# Soniox STT v6 adds agent text input and echo filtering for voice agents

Digest AI · Agents & Tools · published 2026-11-03T20:18:22Z

Canonical: https://digestai.news/story/soniox-stt-v6-adds-agent-text-input-and-echo-filtering-for-voice-agent

## Summary

Soniox released **Soniox STT v6**, an updated speech-to-text API that transcribes both caller and agent speech in real time. The model uses agent text input to recognize short replies and filter out echo from the agent’s voice, improving accuracy in cascaded voice-agent systems. It ships as **stt-rt-v6** (streaming) and **stt-async-v6** (file-based), supporting 60+ languages via Soniox’s cloud API only. Pricing is $0.12/hour for streaming and $0.10/hour for async, with diarization and language ID included. Agent text input costs $4.00 per 1M tokens for real-time use, billed separately.

Soniox claims **v6 is significantly more accurate** than its predecessor but has not published benchmark results yet. The company cites **v5’s 1.34% semantic WER** on Pipecat, trailing **Azure’s 1.21% mean WER** but with faster latency. **v5 models will be deprecated December 15, 2026**, with automatic routing to v6. The update also improves handling of numbers, commands, accents, and language switching. Soniox positions **v6 as the first model to filter echo using agent text**, though **AssemblyAI’s Universal-3.5 Pro Realtime** also supports agent context in streaming STT.

## Key points

- Soniox STT v6 transcribes both caller and agent speech in real time via **stt-rt-v6** (streaming) and **stt-async-v6** (file-based)
- Agent text input enables echo filtering by feeding the agent’s spoken words to the model, improving accuracy in voice-agent calls
- Pricing starts at **$0.12/hour for streaming** and **$0.10/hour for async**, with agent text input billed at **$4.00 per 1M tokens**

## Why it matters

Voice agents rely on accurate speech-to-text to handle caller input and agent responses. Soniox’s echo filtering and agent text input reduce errors in real-time transcription, which could improve call quality for businesses using automated customer service systems.

## Sources

1. [Soniox STT v6 Adds Agent Text Input and Echo Filtering for Voice Agents](https://marktechpost.com/2026/11/03/soniox-stt-v6-agent-text-input-echo-cancellation) (MarkTechPost, 2026-11-03)

## Cite

Digest AI, "Soniox STT v6 adds agent text input and echo filtering for voice agents", 3 November 2026, https://digestai.news/story/soniox-stt-v6-adds-agent-text-input-and-echo-filtering-for-voice-agent

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