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

GTM AI Recommendation Index, October 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 October 2026 Edition on October 4, 2026; its answers are read by the distilled judge (ai-indexes-judge-qwen3-14b-run3), not the claude-opus-5 judge of the earlier categories. Page: https://gtm-ai-index.com/customer/ai-voice-agents/enterprise/

**Standing:** PolyAI leads with 21% of first choices; verdict contested. 58 first choices across the direct, paraphrase, budget and scale prompts.

## First-choice share

| # | Product | Share | Negative rate | Labels |
|---|---|---|---|---|
| 1 | PolyAI | 21% | 8% | 36 |
| 2 | Retell AI | 14% | 18% | 38 |
| 3 | Cognigy | 10% | 10% | 30 |
| 4 | Bland AI | 7% | 21% | 33 |
| 5 | Sierra | 7% | 5% | 19 |
| 6 | Parloa | 7% | 0% | 15 |
| 7 | Rasa Voice | 5% | 0% | 11 |
| 8 | Vapi | 5% | 43% | 28 |
| 9 | Kore.ai | 3% | 0% | 12 |
| 10 | Deepgram Voice Agent API | 2% | 0% | 11 |
| 11 | Synthflow | 2% | 29% | 17 |

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

- Claude Haiku 4.5: Kore.ai; alternatives Bland AI, Cognigy, Retell AI, Synthflow
- GPT-5.4 mini: Parloa; alternatives AWS, Amazon Connect, Deepgram Voice Agent API, ElevenLabs
- Gemini 3.5 Flash: PolyAI; alternatives Aloware, Bland AI, Cognigy, Retell AI
- Perplexity Sonar: Cognigy; alternatives PolyAI, Regal, Replicant, Salesforce Service Cloud
- Grok 4.1 Fast: Bland AI, Retell AI; alternatives Cognigy, PolyAI, Vapi
- Mistral Small: Kore.ai; alternatives Bland AI, Deepgram Voice Agent API, Parloa, Retell AI
- DeepSeek V4 Flash: Bland AI, Sierra; alternatives Cognigy, Kore.ai, Rasa Voice, Synthflow
- Llama 4 Maverick: Decagon, PolyAI
- Qwen 3.7 Flash: Vapi; alternatives Cognigy, PolyAI, Retell AI, Synthetic
- Kimi K2: Retell AI; alternatives 11x, Bland AI, Cognigy, Poly AI
- GLM 4.7 FlashX: Cognigy; alternatives Parloa, Regal.ai
- MiniMax M2.5: Retell AI, Sierra; alternatives Deepgram Voice Agent API, Synthflow
- GPT-6 Luna: Cognigy; alternatives Genesys Cloud AI, PolyAI, Retell AI
- Muse Glimmer 30B: Parloa, PolyAI; alternatives Bland AI, Regal, Retell AI, Sierra

## Sources the answers cite

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

- retellai.com: 59 answers, 131 citations
- cloudtalk.io: 37 answers, 68 citations
- rasa.com: 28 answers, 40 citations
- bland.ai: 26 answers, 42 citations
- synthflow.ai: 23 answers, 39 citations
- parloa.com: 22 answers, 36 citations
- getvoip.com: 20 answers, 20 citations
- deepgram.com: 19 answers, 25 citations

Pages named in the most answers:

- https://rasa.com/blog/best-ai-voice-agents (21 answers)
- https://retellai.com/blog/best-ai-voice-agent-solutions-for-business-phone-systems (20 answers)
- https://parloa.com/knowledge-hub/ai-voice-agent-solutions (18 answers)
- https://retellai.com/blog/best-ai-voice-agent-services-businesses (18 answers)
- https://retellai.com/blog/best-voice-ai-providers (15 answers)
- https://cloudtalk.io/blog/best-ai-voice-agents-for-customer-support-and-service (13 answers)
- https://getvoip.com/blog/ai-voice-agents (12 answers)
- https://lindy.ai/blog/ai-voice-agents (11 answers)
- https://rasa.com/blog/best-ai-agents-for-enterprise (11 answers)
- https://brilo.ai/resources/best-ai-voice-agents (10 answers)

## Warned against

- Vapi: 12 of 28 labels negative. "Avoid per-minute platforms if predictability is your #1 priority" (DeepSeek V4 Flash, budget prompt)
- Bland AI: 7 of 33 labels negative. "The main platforms to avoid or scrutinize closely are:

- Bland AI — Repeatedly described as better for engineering-led teams and not ideal if you want no-code, self-serve deployment" (Perplexity Sonar, negative prompt)
- Retell AI: 7 of 38 labels negative. "inconsistent response timing/interruptions at scale; custom pricing hides true enterprise TCO; limited governance/audit trails" (Grok 4.1 Fast, negative prompt)
- Synthflow: 5 of 17 labels negative. "lacks complex workflow depth, enterprise governance, and proven global scale; some reviews note routing weaknesses" (Grok 4.1 Fast, negative prompt)

## Record

- Method: https://gtm-ai-index.com/methodology/
- Raw judge labels and full responses: https://gtm-ai-index.com/data/
- License: CC BY 4.0. Cite as GTM AI Recommendation Index, October 2026 Edition, gtm-ai-index.com.