# AI voice agents for enterprise buyers: what AI models recommend, November 2026

Gane Index, November 2026 Edition. Asked as "AI voice agent platform" and as "AI phone agent that answers customer calls", six framings each, to fourteen models with search on, on behalf of an enterprise B2B company. Added to the November 2026 Edition. Page: https://www.gane.ai/index/gtm/customer/ai-voice-agents/2026-11/enterprise

**Standing:** Synthflow leads with 19% of first choices; verdict contested. 54 first choices across the direct, paraphrase, budget and scale prompts.

## First-choice share

| Rank | Product | Share | Negative rate | Labels |
|---|---|---|---|---|
| 1 | [Synthflow](https://www.gane.ai/index/gtm/vendors/synthflow/index.md) | 19% | 21% | 38 |
| 2 | [PolyAI](https://www.gane.ai/index/gtm/vendors/polyai/index.md) | 13% | 10% | 29 |
| 3 | [Retell AI](https://www.gane.ai/index/gtm/vendors/retell-ai/index.md) | 13% | 28% | 50 |
| 4 | [NiCE Cognigy](https://www.gane.ai/index/gtm/vendors/nice-cognigy/index.md) | 11% | 0% | 14 |
| 5 | [Kore.ai](https://www.gane.ai/index/gtm/vendors/kore-ai/index.md) | 7% | 5% | 22 |
| 6 | [Bland AI](https://www.gane.ai/index/gtm/vendors/bland-ai/index.md) | 7% | 29% | 31 |
| 7 | [Cognigy](https://www.gane.ai/index/gtm/vendors/cognigy/index.md) | 4% | 5% | 20 |
| 8 | [Vapi](https://www.gane.ai/index/gtm/vendors/vapi/index.md) | 4% | 39% | 41 |
| 9 | [Rasa Voice](https://www.gane.ai/index/gtm/vendors/rasa-voice/index.md) | 2% | 0% | 11 |
| 21 | [Sierra](https://www.gane.ai/index/gtm/vendors/sierra/index.md) | 0% | 8% | 13 |
| 22 | [Genesys Cloud CX](https://www.gane.ai/index/gtm/vendors/genesys-cloud-cx/index.md) | 0% | 17% | 12 |
| 27 | [NICE CXone](https://www.gane.ai/index/gtm/vendors/nice-cxone/index.md) | 0% | 25% | 12 |

Rank is by share of first choices among all 111 products named; products with the same share are tied, and the order among them carries no meaning. The table lists those with at least 10 labels.

## Each model's first choice on the direct prompt

- Claude Haiku 4.5: Rasa Voice; alternatives Bland AI, Cognigy, PolyAI, Retell AI
- GPT-5.4 mini: OpenAI; alternatives Google Gemini, Twilio Voice AI
- Gemini 3.5 Flash: Retell AI, Vapi; alternatives Bland AI, Decagon, PolyAI, Sierra
- Perplexity Sonar: Kore.ai; alternatives NiCE Cognigy, PolyAI, Synthflow
- Grok 4.20: Kore.ai; alternatives Cognigy, Retell AI, Salesforce Agentforce Voice
- Mistral Small: ElevenLabs, Voiceflow; alternatives Botphonic, Cartesia Managed Agents, Retell AI
- DeepSeek V4 Flash: NiCE Cognigy, PolyAI; alternatives Atria, Kore.ai, Retell AI, Thoughtly
- Llama 4 Maverick: Synthflow; alternatives Bland AI, Kore.ai, Retell AI
- Qwen 3.7 Flash: Synthflow, Vapi; alternatives Genesys Cloud CX, Kore.ai, NICE CXone, Sierra
- Kimi K2: Cognigy, Kore.ai; alternatives Amazon Lex, Harmony.ai, Thoughtly
- GLM 4.7 FlashX: CloudTalk, Fini AI; alternatives Genesys Cloud CX, NICE CXone, Retell AI
- MiniMax M2.5: Synthflow; alternatives Chatbase, Fini AI, Retell AI, Vapi
- GPT-6 Luna: NiCE Cognigy; alternatives PolyAI, Vapi
- Muse Glimmer 30B: Retell AI; alternatives Bland AI, Cognigy, NICE CXone, Rasa Voice

