ThinnestAI vs OpenAI Realtime
An honest side-by-side for teams picking a voice AI stack in 2026. Real pricing math at three volume tiers, full feature matrix, and when each platform is actually the right choice.
- ThinnestAI is roughly 70% cheaper at the same per-minute volume when you bring your own providers (e.g. Groq + Deepgram + ElevenLabs).
- 22 Indian languages supported natively via provider routing — Hindi, Marathi, Tamil, Telugu, Bengali and more. OpenAI Realtime is English-centric.
- Choose OpenAI Realtime if you need GPT-4o native audio reasoning and your users are primarily English-speaking.
Real pricing math, three volume tiers
Based on OpenAI Realtime's public blended rate of ~$0.27/min for gpt-4o-realtime-preview audio in+out, and the ThinnestAI Stack (₹1.5/min platform fee plus curated LLMs for intelligence and low latency, Sarvam v2 TTS and STT — ₹3–4/min all-in). Converted at ₹83/$.
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 | OpenAI Realtime |
|---|---|---|
| Platform cost per minute | ₹3–4/min (~$0.04) all-in with the ThinnestAI Stack | ≈ ₹22 (~$0.27) |
| Indian languages supported | 22 (Hindi, Marathi, Tamil, Telugu, Bengali…) | Limited — English-centric |
| LLM choice | Bring your own — GPT-4o, Claude, Groq GPT-OSS, Gemini, Sarvam | GPT-4o native audio model only |
| STT / TTS choice | BYOK — Deepgram, AssemblyAI, ElevenLabs, Cartesia, Sarvam | Bundled inside GPT-4o realtime |
| Phone / SIP integration | Native LiveKit + Twilio + Vobiz BYOK | Requires third-party glue (Twilio, Telnyx, etc.) |
| No-code flow editor | Yes — drag-and-drop | No — SDK / API only |
| INR billing / GST invoice | Yes — billed in INR with GST invoice | USD only |
| Self-serve free trial | Free trial with welcome credits, no card | Pay-per-use from first call |
You need GPT-4o native audio
- Your users are primarily English-speaking.
- You need GPT-4o's native audio reasoning for complex dialogue.
- Per-minute cost is not a primary constraint.
- You prefer one vendor for LLM, STT and TTS rather than composing providers.
- Premium consumer voice products where quality trumps unit economics.
You need Indian-language voice at scale
- You serve Hindi, Marathi, Tamil, Telugu or any Indian-language audience.
- Unit economics matter — collections, tele-health, edtech, BPO.
- You need phone / SIP integration natively, not via third-party glue.
- You want to mix providers per agent based on language, latency, or cost.
- A no-code flow editor beats writing voice loops by hand.
Frequently asked questions
Is ThinnestAI really cheaper than OpenAI Realtime?
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Yes. OpenAI Realtime costs roughly $0.24–$0.30 per minute of audio in/out blended. ThinnestAI's pay-as-you-go tier is ₹1.5/minute platform fee plus provider pass-through — the ThinnestAI Stack (curated LLMs for intelligence and low latency, plus Sarvam v2 TTS and STT) comes to ₹3–4/minute all-in (about $0.04), roughly 85% cheaper at the same volume.
Does ThinnestAI support Hindi and other Indian languages?
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Yes. ThinnestAI routes Indian-language workloads to providers that handle them well — Deepgram Nova-2 and Sarvam for STT, ElevenLabs Multilingual and Sarvam for TTS, Groq GPT-OSS and Sarvam for LLM. All 22 scheduled Indian languages are supported at varying production-readiness levels, with Hindi, Marathi, Tamil, Telugu, Bengali and Gujarati being the most mature.
When should I choose OpenAI Realtime over ThinnestAI?
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Pick OpenAI Realtime if you need GPT-4o-class reasoning inside the voice loop, your audience is primarily English-speaking, and per-minute cost is not a primary constraint. It's an excellent choice for premium English consumer voice products where quality matters more than unit economics.
Can I bring my own LLM / STT / TTS to ThinnestAI?
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Yes. ThinnestAI supports BYOK for LLMs (OpenAI, Anthropic, Groq, Gemini, Sarvam and more), STT (Deepgram, AssemblyAI, Sarvam) and TTS (ElevenLabs, Cartesia, Sarvam). You can mix and match providers per agent, or switch providers per language within the same agent.
Does ThinnestAI handle phone calls natively?
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Yes. ThinnestAI is built on LiveKit with native SIP integration and supports Twilio as well as Vobiz BYOK for Indian phone number procurement. OpenAI Realtime requires you to wire up a separate telephony provider yourself.
Try ThinnestAI free
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