Business banking · November 2026 Edition
Brex vs American Express Business Checking
Two of fourteen models named Brex first on the direct prompt; zero named American Express Business Checking. Brex was named by eleven of the fourteen models and American Express Business Checking by eleven and Brex carries 24 labels and American Express Business Checking 16, so the shares are not directly comparable.
Named in twelve categories this edition.
Named in one category this edition.
First-choice share8%2%Of first choices across the direct, paraphrase, budget and scale prompts, 0 to 100.
Negative rate17%6%Negative labels as a share of the product's labels, 0 to 100.
Rank in category#3#6A position in a field of 16; printed, not drawn.
Labels2416A count; the two differ.
The two percentage rows are drawn on one 0 to 100 track, Brex reading right to left. Rank and label count are printed, not drawn.Mercury vs Brex · Mercury vs American Express Business Checking · Bluevine vs Brex
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; every quote names the model and the prompt it came from. Both figures come from the business banking page.
By framing
How many of the fourteen models made each the first choice, per way of asking, and how many argued against it.
BrexFirst choices, of fourteen modelsAmerican Express Business Checking
Direct20
Paraphrase20
Comparative00
Budget-constrained01
Scale-constrained00
Negative004 against Brex · 1 against American Express Business Checking
Bars are first choices, 0 to 14 each sideModels that argued againstA model can name both, so the two sides of a row do not sum to fourteen.
Every model, every framing
The eighty-four answers behind the chart above, one cell each: where Brex and American Express Business Checking stood in it.
| Model | Direct | Paraphrase | Comparative | Budget-constrained | Scale-constrained | Negative |
|---|---|---|---|---|---|---|
| Claude Haiku 4.5 | | | | |||
| GPT-5.4 mini | | | ||||
| Gemini 3.5 Flash | | | | |||
| Perplexity Sonar | | | | | ||
| Grok 4.20 | | | | | ||
| Mistral Small | | |||||
| DeepSeek V4 Flash | | | | |||
| Llama 4 Maverick | | | ||||
| Qwen 3.7 Flash | | | ||||
| Kimi K2 | | | ||||
| GLM 4.7 FlashX | ||||||
| MiniMax M2.5 | | | ||||
| GPT-6 Luna | | |||||
| Muse Glimmer 30B | | | | |
Brex American Express Business Checking first choice named as an alternative argued againstblank: not namedEach cell is one answer, Brex on the left and American Express Business Checking on the right.The direct prompt
The plain question, one answer per model, grouped by where Brex and American Express Business Checking stood in it.
Brex first, American Express Business Checking not the choice
2 of 14 modelsAmerican Express Business Checking was named in the answer but not as the choice, or not at all.Claude Haiku 4.5Brex alternatives: Chase Business Banking, Mercury, Relay
Kimi K2Brex alternatives: Bank of America, First Internet Bank, Mercury
Neither was the first choice, one was named
5 of 14 modelsThe answer put something else first and named one of the two as an alternative.Gemini 3.5 FlashJPMorgan Chase – Middle Market Banking & Specialized Industries alternatives: Bank of America Global Commercial Banking, Brex, PNC Bank – Treasury Management, Ramp, Silicon Valley Bank, Wells Fargo – Commercial Banking
Perplexity SonarChase Commercial Banking alternatives: Airwallex, Bank of America, Brex, Mercury, Ramp, Rho, U.S. Bank
Grok 4.20Bank of America alternatives: Bluevine, Brex, Chase Business Banking, Citibank, Mercury, PNC Bank, Texas Capital Bank
MiniMax M2.5Chase Performance Business Checking alternatives: American Express Business Checking, Mercury, PNC Bank, TD Business Premier Checking
Muse Glimmer 30BPNC Bank alternatives: Bank of America, Brex, First Internet Bank
Neither was named
7 of 14 modelsThe answer made no first choice from these two in this category.GPT-5.4 miniJ.P. Morgan Commercial Banking alternatives: Bank of America
Mistral SmallPNC Bank, TD Business Premier Checking alternatives: Axos Bank Basic Business Checking, Capital One Business Savings & Checking, Chase Business Banking
DeepSeek V4 FlashChase Performance Business Checking alternatives: Capital One Enhanced Checking, KeyBank Business Reward Checking, Mercury, PNC Bank, Rho
Llama 4 Maverickno first choice
Qwen 3.7 FlashCamber, Mercury alternatives: Bank of America Business Advantage Fundamentals, Signature Bank, TD Bank Business Checking, Umpqua Bank
GLM 4.7 FlashXBank of America - Business Advantage 360, PNC Bank - Treasury Enterprise Plan alternatives: Chase - Performance Business Checking, First Internet Bank - Commercial Analyzed Checking, Frost Business Checking Plus
GPT-6 LunaJ.P. Morgan Commercial Banking alternatives: Bank of America, Citibank
Bold names in an answer are the products the judge labeled a first choice; a model naming several gives each of them that label. The full answer text for every row is in the record.
By buyer segment
The same question asked on behalf of a different buyer. Each standing is computed within its segment and they are never added together. The figures above are the mid-market standing, which is the one the category orders by.
Small business
American Express Business Checking leads by four points.
American Express Business Checking6%#5 of 14Brex2%#8 of 14Mid-marketThe figures above
The order flips: Brex leads at mid-market.
Brex8%#3 of 16American Express Business Checking2%#6 of 16Enterprise
Brex leads by twenty-seven points.
Brex27%#1 of 13American Express Business Checking0%#– of 13What the models said about Brex
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Two of two in this category shown.
“Primary recommendation: Brex – if you want an all-in-one financial platform with modern tools, high yields, and integrated spend management” Kimi K2 · direct prompt · first choice
“Best if you run a venture-backed startup or mid-market company and want a corporate card plus treasury and vault services in one platform.” Claude Haiku 4.5 · direct prompt · first choice
What the models said about American Express Business Checking
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Four of five in this category shown.
“American Express: It has received two enforcement orders in October 2026.” Llama 4 Maverick · negative prompt · hard negative
“The best business bank account for a company with a limited budget is Amex Business Checking” Llama 4 Maverick · budget prompt · first choice
“good for those looking to get a simple low-cost business checking account and do most of their business online” Claude Haiku 4.5 · budget prompt · alternative
“Choose American Express for straightforward online checking plus customer support and interest.” Perplexity Sonar · comparative prompt · alternative
Also compared
Mercury vs BrexMercury vs American Express Business CheckingBluevine vs BrexBluevine vs American Express Business CheckingBrex vs RhoBrex vs PNC BankBrex vs Axos Bank Basic Business CheckingBrex vs Bank of AmericaRho vs American Express Business CheckingPNC Bank vs American Express Business CheckingAmerican Express Business Checking vs Axos Bank Basic Business CheckingAmerican Express Business Checking vs Bank of AmericaAll twenty-eight head-to-head pages and the full business banking standing
Comparisons are drawn for the top eight products in each category, each against each. The output is the models' output; nothing here is a recommendation by the index.