Ranked by cost per minute

Cheapest voice AI platforms (2026)

Ranked by real all-in cost per minute for a typical production workload. Flat-fee, bundled and BYOK pricing compared honestly — including where the cheap option is actually the wrong pick.

See the picks

Transparency disclosure

ThinnestAI publishes this list and ranks itself #1. We compute cost using publicly available pricing, one realistic provider stack per platform, and explicitly disclose the assumptions. If a competitor is genuinely cheaper for your workload, we say so.

Ranked by cost per minute5 platforms

1ThinnestAI

2Bland AI

3Retell AI

4Vapi

VOICE AI PRICING · 100,000 MIN/MO

How much does voice AI actually cost at scale?

Real all-in monthly cost for a production Hindi workload, INR at ₹83 / $.

OpenAI Realtime

₹0/month

Vapi

₹0/month

Retell AI

₹0/month

Bland AI

₹0/month

ThinnestAI

₹0/month

Method

How we ranked

Weighted criteria. Every score is defensible from public sources — pricing pages, docs, customer reviews and production benchmarks.

Criterion	Weight	What it measures
All-in cost per minute	50%	Platform fee plus typical BYOK provider stack at production volume.
Pricing transparency	20%	Public rate card, no quote-based surprises, INR billing where relevant.
Provider flexibility	15%	Ability to switch to cheaper providers as the market evolves.
Hidden fees	10%	GST, setup, per-seat surcharges, minimum commits.
Free tier	5%	What you can try before paying.

The ranking

The picks

ThinnestAI

That's us

From ₹2/min flat, all-inclusive — telephony plus the ThinnestAI Stack (curated LLMs for intelligence and low latency + Sarvam v2 TTS and STT) all in the one rate for a production Indian-language workload.

Pricing

From ₹2/min flat, all-inclusive — telephony and the full voice stack included, no separate provider bills.

Strength

Lowest all-in cost for Indian-language workloads. Free tier includes platform-managed Sarvam with zero API keys required.

Weakness

Less brand recognition than Vapi in global developer communities.

Try ThinnestAI live See pricing

#1 · ThinnestAIStrength

Lowest all-in cost for Indian-language workloads.

Free tier includes platform-managed Sarvam with zero API keys required.

Bland AI

Bundled "connected minute" pricing — $0.11–$0.14/min all-in for English outbound.

Pricing

$0.11–$0.14/min bundled (Start / Scale plans). Everything included in one line item.

Strength

Simplest pricing in the category — no provider stack to manage.

Weakness

Closed stack — no BYOK path to cheaper models. Indian-language quality limited.

Full ThinnestAI vs Bland comparison

Retell AI

Unbundled per-component pricing — $0.07–$0.31/min depending on your provider picks.

Pricing

$0.055/min Retell infra + STT + LLM + TTS + telephony. Mid-stack ≈ $0.18/min.

Strength

Most transparent component-level pricing. Cheapest if you pick budget providers (Gemini Flash + cheap TTS).

Weakness

USD billing, no GST invoice. Indic-language production quality is not advertised.

Full ThinnestAI vs Retell comparison

Vapi

$0.05/min platform fee plus BYOK provider pass-through. Typical all-in ≈ $0.25/min.

Pricing

$0.05/min platform + BYOK. Typical all-in $0.25–$0.33/min (₹20–28/min).

Strength

Largest global developer community and template library.

Weakness

3x ThinnestAI's flat rate, USD billing, no native Indian phone procurement.

Full ThinnestAI vs Vapi comparison

OpenAI Realtime

Premium GPT-4o native audio — ~$0.27/min blended, most expensive option.

Pricing

~$0.27/min blended for gpt-4o-realtime-preview audio in+out (~₹22/min). gpt-4o-mini-realtime is cheaper.

Strength

Best English voice quality and reasoning. No stitching overhead.

Weakness

Most expensive in the category. No BYOK. English-first.

Full ThinnestAI vs OpenAI comparison

Try the #1 for yourself

60 seconds, no signup. Talk to a live ThinnestAI voice agent in your language of choice.

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FAQ

Frequently asked questions

What's the actual cheapest voice AI platform in India?

For Indian-language workloads, ThinnestAI wins on all-in cost per minute because of the flat rate — ₹2/min on standard voices, ₹2.5/min on premium voices, telephony included either way — with no separate provider bills. For English-only workloads with simple flows, Bland AI's bundled $0.11/min is very competitive.

Why isn't 'cheapest' always the right choice?

Per-minute cost is only half the equation. If a cheap platform doesn't support Hindi well and your buyers are Hindi-speaking, you'll lose more money on poor conversion than you save on per-minute cost. Always optimize for cost per successful outcome, not just cost per minute.

Do any of these have truly free tiers?

ThinnestAI has a free trial — 25 voice minutes, 200 chat replies — with platform-managed Sarvam on the free tier, no API keys required to start. Vapi and Retell have free signup credits. OpenAI Realtime and Bland are pay-per-use from the first call.

How should I model my real cost?

Pick your highest-volume workload (e.g. 100K minutes/month of Hindi collections). Take the platform's public all-in rate and multiply. Add GST if you're Indian-business-registered and the vendor doesn't issue GST invoices (that's effectively 18% you can't recover). The winner is usually obvious.