Retell AI vs Vapi
Five of fourteen models named Retell AI first on the direct prompt; zero named Vapi. Both were named by all fourteen models and Retell AI carries 58 labels and Vapi 39, so the shares are not directly comparable.
Named in two categories this edition.
Named in one category this edition.
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; every quote names the model and the prompt it came from. Both figures come from the AI voice agents page.
By framing
Retell AIFirst choices, of fourteen modelsVapi
Across every category in the October 2026 Edition, Retell AI and Vapi were named in the same answer ninety-six times, of the 158 answers naming Retell AI and the 107 naming Vapi. In those answers Vapi took the first choice thirteen times and Retell AI twenty-seven.
Every model, every framing
| Model | Direct | Paraphrase | Comparative | Budget-constrained | Scale-constrained | Negative |
|---|---|---|---|---|---|---|
| Claude Haiku 4.5 | | | | | ||
| GPT-5.4 mini | | | | |||
| Gemini 3.5 Flash | | | | | | |
| Perplexity Sonar | | | | |||
| Grok 4.1 Fast | | | | | | |
| Mistral Small | | | | |||
| DeepSeek V4 Flash | | | | | | |
| Llama 4 Maverick | | | ||||
| Qwen 3.7 Flash | | | | | ||
| Kimi K2 | | | | | | |
| GLM 4.7 FlashX | | | | |||
| MiniMax M2.5 | | | | |||
| GPT-6 Luna | | | | | | |
| Muse Glimmer 30B | | | | | |
Retell AI Vapi first choice named as an alternative argued againstblank: not namedEach cell is one answer, Retell AI on the left and Vapi on the right.The direct prompt
Retell AI first, Vapi an alternative
5 of 14 modelsVapi was named in the answer but not as the choice, or not at all.Neither was the first choice, one was named
7 of 14 modelsThe answer put something else first and named one of the two as an alternative.Neither was named
2 of 14 modelsThe answer made no first choice from these two in this category.Bold names in an answer are the products the judge labeled a first choice; a model naming several gives each of them that label. The full answer text for every row is in the record.
By buyer segment
What the models said about Retell AI
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Six of eight in this category shown.
“some specific products (for example Synthflow, ElevenLabs, Retell AI, Deepgram) have recurring complaints about cost or credit limits” GPT-5.4 mini · negative prompt · soft negative
“Both Vapi.ai and Retell AI can suffer from latency and reliability issues due to reliance on external API providers” Claude Haiku 4.5 · negative prompt · soft negative
“While popular among developers, there is significant frustration in the community regarding its operational setup.” Qwen 3.7 Flash · negative prompt · soft negative
“Best all-around voice AI platform for production call automation... "best overall — lowest effective cost, highest voice quality, full API and no-code in one platform"” Muse Glimmer 30B · comparative prompt · first choice
“Strong all-around balance of latency, price, and accessibility; often described as a fast, transparent usage-based option with native telephony and quick setup.” Perplexity Sonar · comparative prompt · first choice
“*Developer-first / Infrastructure:* Vapi, Retell AI, Vocode, or Bland.ai. (Excellent for high customization, low latency, and BYO keys).” Gemini 3.5 Flash · scale prompt · first choice
What the models said about Vapi
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Six of eight in this category shown.
“Vapi — Pricing Concerns - 55% price increase in December 2025” Kimi K2 · negative prompt · hard negative
“"API-First Only" Tools (e.g., Vapi, ElevenLabs): If you are not a developer, you should strictly avoid platforms that offer no visual builder” Qwen 3.7 Flash · negative prompt · soft negative
“it should be avoided or heavily vetted for regulated data like PHI, PCI, or GDPR-protected data without a signed Business Associate Agreement” Muse Glimmer 30B · negative prompt · soft negative
“*Developer-first / Infrastructure:* Vapi, Retell AI, Vocode, or Bland.ai. (Excellent for high customization, low latency, and BYO keys).” Gemini 3.5 Flash · scale prompt · first choice
“Choose Vapi if you want the fastest path to a production phone agent or a configurable voice-agent stack across many providers.” GPT-5.4 mini · comparative prompt · first choice
“For pure usage cost, Vapi is the lowest hosting entry point and Retell is the most quoted all-in low price with no platform fee.” Muse Glimmer 30B · budget prompt · first choice
Comparisons are drawn for the top eight products in each category, each against each. The output is the models' output; nothing here is a recommendation by the index.