The Cheapest Voice AI API in 2026: A Developer's Pricing Breakdown
You want the cheapest voice AI. So do I.
Table of Contents▼
Published: January 19, 2026 Updated: January 19, 2026 Reading time: 11 minutes
You want the cheapest voice AI. So do I.
I spent three weeks building a voice agent prototype last month. The technology worked great. Then I calculated my projected monthly costs at scale and nearly closed my laptop forever.
Voice AI pricing is a maze. Platform fees, LLM costs, TTS charges, STT fees, telephony rates, hidden markups. Every vendor structures it differently. Some bundle costs. Others itemize everything. A few bury the expensive parts in footnotes.
This guide cuts through the noise. I'll show you exactly what voice AI costs in 2026, compare every major platform's actual pricing (not their marketing claims), and help you find the genuinely cheapest option for your use case.
No affiliate links. No sponsored content. Just the numbers.
Table of Contents
- How Voice AI Pricing Actually Works
- Platform Fee Comparison (Verified)
- The Real Cost: Total Cost of Ownership
- The BYO Keys Advantage
- Hidden Costs That Will Surprise You
- Cost Calculator Tables
- Which Platform Is Actually Cheapest?
- FAQ
How Voice AI Pricing Actually Works
Before comparing platforms, you need to understand the five cost components that make up every voice AI bill.
1. Platform Fee (The Headline Number)
This is what vendors advertise. It's the orchestration charge for managing real-time conversations, handling interruptions, routing audio, and maintaining WebSocket connections.
Industry range: $0.03/min to $0.15/min
2. Speech-to-Text (STT)
Converting your user's spoken words into text. Charged per minute of audio processed.
| Provider | Model | Cost |
|---|---|---|
| Deepgram | Nova 2 | $0.0043/min |
| Deepgram | Nova 3 | $0.0059/min |
| Google Speech | Standard | $0.016/min |
| Azure Speech | Standard | $0.016/min |
3. Large Language Model (LLM)
The AI brain processing the conversation. Charged per token (roughly 4 characters = 1 token).
| Provider | Model | Input (per 1M tokens) | Output (per 1M tokens) |
|---|---|---|---|
| OpenAI | GPT-4o | $2.50 | $10.00 |
| OpenAI | GPT-4o-mini | $0.15 | $0.60 |
| Anthropic | Claude 3.5 Sonnet | $3.00 | $15.00 |
| Gemini 1.5 Flash | $0.075 | $0.30 | |
| Groq | Llama 3.1 70B | $0.59 | $0.79 |
4. Text-to-Speech (TTS)
Converting the AI's response back into audio. Charged per character.
| Provider | Model | Cost per 1K chars |
|---|---|---|
| ElevenLabs | Turbo v2.5 | $0.18 |
| Deepgram | Aura | $0.015 |
| OpenAI | TTS-1 | $0.015 |
| Cartesia | Sonic | $0.08 |
5. Telephony
The actual phone call charges. Most people forget this one.
| Provider | Inbound | Outbound |
|---|---|---|
| Twilio | $0.0085/min | $0.014/min |
| Telnyx | $0.006/min | $0.008/min |
Key insight: The platform fee is often the smallest component. A $0.05/min platform fee can easily balloon to $0.15/min total when you add LLM, TTS, STT, and telephony.
Platform Fee Comparison (Verified)
Here's what each major voice AI platform charges as their base platform fee. These numbers are verified from official pricing pages as of January 2026.
| Platform | Platform Fee | Minimum Commitment | BYO Keys |
|---|---|---|---|
| Burki | $0.03/min | None | Yes |
| Vapi | $0.05/min | None | No |
| Retell AI | $0.07/min | None | Limited |
| Synthflow | $0.08/min | Subscription | No |
| Bland AI | $0.09/min | None | No |
| RevRing | $0.03/min | 10,000 minutes | Limited |
Important Notes on These Numbers
Burki offers the lowest platform fee at $0.03/min with no minimum commitment. You can use one minute or one million minutes at the same rate. No credit card required to start with 200 free minutes.
RevRing matches Burki's $0.03/min rate, but there's a catch: you must purchase 10,000 minutes upfront ($300 minimum). For startups testing ideas or agencies exploring use cases, this bulk requirement creates a significant barrier.
