AI voice agents · October 2026 Edition
CloudTalk vs Sierra
Eight of fourteen models named CloudTalk first on the direct prompt; zero named Sierra. CloudTalk was named by eleven of the fourteen models and Sierra by seven and CloudTalk carries 24 labels and Sierra 11, so the shares are not directly comparable.
Named in thirteen categories this edition.
Named in three categories this edition.
First-choice share19%2%Of first choices across the direct, paraphrase, budget and scale prompts, 0 to 100.
Negative rate8%55%Negative labels as a share of the product's labels, 0 to 100.
Rank in category#2#6A position in a field of 8; printed, not drawn.
Labels2411A count; the two differ.
The two percentage rows are drawn on one 0 to 100 track, CloudTalk reading right to left. Rank and label count are printed, not drawn.Retell AI was named alongside these two in twelve of the fourteen direct answers. Retell AI vs CloudTalk · Retell AI vs Sierra · CloudTalk vs Vapi
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
How many of the fourteen models made each the first choice, per way of asking, and how many argued against it.
CloudTalkFirst choices, of fourteen modelsSierra
Direct801 against Sierra
Paraphrase411 against CloudTalk · 1 against Sierra
Comparative00
Budget-constrained00
Scale-constrained00
Negative001 against CloudTalk · 4 against Sierra
Bars are first choices, 0 to 14 each sideModels that argued againstA model can name both, so the two sides of a row do not sum to fourteen.
Every model, every framing
The eighty-four answers behind the chart above, one cell each: where CloudTalk and Sierra stood in it.
| 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 | |
CloudTalk Sierra first choice named as an alternative argued againstblank: not namedEach cell is one answer, CloudTalk on the left and Sierra on the right.The direct prompt
The plain question, one answer per model, grouped by where CloudTalk and Sierra stood in it.
CloudTalk first, Sierra not the choice
8 of 14 modelsSierra was named in the answer but not as the choice, or not at all.Perplexity SonarCloudTalk alternatives: Retell AI, Salesforce Agentforce Voice, Synthflow AI
Mistral SmallCloudTalk, Retell AI alternatives: ElevenLabs Conversational AI, Leaping AI
Llama 4 MaverickAloware, CloudTalk alternatives: GetVoIP, Plivo
Qwen 3.7 FlashCloudTalk alternatives: Bland AI, Retell AI, Rezora IO
Kimi K2CloudTalk alternatives: Aloware, Retell AI, Synthflow
GLM 4.7 FlashXCloudTalk alternatives: Bland AI, Retell AI, Synthflow, Vapi.ai
MiniMax M2.5CloudTalk, Synthflow alternatives: Retell AI
Muse Glimmer 30BAloware, CloudTalk alternatives: HubSpot Breeze AI, Retell AI, Synthflow
Neither was the first choice, one was named
2 of 14 modelsThe answer put something else first and named one of the two as an alternative.Grok 4.1 FastRetell AI alternatives: Bland AI, CloudTalk, Regal, Synthflow
DeepSeek V4 FlashRegal, Retell AI alternatives: CloudTalk, Synthflow AI
Neither was named
4 of 14 modelsThe answer made no first choice from these two in this category.Claude Haiku 4.5Aloware, Retell AI alternatives: Synthflow, Vapi
GPT-5.4 miniTwilio alternatives: Deepgram Voice Agent API, OpenAI Realtime / Voice agents
Gemini 3.5 FlashAloware, Synthflow AI alternatives: Bland AI, Retell AI, Vapi
GPT-6 LunaRetell AI alternatives: PolyAI, Synthflow, Vapi
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
The same question asked on behalf of a different buyer. Each standing is computed within its segment and they are never added together. The figures above are the mid-market standing, which is the one the category orders by.
Small business
CloudTalk leads by fifteen points.
CloudTalk15%#2 of 7Sierra0%#– of 7Mid-marketThe figures above
CloudTalk leads by seventeen points.
CloudTalk19%#2 of 8Sierra2%#6 of 8Enterprise
The order flips: Sierra leads at enterprise.
Sierra7%#5 of 11CloudTalk0%#– of 11What the models said about CloudTalk
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Two of two in this category shown.
“Billing disputes and auto-renewal complaints on Trustpilot ... not for standalone AI voice agent use.” DeepSeek V4 Flash · negative prompt · soft negative
“CloudTalk is called an "ideal voice agent solution for SMBs and mid-market sales teams that need an all-in-one platform for sales calls, follow-ups, and analytics"” Muse Glimmer 30B · direct prompt · first choice
What the models said about Sierra
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Six of seven in this category shown.
“Why avoid: Not suitable for mid-market buyers or those with under 100 concurrent calls.” Mistral Small · negative prompt · hard negative
“Sierra - if you have under 100 concurrent calls, no dedicated operations team, or if your budget is under $50,000 annually.” Llama 4 Maverick · negative prompt · soft negative
“Not recommended for mid-sized B2B companies unless you have a massive support volume and a large budget.” DeepSeek V4 Flash · paraphrase prompt · soft negative
“1. Sierra (Best Overall for Mid-Market B2B)” Claude Haiku 4.5 · paraphrase prompt · first choice
“Choose Sierra if you are a large enterprise brand looking for a premium, omnichannel solution” GLM 4.7 FlashX · comparative prompt · alternative
“Sierra AI is best for maximum brand governance and tone control” Claude Haiku 4.5 · comparative prompt · alternative
Also compared
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.