# Nextiva vs Microsoft Teams Phone: which do AI models recommend for business phones, October 2026

IT AI Recommendation Index, October 2026 Edition, Business phone systems. Five of fourteen models named Nextiva first on the direct prompt; zero named Microsoft Teams Phone. Page: https://it-ai-index.com/operations/business-phone-systems/nextiva-vs-microsoft-teams-phone/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| Nextiva | 14% | #3 of 12 | 6% | 49 | 14 of 14 |
| Microsoft Teams Phone | 3% | #7 of 12 | 10% | 21 | 13 of 14 |

## The direct prompt, model by model

- Grok 4.1 Fast: nextiva first (first choices: Nextiva) (alternatives: 8x8, Ooma Office, RingCentral, Zoom Phone)
- Llama 4 Maverick: nextiva first (first choices: Nextiva) (alternatives: JustCall, Vonage, Zoom Phone)
- GLM 4.7 FlashX: nextiva first (first choices: Nextiva, RingCentral RingEX) (alternatives: Dialpad Connect, GoTo Connect, Zoom Phone)
- MiniMax M2.5: nextiva first (first choices: Nextiva, RingCentral RingEX) (alternatives: Intermedia Unite, Zoom Phone)
- Muse Glimmer 30B: nextiva first (first choices: Nextiva, RingCentral) (alternatives: 8x8, Dialpad, Zoom Phone)
- Claude Haiku 4.5: neither first, one named (first choices: RingCentral) (alternatives: 8x8, Dialpad, Nextiva)
- GPT-5.4 mini: neither first, one named (first choices: RingCentral, Zoom Phone) (alternatives: Dialpad, Nextiva, Webex Calling)
- Gemini 3.5 Flash: neither first, one named (first choices: Dialpad, RingCentral) (alternatives: Aircall, Microsoft Teams Phone, Nextiva)
- Perplexity Sonar: neither first, one named (first choices: RingCentral) (alternatives: 8x8, Dialpad, JustCall, Nextiva)
- Mistral Small: neither first, one named (first choices: RingCentral) (alternatives: 8x8, Intermedia, Nextiva, Zoom Phone)
- DeepSeek V4 Flash: neither first, one named (first choices: RingCentral) (alternatives: 8x8, Aircall, Dialpad, Nextiva)
- Qwen 3.7 Flash: neither first, one named (first choices: RingCentral) (alternatives: Microsoft Teams Phone, Nextiva, Zoom Phone)
- Kimi K2: neither first, one named (first choices: 8x8, RingCentral RingEX) (alternatives: Dialpad, GoTo Connect, Nextiva)
- GPT-6 Luna: neither named (first choices: RingCentral RingEX) (alternatives: Dialpad, Teams Phone, Zoom Phone)

## What the models said about Nextiva

- "Billing disputes are common—users report being charged for add-ons they never approved." (DeepSeek V4 Flash, negative prompt, soft negative)
- "notorious for aggressive and highly restrictive sales contracts" (Gemini 3.5 Flash, negative prompt, soft negative)
- "Good all-in-one, but fewer integrations than RingCentral" (DeepSeek V4 Flash, scale prompt, soft negative)
- "The best business phone system for a mid-market B2B company is likely to be Nextiva, which is considered the best for unified communications at mid-market scale." (Llama 4 Maverick, direct prompt, first choice)
- "Start with Nextiva if prioritizing ease, reliability, and B2B essentials... it's frequently rated highest for mid-sized businesses" (Grok 4.1 Fast, direct prompt, first choice)
- "Prioritize highly rated alternatives: Nextiva (4.6-4.8/5 across platforms, A+ BBB), Ooma, or 8x8 for reliability and support." (Grok 4.1 Fast, negative prompt, first choice)

## What the models said about Microsoft Teams Phone

- "Limitation: Poor fax capabilities—avoid if you need to send/receive faxes" (Kimi K2, negative prompt, hard negative)
- "The configuration complexity of platforms like Microsoft Teams Phone or RingCentral can be significant overhead for a 15-person professional services firm" (Claude Haiku 4.5, negative prompt, soft negative)
- "The Best All-Around Choice: Microsoft Teams ... Teams is almost invariably the correct choice." (Qwen 3.7 Flash, paraphrase prompt, first choice)
- "The default choice if you are deeply embedded in the Microsoft 365 ecosystem." (Gemini 3.5 Flash, scale prompt, first choice)
- "if your company is already committed to the Microsoft ecosystem, Microsoft Teams is a natural fit and more cost-effective" (Claude Haiku 4.5, paraphrase prompt, alternative)

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.