# Mercury vs Rho: which do AI models recommend for business banking, September 2026

Finance AI Recommendation Index, September 2026 Edition, Business banking. One of twelve models named Mercury first on the direct prompt; two named Rho. Page: https://finance-ai-index.com/treasury/business-banking/mercury-vs-rho/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| Mercury | 20% | #1 of 13 | 7% | 43 | 12 of 12 |
| Rho | 12% | #4 of 13 | 0% | 12 | 9 of 12 |

## The direct prompt, model by model

- Kimi K2: mercury first (first choices: Chase Business Banking, Mercury) (alternatives: Brex, First Internet Bank)
- Gemini 3.5 Flash: rho first (first choices: Rho) (alternatives: Bank of America, Brex, Chase Business Banking, Fifth Third Bank, Mercury, PNC Bank)
- Perplexity Sonar: rho first (first choices: Rho) (alternatives: Bluevine, Brex, Relay)
- Grok 4.1 Fast: neither first, one named (first choices: Bank of America, Chase Business Banking) (alternatives: Brex, PNC Bank, Rho)
- DeepSeek V4 Flash: neither first, one named (first choices: Brex) (alternatives: Bank of America, Chase Business Banking, HSBC, Mercury, Relay, U.S. Bank, Wells Fargo)
- MiniMax M2.5: neither first, one named (first choices: Chase Business Banking) (alternatives: Airwallex, Bank of America, Barclays, HSBC, Mercury, NatWest, Rho, Silicon Valley Bank, Wells Fargo)
- Claude Haiku 4.5: neither named (first choices: Brex) (alternatives: Airwallex, Chase Business Banking, U.S. Bank)
- GPT-5.4 mini: neither named (first choices: Chase Business Banking) (alternatives: Bank of America, TD Bank, U.S. Bank)
- Mistral Small: neither named (first choices: Axos Bank, PNC Bank) (alternatives: First Internet Bank, Revolut Business, Wise Business)
- Llama 4 Maverick: neither named
- Qwen 3.7 Flash: neither named (first choices: Bluevine) (alternatives: Airwallex, Chase Business Banking, Relay)
- GLM 4.7 FlashX: neither named (first choices: Chase Business Banking) (alternatives: Airwallex, Qonto, Wise Business)

## What the models said about Mercury

- "Frequent account freezes/closure, slow support, funds held 60+ days | 15.4 negative reviews/month (4x industry average)" (DeepSeek V4 Flash, negative prompt, hard negative)
- "neobanks (such as Mercury, Bluevine, or Novo) rely heavily on automated fraud-detection algorithms" (Gemini 3.5 Flash, negative prompt, soft negative)
- "does not support physical branches or cash deposits" (Perplexity Sonar, budget prompt, soft negative)
- "I'd usually recommend Mercury if your priority is a modern, startup-friendly banking platform" (GPT-5.4 mini, paraphrase prompt, first choice)
- "For most mid-market B2B companies today, Mercury or Chase are the safest starting points" (Kimi K2, direct prompt, first choice)
- "Mercury, which is considered the best overall digital business banking platform for startups" (Llama 4 Maverick, paraphrase prompt, first choice)

## What the models said about Rho

- "I'd recommend Rho if your priority is an all-in-one platform for banking, cards, bill pay, and spend controls as you scale." (Perplexity Sonar, paraphrase prompt, first choice)
- "For a mid-sized B2B startup, I'd recommend Rho as your primary banking platform" (DeepSeek V4 Flash, paraphrase 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.