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

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

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| Justworks | 24% | #1 of 9 | 8% | 38 | 13 of 14 |
| ADP TotalSource | 22% | #2 of 9 | 15% | 46 | 14 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)
- Gemini 3.5 Flash: neither first, one named (first choices: Rippling) (alternatives: ADP TotalSource, Insperity, TriNet)
- Perplexity Sonar: neither first, one named (first choices: Insperity, Paychex) (alternatives: ADP TotalSource, Deel, Rippling)
- 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 Justworks

- "though it may be a better fit for smaller or less complex teams than a traditional mid-market operation" (Perplexity Sonar, direct prompt, soft negative)
- "While big names (like TriNet, JustWorks, ADP) get complaints due to their size" (Qwen 3.7 Flash, negative prompt, soft negative)
- "Justworks is usually the best first PEO to look at because it's widely cited as a low-friction option with transparent per-employee pricing" (GPT-5.4 mini, budget prompt, first choice)
- "For pure budget (under $100/employee) + full PEO: Start with Justworks Basic. It's frequently ranked #1 for small businesses" (Grok 4.1 Fast, budget prompt, first choice)
- "Justworks and the provider highlighted by EORHQ (at $59/employee/month) are the top choices due to their affordability" (Mistral Small, budget prompt, first choice)

## 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)

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.