# Thomson Reuters ONESOURCE vs Longview Tax: which do AI models recommend for corporate tax provision, September 2026

Finance AI Recommendation Index, September 2026 Edition, Corporate tax provision. Zero of twelve models named Thomson Reuters ONESOURCE first on the direct prompt; one named Longview Tax. Page: https://finance-ai-index.com/tax/corporate-tax-provision/thomson-reuters-onesource-vs-longview-tax/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| Thomson Reuters ONESOURCE | 10% | #3 of 9 | 16% | 19 | 9 of 12 |
| Longview Tax | 7% | #4 of 9 | 18% | 28 | 11 of 12 |

## The direct prompt, model by model

- Qwen 3.7 Flash: longview tax first (first choices: Longview Tax) (alternatives: Bloomberg Tax Provision, CSC Corptax, Thomson Reuters ONESOURCE)
- Claude Haiku 4.5: neither first, one named (alternatives: Bloomberg Tax Provision, CSC Corptax, Longview Tax, Thomson Reuters ONESOURCE)
- GPT-5.4 mini: neither first, one named (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: CCH Axcess/ProSystem fx tax provision offerings, Longview Tax, ONESOURCE Income Tax / Direct Tax Essential)
- Gemini 3.5 Flash: neither first, one named (first choices: Bloomberg Tax Provision) (alternatives: Exactera Tax Provision, Longview Tax, Thomson Reuters ONESOURCE Tax Provision, Vena Solutions)
- Kimi K2: neither first, one named (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: CCH Tagetik, FloQast Tax Provision, Longview Tax, Lucasys Tax Provision, Sovos Tax Provision)
- GLM 4.7 FlashX: neither first, one named (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: Bloomberg Tax Provision, Longview Tax, Sovos Tax Provision)
- Perplexity Sonar: neither named (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: CSC Corptax, Wolters Kluwer CCH Tagetik Tax Provision & Reporting)
- Grok 4.1 Fast: neither named (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: TaxPoint, Taxfyle, Vertex Tax Accounting)
- Mistral Small: neither named (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: Sovos Tax Provision, Vertex Tax Accounting)
- DeepSeek V4 Flash: neither named (first choices: Bloomberg Tax Provision, Thomson Reuters ONESOURCE Tax Provision) (alternatives: Sovos Tax Provision, Vertex Tax Accounting)
- Llama 4 Maverick: neither named (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: Avalara, CCH Axcess Tax, Taxfyle)
- MiniMax M2.5: neither named (first choices: Bloomberg Tax Provision, Thomson Reuters ONESOURCE Tax Provision) (alternatives: CCH Tagetik Tax Provision & Reporting, Taxfyle, Vertex Tax Accounting)

## What the models said about Thomson Reuters ONESOURCE

- "Enterprise Options to AVOID on a Limited Budget | Thomson Reuters ONESOURCE | $200K–$2M+/year" (Kimi K2, budget prompt, hard negative)
- "Avoid: Longview, ONESOURCE, Workiva, Oracle Tax Reporting, and Corptax." (DeepSeek V4 Flash, budget prompt, hard negative)
- "cannot justify the six-figure price tag of enterprise suites like Bloomberg or Thomson Reuters ONESOURCE" (Qwen 3.7 Flash, budget prompt, soft negative)
- "Choose Thomson Reuters ONESOURCE if you are a larger, audited mid-market C-Corp with multiple subsidiaries" (Gemini 3.5 Flash, paraphrase prompt, first choice)
- "I'd recommend Thomson Reuters ONESOURCE as the top choice for income tax compliance software" (Grok 4.1 Fast, paraphrase prompt, first choice)
- "Corporate income tax (direct tax) | Thomson Reuters ONESOURCE or Vertex" (GLM 4.7 FlashX, paraphrase prompt, first choice)

## What the models said about Longview Tax

- "Avoid: Longview, ONESOURCE, Workiva, Oracle Tax Reporting, and Corptax." (DeepSeek V4 Flash, budget prompt, hard negative)
- "Quote-based (typically high) | Enterprise CPM platform" (Kimi K2, budget prompt, hard negative)
- "Tier-1 enterprise software...routinely costs between $50,000 and $100,000+ annually" (Gemini 3.5 Flash, budget prompt, soft negative)
- "Longview Tax is generally considered the strongest "middle ground" solution to escape the spreadsheet trap without breaking the bank" (Qwen 3.7 Flash, budget prompt, first choice)
- "OneStream and Longview Tax are frequently recommended as they balance cost with essential features" (Mistral Small, budget prompt, first choice)
- "The Sweet Spot for Most Mid-Market Companies: Longview Tax" (Qwen 3.7 Flash, direct 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.