Vapi charges $0.05/min, which is 67% higher than Burki. Without BYO key support, you also pay Vapi's markup on all provider costs.
Retell AI at $0.07/min is 133% higher than Burki. Their marketing often highlights "starting at $0.07/min," but total costs can reach $0.31/min when you stack LLM, telephony, and other fees.
Bland AI at $0.09/min is the most expensive in per-minute platform fees, though they offer self-hosted options for teams willing to manage infrastructure.
The Real Cost: Total Cost of Ownership
Platform fees are marketing numbers. Total cost of ownership is what hits your bank account.
Let's calculate real costs for a typical voice AI configuration:
Configuration assumptions:
- LLM: GPT-4o-mini ($0.003/min estimated usage)
- STT: Deepgram Nova 2 ($0.0043/min)
- TTS: Deepgram Aura ($0.003/min based on average character output)
- Telephony: Telnyx inbound ($0.006/min)
1,000 Minutes/Month (Small Business)
| Platform | Platform Fee | Provider Costs | Markup Est. | Total Monthly |
|---|---|---|---|---|
| Burki (BYO) | $30.00 | $16.30 | $0.00 | $46.30 |
| Vapi | $50.00 | $16.30 | ~$4.90 | $71.20 |
| Retell | $70.00 | $16.30 | ~$4.90 | $91.20 |
| Bland | $90.00 | $16.30 | ~$4.90 | $111.20 |
Burki saves: 35% vs Vapi, 49% vs Retell, 58% vs Bland
10,000 Minutes/Month (Growing Startup)
| Platform | Platform Fee | Provider Costs | Markup Est. | Total Monthly |
|---|---|---|---|---|
| Burki (BYO) | $300.00 | $163.00 | $0.00 | $463.00 |
| Vapi | $500.00 | $163.00 | ~$48.90 | $711.90 |
| Retell | $700.00 | $163.00 | ~$48.90 | $911.90 |
| Bland | $900.00 | $163.00 | ~$48.90 | $1,111.90 |
Annual savings with Burki: $2,987 vs Vapi, $5,387 vs Retell, $7,787 vs Bland
100,000 Minutes/Month (Enterprise Scale)
| Platform | Platform Fee | Provider Costs | Markup Est. | Total Monthly |
|---|---|---|---|---|
| Burki (BYO) | $3,000 | $1,630 | $0.00 | $4,630 |
| Vapi | $5,000 | $1,630 | ~$489 | $7,119 |
| Retell | $7,000 | $1,630 | ~$489 | $9,119 |
| Bland | $9,000 | $1,630 | ~$489 | $11,119 |
Annual savings with Burki: $29,868 vs Vapi, $53,868 vs Retell, $77,868 vs Bland
At 100,000 minutes monthly, choosing the cheapest voice AI platform saves you $30,000-$78,000 per year. That's real money.
The BYO Keys Advantage
The single biggest factor in finding the cheapest voice AI is whether the platform supports Bring Your Own (BYO) API keys.
Without BYO (Most Platforms)
Your Bill = Platform Fee + (Provider Costs x Platform Markup)You pay whatever the platform charges for LLM, TTS, and STT. You have no visibility into actual costs. You can't negotiate directly with providers. As your volume grows, you can't leverage your usage for better rates.
Typical platform markups: 15-40% on provider costs
With BYO (Burki)
Your Bill = Platform Fee + Direct Provider CostsYou bring your own API keys for:
- OpenAI, Anthropic, Google, xAI, Groq (LLM)
- ElevenLabs, Deepgram, Cartesia, OpenAI (TTS)
- Deepgram Nova 2/3 (STT)
- Twilio, Telnyx, Vonage (telephony)
Benefits of BYO mode:
- Direct pricing relationships - Negotiate enterprise rates as you scale
- Existing discounts apply - Your OpenAI committed use tier counts
- Provider flexibility - Switch providers without platform lock-in
- Cost transparency - See exactly what each component costs
- Prepaid credits work - Use existing balances with providers
Real example: A company with 50,000 minutes/month and an OpenAI enterprise agreement saves an additional $200-400/month by using their negotiated rates instead of platform-mediated pricing.
