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ElevenLabs Agents vs Sierra AI (2026)

Comparing ElevenLabs Agents and Sierra AI? Both are AI Agents & Chatbots and Voice & Phone AI tools in the directory, which is why buyers put them on the same shortlist. Below is a side-by-side look at pricing and an estimated monthly bill, channels, compliance claims, and integrations, plus when each is the better fit, so you can pick on the facts rather than either vendor's own sales page.

At a glance

Conversations/mo

% handled by AI

Agent seats

Price it at my volume

Estimates assume 5,000 conversations a month, 60% handled by AI and 10 agent seats, at each vendor's published list price (the cost calculator's model); treat them as a floor, not a quote. Compliance rows are what vendors publicly claim, and “Not verified” means we have not confirmed that fact yet, not that the tool lacks it.

Choose ElevenLabs Agents or Sierra AI?

About ElevenLabs Agents

ElevenLabs Agents (marketed as ElevenAgents) is the conversational agent platform from ElevenLabs, the voice AI company. It is a horizontal builder platform like Vapi or Retell rather than a support product, but ElevenLabs sells a dedicated customer support offering on top of it and makes the case directly: agents that resolve order tracking, billing, account and troubleshooting requests, escalate to humans with the full conversation history, and log tickets and update cases in Zendesk, Salesforce or ServiceNow. You build an agent from a prompt or template in a visual builder, give it a knowledge base with RAG, define workflows, actions and escalation paths, then monitor and A/B test it. One agent design deploys across phone, web chat, email, WhatsApp and SMS.

The distinctive thing is the voice. ElevenLabs owns its speech-to-text and text-to-speech models and co-locates transcription, the LLM and synthesis to keep latency sub-second, with 10,000+ voices or a clone of your own, emotional expressiveness, and automatic language detection and switching across 90+ languages. Telephony connects through Twilio, Genesys, Vonage, Telnyx, Plivo or any SIP trunk, and there are 400+ pre-built integrations. You choose the LLM, including custom models. For regulated buyers it offers zero retention mode, EU data residency, VPC deployment and BAAs on Enterprise, and it holds SOC 2 Type II, ISO 27001, ISO 42001 and PCI DSS Level 1, plus a FedRAMP 20x Class A authorization added in October 2026.

ElevenLabs was co-founded by CEO Mati Staniszewski and raised its first round in 2022. In September 2026 a $300 million employee tender valued it at $22 billion, double its Series D valuation that February, and the company said enterprise now accounts for 55 percent of revenue, driven by businesses adopting agents to support customers and employees. Logos on the support page include Revolut, Deliveroo, Meesho, Cisco and Deutsche Telekom, though the page names no specific support results.

Pricing is published and billed by call minutes. A free plan includes 15 minutes; Starter is $6 per month for 75 minutes, Creator $22, Pro $99, Scale $299 and Business $990 for 12,375 minutes, with extra minutes at $0.08, text messages at $0.003 and LLM usage billed on top. Choose ElevenLabs Agents if voice quality and language coverage are what your support experience lives or dies on and you have someone to build and own the agent. Skip it if you want a finished support product with a helpdesk, analytics and resolution-based pricing out of the box, since this is a platform you assemble.

Read the full ElevenLabs Agents listing →  ·  See ElevenLabs Agents alternatives →

About Sierra AI

Sierra builds conversational AI agents for the enterprise, and it arrived with about as much star power as a startup can carry. It was founded in 2023 by Bret Taylor and Clay Bavor, and if those names ring a bell it is because Taylor co-created Google Maps, served as CTO of Facebook and co-CEO of Salesforce, and currently chairs the board of OpenAI, while Bavor spent eighteen years at Google leading its virtual and augmented reality work. Company lore says the whole thing was hatched over a grilled branzino lunch in Palo Alto.

The product lives up to the pedigree. From a single build, Sierra deploys a branded agent across chat, voice, email, SMS, and even ChatGPT, following your policies, adopting your brand's voice, and escalating gracefully when a conversation gets thorny. Its voice agents are a standout: they hold natural, low-latency conversations, read sentiment, and can even take a credit card or ACH payment over the phone in one uninterrupted call, with no clumsy handoff to a separate system.

Under the hood sits Agent OS, a platform for building, testing, and supervising agents, with tooling to run voice simulations and rehearse behavior before anything reaches a real customer. Pricing is outcome-based, tied to conversations or successful resolutions and wrapped in multi-year enterprise contracts, so Sierra is aimed at large brands rather than weekend experimenters. Reported customers include SoFi, Ramp, and Brex, and the company says its agents already serve a meaningful slice of the Fortune 50.

Sierra's fundraising has kept pace with its towering ambition, vaulting the company into the rarefied tier of the most valuable AI startups in barely two years. For enterprises that want polished, on-brand agents across every channel and are willing to invest the time and budget to do it properly, Sierra is a genuine marquee choice.

Read the full Sierra AI listing →  ·  See Sierra AI alternatives →

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