ThinnestAI,
honestly compared

OpenAI's end-to-end voice model (gpt-4o-realtime) with native audio in and out over WebRTC.

A global, SF-based voice AI orchestration platform that stitches STT + LLM + TTS + telephony into a voice agent. YC W21, Bessemer-backed.

YC-backed, dev-first voice agent platform known for unbundled per-component pricing and strong testing/simulation tooling.

Series A outbound-first voice AI platform from SF, known for bundled 'connected minute' pricing and a mature Pathways flow builder.

Open-source Python framework from Daily.co for real-time voice and multimodal AI agents. Pipeline-based composition of STT, LLM, TTS and tools. Self-hosted; Daily.co offers managed transport.

NVIDIA- and Kleiner-backed state-space TTS company, now offering a Line voice agent SDK. Sonic-3 is among the fastest production TTS models (~90ms TTFA).

India's sovereign AI platform — foundation models (Sarvam LLMs), Indic speech (Bulbul TTS, Saaras STT), and a managed conversational agent product (Samvaad). IndiaAI Mission selected.

Bengaluru-based enterprise voice AI company behind Inya VoiceOS (14B speech-to-speech model) and the Assist365 / Automate365 contact-center suite. Series B April 2026.

Bengaluru-based support automation platform across voice and chat, with 10+ Indian languages and an 80+ language footprint. Founded 2017, ~$15.3M raised.

Bengaluru-based cloud telephony and virtual operator serving 7,000+ Indian businesses. Deep +91 carrier relationships, SIP trunking, IVR, contact center.

Cloud telephony with voice assistants, acquired by Gupshup for ~$100M in Feb 2022. Now folded into Gupshup's omnichannel CX and ACE LLM stack.

Hyderabad-based AI-powered cloud contact center on top of the KooKoo CPaaS. Strong India carrier relationships, 3,000+ developer community around KooKoo APIs.

Global enterprise conversational AI platform for voice + chat + email + WhatsApp across 85+ countries. 1,300+ enterprise customers. Gartner Challenger.

Jio Platforms-owned conversational AI company. Chat-first (WhatsApp Business API is their core strength), with a newer voice-agent push for Indian SMBs and enterprises.

Enterprise agentic AI platform with Fortune 2000 customers — $234M raised across 8 rounds, widely mentioned as an IPO candidate. US-HQ, large India engineering presence.

A WhatsApp marketing and support platform, sold on unlimited users with automation priced as add-ons.

An end-to-end WhatsApp API platform sold in seat-based tiers, with a shared team inbox and chatbot builder.

A WhatsApp marketing platform sold in tiers by subscriber count, with an AI agent metered in tokens.