Soniox Speech-to-Text AI

Soniox Speech-to-Text AI is an AI transcriber tool. Soniox is a speech AI API covering realtime speech-to-text, text-to-speech and speech translation in 60+ languages and 3,600 language pairs. It targets developers building voice agents, call analytics, meeting transcription and multilingual products, with a focus on language switching, alphanumeric accuracy and low-latency streaming.

Soniox is a speech AI platform delivered primarily as an API layer for voice products. Its core is a realtime speech-to-text engine that handles 60+ languages with what the company describes as native-speaker accuracy, including multilingual conversations where speakers switch languages mid-sentence, multi-speaker dialogue, alphanumeric strings and domain-specific vocabulary. The same platform adds text-to-speech and speech translation, so transcription, synthesis and translation can be wired into a product through one unified interface rather than three separate vendors. The transcription side is aimed at live use rather than batch cleanup. Soniox emphasizes low-latency streaming, meaning text appears as speech is spoken and audio generation can begin from the first few words instead of waiting for a complete sentence. Translation covers 3,600 language pairs and is built for code-switching environments, which matters for contact centers, conferencing tools and voice agents serving mixed-language callers. Text-to-speech rounds this out with expressive output, audio tags for delivery control, instant voice cloning and language switching inside a single utterance. In practice the buyer is a developer or product team building voice infrastructure: realtime meeting transcription, call analytics, voice assistants, dubbing, or a translation layer on top of an existing app. Setup happens at the API level, so evaluation means reading the speech-to-text docs, sending test audio through streaming endpoints and comparing accuracy on your own accents and jargon. The company lists LiveKit, Pipecat, Agora, Vapi, Retell AI, Fireflies.ai, Samsung, LG, Truecaller and Zomato among teams using its models, which suggests it competes on multilingual accuracy rather than on an end-user app. That positioning is the main distinction from consumer transcription services. Soniox does not present itself as a destination for someone who wants to upload a file and get a formatted summary; it is the engine underneath products like that. Teams that already have an app, or are building one, get broad language coverage and streaming behavior from a single provider. Teams looking for a ready-made note-taking interface, built-in speaker-labeled exports or team collaboration features will need to build or buy those elsewhere.