Best Voice Agent Platforms 2026: 9 Compared on Real All-In Cost

The voice agent platforms developers actually evaluate in 2026, compared on what a minute really costs once the LLM, speech, and telephony are added. Most headline rates are platform fees, not bills. SpeechifyAI is all-in from $0.07/min.

Luke Oliff Developer Relations · SpeechifyAI Labs

August 6, 2026 9 min read

Every voice agent platform publishes a per-minute price. Almost none of them are what you will pay. The number on the pricing page is usually a platform fee, and the large language model, speech-to-text, text-to-speech, and telephony arrive as separate line items you assemble yourself. That is why teams routinely quote a $0.05/min platform and then see $0.15/min on the invoice.

This comparison covers the nine platforms developers actually shortlist in 2026, and it ranks them on one thing: what one minute of conversation costs when everything needed to hold that conversation is included. Rates below are the published pay-as-you-go figures, verified against each vendor’s own pricing page.

The comparison at a glance

Platform	Headline rate	What that rate excludes	Realistic all-in
SpeechifyAI	$0.07/min	Nothing. LLM, STT, TTS, orchestration included	$0.07/min
Hume	$0.04 to $0.07/min	The LLM, billed by your own provider	$0.04/min + LLM
Vapi	$0.05/min	STT, LLM, TTS all passthrough	~$0.10 to $0.20/min
Cartesia	$0.06/min	Telephony; “free LLM” is a limited-time promo	$0.074/min + LLM later
Deepgram	$0.075/min	Telephony; idle websocket time is billed	$0.075/min + telephony
ElevenLabs	$0.08/min	The LLM and telephony, both billed on top	$0.08/min + LLM + telephony
Synthflow	$0.08/min	Per-minute LLM add-ons; this is a trial rate	Enterprise from $30K/year
Retell	$0.055/min infra	TTS, LLM, telephony	$0.115 to $0.23/min by model
Bland	$0.11 to $0.14/min	Nothing, but the low end needs a platform fee	$0.11/min + $299 to $499/mo

Two patterns fall out of that table.

First, the cheapest headline is rarely the cheapest bill. Vapi’s $0.05 and Retell’s $0.055 are the two lowest numbers on the page, and both land near or above $0.11 once assembled. On Retell with a current-generation model it passes $0.23, more than four times the headline. Bland’s $0.11 looks like the most expensive rate until you notice it is one of the few that is genuinely all-in, and then that the lower end of its range sits behind a $299 to $499 monthly platform fee.

Second, “LLM included” is doing a lot of work. Hume’s $0.04 is the lowest voice rate here and excludes the model that does the actual thinking. Cartesia bundles an LLM today as a limited-time promotion. When you compare, hold the LLM constant or you are not comparing.

You do not have to take my word for the first point, because the vendors say it themselves. Vapi’s own comparison table puts the exclusion in the section heading:

Vapi pricing table with a section headed Vapi Hosting Cost, subtitled Excludes Model Provider Costs, listing calls at 0.05 dollars per minute, above a separate section headed Model Provider Cost for speech-to-text, LLM and text-to-speech billed at cost — Vapi's pricing page, read 6 August 2026. The $0.05/min headline is the hosting cost; speech-to-text, the LLM, and text-to-speech are a separate section billed at cost.

Retell is more transparent still, and the itemisation is where the real number appears. Voice infrastructure is $0.055/min, text-to-speech is a separate $0.015 to $0.040/min, and the LLM is its own table where a recommended model runs from $0.045/min to $0.32/min depending on which one you pick:

Retell pricing page showing three separate tables: Conversation Voice Engine at 0.055 dollars per minute, Text-to-speech from 0.015 to 0.040 dollars per minute by voice provider, and an LLM table where GPT 5.5 costs 0.16 dollars per minute standard and 0.32 dollars per minute on the fast tier — Retell's pricing page, read 6 August 2026. The $0.055/min platform rate is one of three lines. On GPT 5.5 the LLM alone costs $0.16/min, roughly three times the platform fee.

That is the pattern in one screenshot. A $0.055/min headline and a $0.16/min language model sitting in a different table on the same page.

How to read a voice agent pricing page

Four questions separate a real number from a marketing one. Ask them in this order.

Is the LLM included? This is the single largest swing. An agent turn costs both input and output tokens, and on a chatty model that alone can exceed the entire platform fee.
Is telephony included? Inbound and outbound PSTN minutes are a separate wholesale cost on most platforms. Cartesia adds $0.014/min. Deepgram and ElevenLabs bill it separately.
What exactly is billed as a minute? Talk time and connection time are not the same. Deepgram bills while the websocket is open, so silence, hold music, and a caller thinking all count.
Is the headline rate gated? Bland’s cheapest tier needs a monthly fee. Synthflow’s $0.08 is a trial rate against enterprise contracts starting at $30,000/year.

A platform that answers “yes, yes, talk time, no” to those four is quoting you a real number.

The platforms

SpeechifyAI

One rate, from $0.07/min on Pro, covering the LLM, speech-to-text, text-to-speech, and orchestration. No passthrough, no token math, no separate telephony line. The speech layer is Simba 3.2, which is #1 on the Artificial Analysis Speech Arena, above every ElevenLabs, Cartesia and Google model, so the voice quality is not the compromise in exchange for the price. Deterministic workflows, tool calling, evals, and enterprise governance ship with it, and the free tier is 60 minutes a month with full commercial use.

Pick it if: you want one forecastable bill and top-rated speech without assembling four vendors.

ElevenLabs

The best-known voice brand, and Conversational AI is a genuinely capable agent layer built on that TTS heritage. The catch is structural: $0.08/min is a platform fee, with the LLM and telephony billed on top, and concurrency above your tier doubles the rate to $0.16/min. Its platform fee alone costs more than SpeechifyAI’s entire bill. What you are buying is the 10,000+ voice library, which nothing else here matches.

