ThinnestAI vs Retell AI
Retell publishes the cleanest unbundled voice AI pricing in the industry. Here's how ThinnestAI's flat ₹1.5/min stacks up for Indian teams.
- Retell's all-in per-minute cost is $0.07–$0.31 depending on the LLM and TTS you pick. ThinnestAI lands at ₹3–4/min all-in with the ThinnestAI Stack (curated LLMs for intelligence and low latency + Sarvam v2 TTS and STT).
- Retell has no documented India presence — no INR billing, no GST, no Indic-tuned voice routing, no DLT-compliant phone numbers.
- Retell wins on simulation tooling and SOC 2 / HIPAA compliance for US teams. ThinnestAI wins on Indian-language production quality and local phone ops.
Real pricing math, three volume tiers
Retell's public rate card shows $0.07 (Gemini Flash Lite) to $0.31/min (Claude 4.5 Sonnet). We use a mid-point of $0.18/min for a production-grade stack. ThinnestAI uses ₹1.5/min platform fee plus the ThinnestAI Stack landing at ₹3–4/min all-in. Converted at ₹83/$.
Pricing sourced from public rate cards as of April 2026. Your actual costs depend on prompt length, output tokens, provider choice, and BYOK status. Verify current rates on each vendor's pricing page before committing.
Feature-by-feature comparison
| Feature | ThinnestAI | Retell AI |
|---|---|---|
| Platform model | Flat ₹1.5/min + BYOK | Unbundled per-component |
| INR / GST billing | Yes | No — USD only |
| Indian phone numbers | Native Twilio + Vobiz BYOK, DLT-compliant | BYO Twilio, DIY compliance |
| No-code flow editor | Yes | Yes — Conversation Flow |
| Indic-tuned voice routing | Opinionated routing across Indic providers | Not advertised, English-first |
| SOC 2 / HIPAA | Enterprise tier | Yes — production-ready |
| Call simulation / testing | Basic | Best-in-class simulation tooling |
You are a US support/sales team
- Your audience is English-speaking.
- You need SOC 2 and HIPAA certification for regulated US buyers.
- You want Retell's industry-leading call simulation and testing tools.
- Unbundled billing transparency is more valuable to you than a flat platform fee.
You are building for Bharat
- You serve Hindi, Marathi, Tamil, Telugu or any Indian-language audience.
- You need INR billing and GST-compliant tax invoices, not USD Stripe charges.
- You want native Indian phone number procurement (DLT-compliant via Vobiz / Twilio BYOK).
- You want to bring your own LLM / STT / TTS and mix providers per agent.
- A flat ₹1.5/min platform fee beats per-provider stacking for cost predictability.
Frequently asked questions
Is ThinnestAI cheaper than Retell AI?
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At a typical production stack (mid-cost LLM + standard TTS + phone), Retell lands around $0.18/min (≈ ₹15/min). ThinnestAI lands at ₹3–4/min all-in with the ThinnestAI Stack. So roughly 75% cheaper.
Does Retell support Hindi and other Indian languages?
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Retell does not advertise production Indian-language support on its pricing or product pages. Quality depends entirely on which STT/TTS you wire in. ThinnestAI has opinionated Indian-language routing across 22 languages via Sarvam, Deepgram, ElevenLabs and other providers.
When should I pick Retell over ThinnestAI?
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Pick Retell if you are a US support or sales team building English call automation where SOC 2/HIPAA is a hard requirement and call simulation tooling matters more than Indic language quality or INR billing.
Does ThinnestAI support BYOK the same way Retell does?
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Yes. ThinnestAI supports BYOK for LLMs (OpenAI, Anthropic, Groq, Gemini, Sarvam), STT (Deepgram, Sarvam, AssemblyAI) and TTS (ElevenLabs, Cartesia, Sarvam). You can mix and match per agent.
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