# Thomson Reuters ONESOURCE Tax Provision vs Sovos Tax Provision: which do AI models recommend for corporate tax provision, October 2026

Finance AI Recommendation Index, October 2026 Edition, Corporate tax provision. Six of fourteen models named Thomson Reuters ONESOURCE Tax Provision first on the direct prompt; zero named Sovos Tax Provision. Page: https://finance-ai-index.com/tax/corporate-tax-provision/thomson-reuters-onesource-tax-provision-vs-sovos-tax-provision/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| Thomson Reuters ONESOURCE Tax Provision | 21% | #1 of 9 | 39% | 57 | 14 of 14 |
| Sovos Tax Provision | 2% | #6 of 9 | 0% | 16 | 9 of 14 |

## The direct prompt, model by model

- Perplexity Sonar: thomson reuters onesource tax provision first (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: Bloomberg Tax Provision, Longview Tax, Vertex Tax Accounting, Vertex Tax Provision)
- Grok 4.1 Fast: thomson reuters onesource tax provision first (first choices: Thomson Reuters ONESOURCE Tax Provision, Vertex Corporate Tax) (alternatives: Bloomberg Tax Provision, Sovos Tax Provision)
- Kimi K2: thomson reuters onesource tax provision first (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: Bloomberg Tax Provision, Vertex Tax Accounting)
- GLM 4.7 FlashX: thomson reuters onesource tax provision first (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: CCH Axcess Tax, Vertex Tax Accounting)
- GPT-6 Luna: thomson reuters onesource tax provision first (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: CSC Corptax)
- Muse Glimmer 30B: thomson reuters onesource tax provision first (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: Bloomberg Tax Provision, OneStream Tax Provision, Vertex Tax Accounting)
- Claude Haiku 4.5: neither first, one named (first choices: Bloomberg Tax Provision) (alternatives: Longview Tax, Thomson Reuters ONESOURCE Tax Provision)
- DeepSeek V4 Flash: neither first, one named (first choices: Bloomberg Tax Provision) (alternatives: TaxPoint, Thomson Reuters ONESOURCE Tax Provision, Vertex Tax Accounting)
- Qwen 3.7 Flash: neither first, one named (first choices: TaxSeries) (alternatives: Bloomberg Tax Provision, OneStream Tax Provision, Sovos Tax Provision)
- MiniMax M2.5: neither first, one named (first choices: Bloomberg Tax Provision, Vertex Tax Accounting) (alternatives: Oracle Tax Reporting, Thomson Reuters ONESOURCE Tax Provision)
- GPT-5.4 mini: neither named (first choices: Bloomberg Tax Provision, Longview Tax)
- Gemini 3.5 Flash: neither named (first choices: Bloomberg Tax Provision) (alternatives: Exactera Tax Provision, OneStream, Vena Solutions)
- Mistral Small: neither named (first choices: Bloomberg Tax Provision) (alternatives: Oracle Tax Reporting)
- Llama 4 Maverick: neither named

## What the models said about Thomson Reuters ONESOURCE Tax Provision

- "explicitly says to avoid or be cautious about Longview, ONESOURCE, Workiva, Oracle Tax Reporting, and Corptax" (Perplexity Sonar, negative prompt, hard negative)
- ""Avoid for now: OneSource, Corptax, Longview – these are enterprise-grade tools with enterprise-grade price tags."" (Muse Glimmer 30B, negative prompt, hard negative)
- "Avoid Bloomberg Tax Provision, Thomson Reuters ONESOURCE, and other enterprise\u2011grade provision platforms" (GLM 4.7 FlashX, budget prompt, hard negative)
- "Often tops lists for consolidated provisions... ONESOURCE in audit-proofing; Analyst reports like Gartner often rate ONESOURCE/Vertex highly for this segment." (Grok 4.1 Fast, direct prompt, first choice)
- "Thomson Reuters ONESOURCE Tax Provision is the most cited first choice in the mid-market set, and is the accepted enterprise standard" (Muse Glimmer 30B, paraphrase prompt, first choice)
- "1. ONESOURCE Tax Provision (by Thomson Reuters) ... Real-time capabilities and robust integration with other tax workflow tools." (Mistral Small, comparative prompt, first choice)

## What the models said about Sovos Tax Provision

- "the lowest cost provision-grade options are the smaller cloud provision platforms, e.g. Longview Tax Provision or Sovos Tax Provision" (Muse Glimmer 30B, budget prompt, first choice)
- "### 1. Sovos Tax Provision
- Best for: Global tax teams needing repeatable ASC 740 and IAS 12 provision-close workpapers" (Kimi K2, comparative prompt, first choice)
- "Sovos Tax Provision is considered the best overall" (Llama 4 Maverick, 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.