## Sources the answers cite

75 of 84 answers came back with a source list, from 14 of 14 models. Sites named in the most answers:

- synthflow.ai: 39 answers, 75 citations
- retellai.com: 30 answers, 46 citations
- kore.ai: 25 answers, 29 citations
- thoughtly.com: 17 answers, 19 citations
- bland.ai: 16 answers, 28 citations
- botphonic.ai: 16 answers, 16 citations
- getvoip.com: 16 answers, 16 citations
- rasa.com: 15 answers, 17 citations

Pages named in the most answers:

- https://synthflow.ai/blog/best-10-ai-voice-agents-for-contact-centers-and-enterprises-tested-and-reviewed (33 answers)
- https://kore.ai/blog/best-voice-ai-agent-platforms-compared-and-reviewed (23 answers)
- https://botphonic.ai/ (16 answers)
- https://monday.com/blog/ai-agents/ai-voice-agents (14 answers)
- https://cartesia.ai/learn/ai-voice-agent-platforms (13 answers)
- https://getvoip.com/blog/ai-voice-assistants-for-business (12 answers)
- https://synthflow.ai/blog/8-best-ai-voice-agents-for-business-in-2026 (12 answers)
- https://nextlevel.ai/enterprise-ai-voice-platforms (11 answers)
- https://parloa.com/knowledge-hub/voice-ai-for-enterprises (9 answers)
- https://fin.ai/learn/ai-voice-agent-security-compliance (8 answers)

## Warned against

- Vapi: 16 of 41 labels negative. "Highly flexible but low-governance options like Vapi AI... this can lead to compliance gaps, prompt injection vulnerabilities" (Grok 4.20, negative prompt)
- Retell AI: 14 of 50 labels negative. "Platforms to Avoid for "Predictable Cost" | Vapi/Retell/Bland AI | $0.05–$0.12/min + provider fees" (Kimi K2, budget prompt)
- Bland AI: 9 of 31 labels negative. "Platforms to Avoid for "Predictable Cost" | Vapi/Retell/Bland AI | $0.05–$0.12/min + provider fees" (Kimi K2, budget prompt)
- Synthflow: 8 of 38 labels negative. "the fragility noted in enterprise reviews is not in the agent itself, it is in the stack underneath it" (Muse Glimmer 30B, negative prompt)

## Movement since October 2026

Floor: 11 points of share, measured on the calibration repeat.
New leader: PolyAI (21%) to Synthflow (19%). Margin 6 points, within noise.

- Synthflow: 2% to 19%, +17. Cleared the floor by 6 points · rank 13 → 1 of 111.
- NiCE Cognigy: 0% to 11%, +11. Cleared the floor by 0 points · rank 23 → 4 of 111.
- PolyAI: 21% to 13%, −8. Inside the floor by 3 points · rank 1 → 2 of 111.
- Sierra: 7% to 0%, −7. Inside the floor by 4 points · rank 5 → 21 of 111.
- Parloa: 7% to 0%, −7. Inside the floor by 4 points · rank 6 → 23 of 111.
- Cognigy: 10% to 4%, −6. Inside the floor by 5 points · rank 3 → 7 of 111.
- Kore.ai: 3% to 7%, +4. Inside the floor by 7 points · rank 10 → 5 of 111.
- Rasa Voice: 5% to 2%, −3. Inside the floor by 8 points · rank 7 → 9 of 111.
- Retell AI: 14% to 13%, −1. Inside the floor by 10 points · rank 2 → 3 of 111.
- Vapi: 5% to 4%, −1. Inside the floor by 10 points · rank 9 → 8 of 111.
- Bland AI: 7% to 7%, ±0. Inside the floor by 11 points · rank 4 → 6 of 111.
- Deepgram Voice Agent API: 2% to 2%, ±0. Inside the floor by 11 points · rank 11 of 111, unchanged.

## Record

- Method: https://www.gane.ai/index/gtm/methodology
- License: CC BY 4.0. Cite as Gane Index, November 2026 Edition, www.gane.ai/index/gtm.