | 34 | 14 of 14 |

## The direct prompt, model by model

- Qwen 3.7 Flash: brex first (first choices: Brex, Ramp) (alternatives: BILL Spend & Expense, Expensify, Rydoo)
- Claude Haiku 4.5: neither first, one named (first choices: Ramp, Spendesk) (alternatives: Airbase, BILL Spend & Expense, Brex, Navan)
- GPT-5.4 mini: neither first, one named (first choices: Rippling Spend) (alternatives: Brex, Navan, Payhawk, Ramp, SAP Concur)
- Gemini 3.5 Flash: neither first, one named (first choices: Ramp) (alternatives: Airbase, Brex, Navan, Rippling Spend)
- Perplexity Sonar: neither first, one named (first choices: Payhawk) (alternatives: BILL Spend & Expense, Expensify, Procurify, SAP Concur)
- Mistral Small: neither first, one named (first choices: Airbase) (alternatives: BILL Spend & Expense, Eco, Ramp)
- DeepSeek V4 Flash: neither first, one named (first choices: Airbase, Ramp) (alternatives: Brex, Payhawk)
- Kimi K2: neither first, one named (first choices: Expensify, Ramp) (alternatives: Brex, Emburse)
- MiniMax M2.5: neither first, one named (first choices: Expensify, Rippling Spend, SAP Concur) (alternatives: Airwallex, BILL Spend & Expense, Navan, Paylocity, Ramp)
- GPT-6 Luna: neither first, one named (first choices: Ramp) (alternatives: Brex, Navan, SAP Concur)
- Grok 4.1 Fast: neither named (first choices: Navan) (alternatives: Expensify, Rippling Spend)
- Llama 4 Maverick: neither named
- GLM 4.7 FlashX: neither named (first choices: Airbase, Ramp) (alternatives: Expensify, Rippling Spend, SAP Concur, Zoho Expense)
- Muse Glimmer 30B: neither named (first choices: Navan, SAP Concur) (alternatives: Airbase, Paylocity, Rippling Spend, Rydoo)

## What the models said about BILL Spend & Expense

- "BILL/Divvy (bugs and support)" (DeepSeek V4 Flash, negative prompt, hard negative)

## What the models said about Brex

- "Brex (Avoid if you are a bootstrapped or traditional small business)" (Gemini 3.5 Flash, 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.