# The Best AI Voice Agents (2026)

> Source: https://theagentsindex.com/best-ai-voice-agents (curated, quality-gated, re-verified)

Ask any of these six vendors what a call costs and you will get a different kind of answer — and one of them will remind you that you don't have to pay a vendor for the infrastructure at all. Vapi, Retell AI and ElevenLabs Conversational AI all quote a per-minute or per-plan headline rate that covers only part of the pipeline — the language model, the voice and (for two of them) the phone line itself bill separately on top, and each vendor's own listing admits the real all-in cost typically runs meaningfully above the number on the pricing page. Bland AI owns its full stack and charges one published, all-inclusive per-minute rate with no separate pass-throughs. LiveKit Agents is the exception on ownership: an open-source, Apache 2.0 framework you can self-host entirely, or run on its managed Cloud tier, rather than a closed API you can only rent.

A third split is about company maturity and how open the door is. PolyAI predates every other platform here by years — founded in 2017, versus 2021 or later for the rest — and it shows in scale: 200+ named enterprise customers and thousands of live deployments across 75+ languages, backed by a $750M valuation with NVIDIA's NVentures among its Series D investors. Until May 2026 it was also the most closed of the six: sales-led only, no public price at all. That changed with a self-serve tier, free for two months from just an email address — though PolyAI has not disclosed what happens once that period ends, and its flagship enterprise deployments (like PG&E's 16-million-call-a-year operation) still run through a separate, custom-quoted sales engagement.

So before comparing features, compare those three things — who owns the infrastructure, how the bill is really built, and how much enterprise track record and sales process still comes with the vendor. This is the 6 Published, independently researched AI voice agent platforms in our index, ordered from maximum build-your-own flexibility, through the voice-quality specialist's own agent layer, to the platform that owns and publishes its entire stack's price, closing with the two extremes of maturity: the newest, fully open-source option, and the oldest, enterprise-proven incumbent now opening up.

| # | Name | What it is | Pricing | API |
| --- | --- | --- | --- | --- |
| 1 | [Vapi](https://theagentsindex.com/vapi.md) | The developer platform for voice AI agents, bring your own model, voice and telephony, and Vapi orchestrates the call. | $0.05 / min | Yes |
| 2 | [Retell AI](https://theagentsindex.com/retell-ai.md) | A voice AI platform for human-sounding phone agents, build a call flow, plug in your model and telephony, ship. | $0.07–$0.31 / min | Yes |
| 3 | [Bland AI](https://theagentsindex.com/bland-ai.md) | Enterprise voice AI that runs on its own infrastructure, build calls as conversational pathways, priced all-in per minute. | $0.14 / min | Yes |
| 4 | [ElevenLabs Conversational AI](https://theagentsindex.com/elevenlabs-conversational-ai.md) | The voice-quality specialist’s own agent layer, 10,000+ voices and instant cloning, with a bring-your-own-LLM brain. | $0 / mo | Yes |
| 5 | [LiveKit Agents](https://theagentsindex.com/livekit-agents.md) | The open-source, self-hostable voice agent framework, Apache 2.0, provider-agnostic, and the infrastructure behind ChatGPT’s Advanced Voice Mode. | $0 / month | Yes |
| 6 | [PolyAI](https://theagentsindex.com/polyai.md) | The pre-LLM-era enterprise voice AI incumbent — $750M-valued, 200+ enterprise customers — that opened a genuine self-serve, free-to-start tier in May 2026. | Free / for the first 2 months | Yes |

## Methodology

Every entry is a Published listing that already cleared this site's per-listing quality gate — sourced facts, admitted weaknesses, a "best for" and a "not for," re-verified on a rolling cadence (see /methodology). The ordering runs from the most build-your-own hosted platform (Vapi) through the voice-quality specialist's own agent layer (ElevenLabs Conversational AI) to the published all-inclusive hosted option (Bland AI) and the genuinely open-source, self-hostable option (LiveKit Agents), closing with the oldest and most enterprise-proven platform (PolyAI) — grouped around the ownership-and-pricing-transparency split described above rather than a single "best overall" pick, since the six serve different buying priorities. The live score chip on every card (evidence, honesty, depth, freshness) is computed the same way as that tool's own listing page.