# ADP TotalSource vs Paychex: which do AI models recommend for peos, October 2026

HR AI Recommendation Index, October 2026 Edition, PEO providers. Seven of fourteen models named ADP TotalSource first on the direct prompt; one named Paychex. Page: https://hr-ai-index.com/core/peo-providers/adp-totalsource-vs-paychex/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| ADP TotalSource | 22% | #2 of 9 | 15% | 46 | 14 of 14 |
| Paychex | 4% | #7 of 9 | 18% | 11 | 7 of 14 |

## The direct prompt, model by model

- GPT-5.4 mini: adp totalsource first (first choices: ADP TotalSource) (alternatives: Insperity, TriNet)
- Mistral Small: adp totalsource first (first choices: ADP TotalSource, Paychex PEO) (alternatives: Deel Hire)
- DeepSeek V4 Flash: adp totalsource first (first choices: ADP TotalSource, Rippling) (alternatives: Insperity, Justworks, TriNet)
- Kimi K2: adp totalsource first (first choices: ADP TotalSource, TriNet) (alternatives: Insperity, Justworks, Paychex PEO/Oasis)
- GLM 4.7 FlashX: adp totalsource first (first choices: ADP TotalSource) (alternatives: G&A Partners, Justworks, Paychex PEO, Rippling, TriNet)
- GPT-6 Luna: adp totalsource first (first choices: ADP TotalSource) (alternatives: Insperity, TriNet)
- Muse Glimmer 30B: adp totalsource first (first choices: ADP TotalSource) (alternatives: Engage PEO, Insperity, Paychex PEO, TriNet)
- Perplexity Sonar: paychex first (first choices: Insperity, Paychex) (alternatives: ADP TotalSource, Deel, Rippling)
- Gemini 3.5 Flash: neither first, one named (first choices: Rippling) (alternatives: ADP TotalSource, Insperity, TriNet)
- Grok 4.1 Fast: neither first, one named (first choices: Insperity) (alternatives: ADP TotalSource, Justworks, Paychex PEO, TriNet)
- Claude Haiku 4.5: neither named
- Llama 4 Maverick: neither named (first choices: Paychex PEO) (alternatives: Deel, Guideflow)
- Qwen 3.7 Flash: neither named (first choices: CoAdvantage) (alternatives: Deel, Paychex PEO, TriNet)
- MiniMax M2.5: neither named (first choices: Paychex PEO) (alternatives: CoAdvantage, Deel Hire)

## What the models said about ADP TotalSource

- "ADP TotalSource has a 3.1 Trustpilot score with numerous negative reviews about customer support, and many users claim they faced payroll accuracy issues" (Claude Haiku 4.5, negative prompt, soft negative)
- "Many legacy PEOs (like ADP TotalSource or CoAdvantage) run on rigid, older software platforms that do not integrate cleanly with modern tools." (Gemini 3.5 Flash, scale prompt, soft negative)
- "shows mixed reviews, with some customers reporting: Inconsistent service quality - High costs" (MiniMax M2.5, negative prompt, soft negative)
- "ADP TotalSource is the most frequently recommended first look because of its mid-market focus, Fortune 500 benefit access and structured HR outsourcing." (Muse Glimmer 30B, paraphrase prompt, first choice)
- "My top recommendation for most mid-market B2B companies: Start with ADP TotalSource if you're over 100 employees and value scalability" (DeepSeek V4 Flash, direct prompt, first choice)
- "Often ranked as the best overall PEO, ADP is praised for its robust payroll processing, extensive benefits, and strong compliance support." (Mistral Small, comparative prompt, first choice)

## What the models said about Paychex

- "A major drawback users mention with Paychex is issues with accurate time-tracking and payroll processing" (Claude Haiku 4.5, negative prompt, soft negative)
- "Best overall for midsize businesses: Paychex — multiple guides explicitly position it as a strong fit for midsize companies." (Perplexity Sonar, direct prompt, first choice)
- "SAFE BET: Stick to large, publicly traded PEOs (like Paychex, ADP TotalSource, Rippling)" (Qwen 3.7 Flash, negative prompt, first choice)
- "Paychex appears to be one of the more budget-friendly options for very small teams" (Perplexity Sonar, budget prompt, first choice)

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.