Hidden Costs That Will Surprise You
The cheapest voice AI on paper isn't always cheapest in practice. Watch for these hidden costs:
1. HIPAA/BAA Fees
Healthcare companies need Business Associate Agreements for compliance. Many platforms charge $500-2,000/month extra.
- Vapi: HIPAA BAA requires Enterprise tier (contact sales)
- Retell: Enterprise tier only
- Burki: HIPAA compliance and BAA included at no extra cost
For a healthcare startup at 10,000 minutes/month, HIPAA fees alone can double your effective costs.
2. Provider Markup (The Silent Killer)
Without BYO support, platforms add 15-40% on all provider costs. Over a year, this markup often exceeds the platform fee itself.
Example at 10,000 min/month:
- Direct provider costs: $163/month
- With 30% markup: $212/month
- Annual markup cost: $588
3. Support Tier Fees
"Enterprise support" sounds nice until you see the $1,000-5,000/month price tag. Check what's included in base pricing before you need help.
4. Minimum Commitments
RevRing's $0.03/min sounds great until you realize you need to buy 10,000 minutes upfront. That's $300 committed before you've validated your use case.
Burki: No minimums. Use 10 minutes or 10 million minutes at $0.03/min.
5. Phone Number Fees
Monthly fees per phone number range from $1-10. Some platforms include numbers; others don't.
- Burki: Free phone number for 30 days, then $2/month
- Vapi: $2-5/month depending on type
- Some enterprise platforms: $10+/month per number
6. Recording Storage
Call recordings accumulate fast. Some platforms charge for storage beyond basic limits. A 10,000 minute/month operation generates roughly 20GB of audio monthly.
7. Compliance Add-Ons
PCI, GDPR, SOC 2 documentation, audit logs. Some platforms charge separately for each compliance feature.
Burki: SOC 2 Type II certified, HIPAA compliant, GDPR ready - all included.
Cost Calculator Tables
Use these tables to estimate your monthly costs based on volume.
Cheapest Configuration (Cost-Optimized)
Using: GPT-4o-mini, Deepgram Aura TTS, Deepgram Nova 2 STT, Telnyx telephony
| Monthly Minutes | Burki (BYO) | Vapi | Retell | Bland |
|---|---|---|---|---|
| 500 | $23 | $36 | $46 | $56 |
| 1,000 | $46 | $71 | $91 | $111 |
| 2,500 | $116 | $178 | $228 | $278 |
| 5,000 | $232 | $356 | $456 | $556 |
| 10,000 | $463 | $712 | $912 | $1,112 |
| 25,000 | $1,158 | $1,780 | $2,280 | $2,780 |
| 50,000 | $2,315 | $3,560 | $4,560 | $5,560 |
| 100,000 | $4,630 | $7,119 | $9,119 | $11,119 |
Premium Configuration (Quality-Optimized)
Using: GPT-4o, ElevenLabs TTS, Deepgram Nova 3 STT, Twilio telephony
| Monthly Minutes | Burki (BYO) | Vapi | Retell | Bland |
|---|---|---|---|---|
| 500 | $41 | $58 | $68 | $78 |
| 1,000 | $82 | $117 | $137 | $157 |
| 2,500 | $205 | $291 | $341 | $391 |
| 5,000 | $410 | $583 | $683 | $783 |
| 10,000 | $820 | $1,165 | $1,365 | $1,565 |
| 25,000 | $2,050 | $2,913 | $3,413 | $3,913 |
| 50,000 | $4,100 | $5,825 | $6,825 | $7,825 |
| 100,000 | $8,200 | $11,650 | $13,650 | $15,650 |
Annual Cost Comparison (10,000 min/month, cost-optimized)
| Platform | Monthly | Annual | vs. Cheapest |
|---|---|---|---|
| Burki | $463 | $5,556 | Baseline |
| Vapi | $712 | $8,544 | +$2,988 (54%) |
| Retell | $912 | $10,944 | +$5,388 (97%) |
| Bland | $1,112 | $13,344 | +$7,788 (140%) |
Which Platform Is Actually Cheapest?
