Lightning v3.1

July 3, 2026

Lightning v3.1 Pro goes multilingual — 27 new languages, 149 new voices

Lightning v3.1 Pro now supports 27 additional languages beyond English + Hindi, with 149 new premium voices live on prod:

  • 9 Indian languages (67 voices) — Marathi, Tamil, Malayalam, Telugu, Kannada, Punjabi, Bengali, Odia, Gujarati
  • 8 Asian & Middle Eastern languages (21 voices) — Arabic, Chinese (Mandarin), Indonesian, Japanese, Korean, Malay, Turkish, Vietnamese
  • 10 European languages (61 voices) — German, Spanish, French, Italian, Portuguese (Brazilian + European), Russian, Greek, Finnish, Norwegian, Polish

Pass the ISO 639-1 code in the language body parameter and pair it with a Pro voice from that language:

$curl -X POST "https://api.smallest.ai/waves/v1/tts" \
>  -H "Authorization: Bearer $SMALLEST_API_KEY" \
>  -H "Accept: audio/wav" \
>  -d '{"text": "வணக்கம்!", "voice_id": "malar", "model": "lightning_v3.1_pro", "language": "ta", "sample_rate": 24000}'

What’s in this release:

  • Each language has its own dedicated Pro voices — see the Lightning v3.1 Pro voice catalog for the full per-language list with voice IDs and genders.
  • language: en, language: hi, and the omit-language default (en + hi) behave exactly as before.
  • The full updated voice list is available via the Get Voices endpoint.

Migration: no action — additive change, existing voices and language behaviour unchanged.