# Brex vs American Express Corporate Card: which do AI models recommend for corporate cards, September 2026

Finance AI Recommendation Index, September 2026 Edition, Corporate cards. Zero of twelve models named Brex first on the direct prompt; zero named American Express Corporate Card. Page: https://finance-ai-index.com/spend/corporate-cards/brex-vs-american-express-corporate-card/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| Brex | 5% | #3 of 9 | 21% | 43 | 12 of 12 |
| American Express Corporate Card | 2% | #6 of 9 | 13% | 15 | 9 of 12 |

## The direct prompt, model by model

- Claude Haiku 4.5: neither first, one named (first choices: Ramp) (alternatives: Airbase, American Express Corporate Card, Paylocity for Finance, Spendesk)
- GPT-5.4 mini: neither first, one named (first choices: Ramp) (alternatives: Airwallex, American Express Corporate Card, BILL Spend & Expense)
- Gemini 3.5 Flash: neither first, one named (first choices: Ramp) (alternatives: Airbase, Brex, Corpay)
- Grok 4.1 Fast: neither first, one named (first choices: Ramp) (alternatives: BILL Spend & Expense, Brex)
- Qwen 3.7 Flash: neither first, one named (first choices: Ramp) (alternatives: Airbase, Brex)
- Kimi K2: neither first, one named (first choices: Ramp) (alternatives: Airbase, Brex, Corpay)
- GLM 4.7 FlashX: neither first, one named (first choices: Ramp) (alternatives: Airbase, Brex, Navan, U.S. Bank Commercial Rewards Card)
- MiniMax M2.5: neither first, one named (first choices: Airbase, Corpay) (alternatives: BILL Spend & Expense, Brex, Ramp)
- Perplexity Sonar: neither named (first choices: Ramp) (alternatives: Airbase, Corpay)
- Mistral Small: neither named (first choices: Airbase, Ramp) (alternatives: Spendesk and Paylocity for Finance, U.S. Bank Commercial Rewards Card)
- DeepSeek V4 Flash: neither named (first choices: Ramp) (alternatives: Airbase, BILL Spend & Expense)
- Llama 4 Maverick: neither named (first choices: Ramp) (alternatives: Airbase, U.S. Bank Commercial Rewards Card)

## What the models said about Brex

- "it is not recommended for limited-budget companies unless you are venture-backed" (Gemini 3.5 Flash, budget prompt, hard negative)
- "Brex requires businesses to hold at least $400,000 in monthly revenue for mid-market underwriting. This shuts out many bootstrapped or lower-revenue businesses." (DeepSeek V4 Flash, direct prompt, soft negative)
- "the platform may see shifts in product direction and pricing, which is something to keep in mind if you are looking for long-term platform stability" (Gemini 3.5 Flash, paraphrase prompt, soft negative)
- "Brex (Best for High-Velocity Startups) ... high credit lines, virtual cards for security, and excellent employee management" (Qwen 3.7 Flash, comparative prompt, first choice)

## What the models said about American Express Corporate Card

- "Programs/Issuers with Frequent Red Flags:
- American Express Corporate Cards: Low BBB rating (1.08/5 from 500+ reviews)" (Grok 4.1 Fast, negative prompt, hard negative)
- "Amex excels in premium travel rewards but lags in automation (manual reports common)" (Grok 4.1 Fast, comparative prompt, soft negative)
- "Choose Amex Corporate if you want premium travel benefits, strong program structure" (GPT-5.4 mini, comparative prompt, first choice)
- "my default recommendation would be American Express Corporate Cards" (GPT-5.4 mini, paraphrase prompt, first choice)
- "usually best if you value premium travel perks ... but it tends to fit larger companies and comes with higher fees" (GPT-5.4 mini, direct prompt, alternative)

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.