Based on verified pricing and total cost analysis:
Cheapest Overall: Burki
Platform fee: $0.03/min (lowest with no minimums) BYO support: Full (LLM, TTS, STT, telephony) Free trial: 200 minutes + free phone number for 30 days HIPAA/BAA: Included at no extra cost Minimum commitment: None
Burki is 40% cheaper than Vapi on platform fees alone. With BYO mode eliminating provider markups, the savings compound further.
Cheapest at High Volume (If You're Committed): RevRing
Platform fee: $0.03/min Minimum: 10,000 minutes ($300 upfront)
RevRing matches Burki's rate but requires bulk purchase. If you're certain you'll use 10,000+ minutes monthly, it's competitive. But for testing, validation, or variable workloads, the minimum commitment is a barrier.
What About Free Tiers?
- Burki: 200 free minutes, no credit card required
- Vapi: $10 in credits (~100-200 minutes depending on usage)
- Retell: Limited free trial
- Bland: Limited free trial
Burki's free tier is the most generous for real testing.
FAQ
What's the absolute cheapest voice AI in 2026?
Burki at $0.03/min platform fee with no minimum commitment. Using BYO mode with cost-optimized providers (GPT-4o-mini, Deepgram Aura, Deepgram Nova 2, Telnyx), total costs run approximately $0.046/min all-in.
How much does a voice AI call actually cost?
A typical 3-minute call costs $0.14-0.45 depending on your platform and configuration. With Burki's cheapest configuration, a 3-minute call costs about $0.14. With premium providers on expensive platforms, the same call costs $0.45+.
Is there a free voice AI option?
Truly free? Not for production use. But Burki offers 200 free minutes with no credit card required, which is enough to build and test a complete prototype before committing any budget.
Why don't all platforms offer BYO keys?
Provider markup is a significant revenue stream for voice AI platforms. Some platforms choose higher platform fees plus BYO support (like Burki). Others choose lower-looking platform fees but capture margin through mandatory provider billing (like Vapi).
Can I reduce costs by self-hosting?
Yes, but the complexity is significant. Self-hosted voice AI requires managing real-time audio streaming, STT/TTS provider integrations, LLM orchestration, telephony SIP trunks, and scaling infrastructure. Most teams find that even "expensive" platforms cost less than dedicated DevOps for self-hosting.
What's the cheapest TTS provider?
Deepgram Aura at $0.015 per 1,000 characters. OpenAI TTS-1 is similarly priced. ElevenLabs costs ~12x more but offers better voice quality and cloning capabilities.
What's the cheapest LLM for voice AI?
Groq with Llama 3.1 70B offers excellent price-performance. Google Gemini 1.5 Flash is also very cost-effective. For most voice AI use cases, GPT-4o-mini provides the best balance of capability and cost.
Do I need HIPAA compliance?
If you're handling protected health information (PHI) in healthcare, insurance, or related industries, yes. HIPAA compliance costs $500-2,000/month extra on most platforms. Burki includes it free.
How do I migrate from an expensive platform?
Most voice AI platforms use similar architectures. Your prompts, integrations, and phone numbers can typically transfer. Burki uses OpenAI-compatible formats for easier migration. The main work is updating API endpoints and authentication.
What hidden costs should I watch for?
- Provider markups (15-40% without BYO)
- HIPAA/BAA fees ($500-2,000/month)
- Support tier fees ($1,000-5,000/month)
- Minimum commitments ($300+ upfront)
- Recording storage overages
- Phone number fees
The Bottom Line
Finding the cheapest voice AI requires looking beyond platform fees. Total cost includes LLM, TTS, STT, telephony, compliance fees, and hidden markups.
The data shows:
- Lowest platform fee (no minimums): Burki at $0.03/min
- Lowest total cost of ownership: Burki with BYO mode
- Best free trial: Burki with 200 minutes
- HIPAA included: Burki (most others charge extra)
For a typical 10,000 minutes/month workload, Burki saves $3,000-$7,800 annually compared to alternatives. At enterprise scale (100,000 min/month), savings reach $30,000-$78,000 per year.
Price matters. These are the numbers.
Want to verify these costs for your specific use case?
Start free with 200 minutes - No credit card required. Build your agent, run real calls, and see actual costs before committing.
Pricing data verified January 2026 from official platform documentation. Costs vary based on configuration, conversation length, and provider choices. Burki is SOC 2 Type II certified and HIPAA compliant.
Sources:
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