Pick it if: voice variety is the deciding factor and the assembled cost is acceptable.

Vapi

The most developer-flexible option on this list, and deliberately unbundled: $0.05/min buys orchestration and you bring speech-to-text, the LLM, text-to-speech, and telephony. That is genuinely the right shape if you have strong opinions about each layer or existing contracts you want to keep. Expect roughly $0.10 to $0.20/min once assembled.

Pick it if: you want to choose every layer yourself and can manage four vendors.

Retell

Low-latency voice infrastructure with the most itemized pricing on this list, which is to Retell’s credit: every line is published. Voice infrastructure is $0.055/min, text-to-speech is $0.015/min on their platform voices (or $0.040 for ElevenLabs voices), and the LLM is its own table. Pick GPT 4.1 at $0.045/min and you land near $0.115 all-in. Pick GPT 5.5 and the LLM alone is $0.16/min standard or $0.32 on the fast tier, which takes the total past $0.23. Add-ons stack on top: knowledge base at $0.005/min, PII redaction at $0.01/min, AI QA at $0.10/min.

Pick it if: you want granular control of what you pay for and are comfortable itemizing.

Bland

Built for high-volume outbound, with one of the few genuinely all-in numbers here at $0.11 to $0.14/min. Bland sells against exactly the problem this post is about, and the wording on its own pricing page is the clearest statement of it from anyone in the category: “No token charges. No model-provider pass-throughs. No surprise bills.” The honest catch is that the bottom of the range is gated. $0.14/min carries no platform fee, $0.12/min needs $299/month, and $0.11/min needs $499/month, so the effective rate depends heavily on volume.

Pick it if: you are running outbound at volume that amortizes the platform fee.

Deepgram

Strong, low-level infrastructure. The Voice Agent API bundles speech-to-text, the LLM, and text-to-speech at $0.075/min, which is a good number. Two things to model: telephony is separate, and billing runs on connection time rather than talk time, so an open websocket accrues cost while nobody is speaking. Bringing your own LLM and TTS can reach roughly $0.05/min if you want to do that work. Deepgram’s Aura-2 is also the strongest model on this list for structured enterprise speech, drug names, account numbers, and legal citations.

Pick it if: you want infrastructure-level control and your traffic pattern suits connection-time billing.

Cartesia

Ultra-low-latency voice infrastructure with a $0.06/min headline. Telephony adds $0.014/min, taking the real floor to $0.074/min, and the bundled LLM is a limited-time promotion rather than a permanent part of the price, so model what happens when it ends. Sonic 3.5 is a genuinely fast model with Elo 1,203 on the arena.

Pick it if: latency is a hard requirement and you can absorb the promo ending.

Synthflow

A no-code-forward platform with a $0.08/min trial rate. The main pricing surface leads with enterprise contracts starting at $30,000/year, so treat the trial rate as an evaluation number rather than a production one, and expect per-minute LLM add-ons.

Pick it if: you want a visual builder and are heading toward an enterprise contract anyway.

Hume

Hume’s EVI is the most emotionally expressive speech-to-speech model here, priced at $0.04 to $0.07/min. That covers voice only; the LLM is billed separately by your provider, and the lowest rate needs a large plan. Its free tier is 5 minutes.

Pick it if: emotional expressiveness is the product and you already have an LLM contract.

Which voice agent platform should you actually pick?

If you need the widest voice library, ElevenLabs. If you want to own every layer, Vapi. If your priority is raw latency, Cartesia. If your agent reads back policy numbers and prescription names all day, Deepgram Aura-2 is built for that. If emotional range is the product, Hume.

For most teams shipping a production voice agent, the deciding factor is that the bill has to be forecastable before the traffic exists. That is where a single all-in rate wins: from $0.07/min with the LLM, speech-to-text, text-to-speech, and orchestration included, on a speech model rated #1 on an independent blind listener leaderboard. One number to model, one vendor to reconcile.

You can start free with 60 minutes a month and full commercial use, no card, and check the pricing and the agent comparisons before you write any code.

See the docs to wire one up.

FAQ

What is the best voice agent platform in 2026? It depends on what you are optimizing for, but on all-in cost SpeechifyAI is the lowest genuinely bundled rate at $0.07/min with the LLM, speech-to-text, text-to-speech, and orchestration included. ElevenLabs leads on voice library size, Vapi on layer-by-layer control, Cartesia on latency, and Deepgram on structured enterprise pronunciation.

How much does a voice agent cost per minute? Published rates run from $0.04 to $0.14 per minute, but most are platform fees that exclude the LLM and telephony. A realistic all-in figure for an assembled stack is $0.10 to $0.20 per minute. Fully bundled platforms land between $0.07 and $0.14.

Which voice agent platforms include the LLM in the price? SpeechifyAI includes it permanently at $0.07/min. Deepgram bundles it at $0.075/min. Cartesia includes one as a limited-time promotion. ElevenLabs, Vapi, Hume, and Retell all bill the LLM separately.

Is ElevenLabs or SpeechifyAI better for voice agents? ElevenLabs has the larger voice library, over 10,000 voices. SpeechifyAI is cheaper in practice because $0.07/min is all-in while ElevenLabs’ $0.08/min is a platform fee with the LLM and telephony on top, and its speech model rates above every ElevenLabs model on the Artificial Analysis Speech Arena. Pick ElevenLabs when voice variety is the requirement.

What is the difference between a platform fee and an all-in rate? A platform fee covers orchestration only, so you separately pay for speech-to-text, the LLM, text-to-speech, and telephony. An all-in rate covers all of it. This is why a $0.05/min platform fee often costs more in practice than a $0.07/min all-in rate.