General

The unified TTS endpoints (POST /waves/v1/tts + wss://api.smallest.ai/waves/v1/tts/live) now document the full language surface the platform accepts, matching the product-team lineup for both lightning_v3.1 (base) and lightning_v3.1_pro.

Added to the language enum on both HTTP and WebSocket:

• auto — routes the request internally based on input text. Any English or Hindi voice can be used across all supported languages when auto is set; the platform handles language-appropriate routing without needing an explicit code per call. Recommended for cross-language use cases.
• nl (Dutch) — accepted on both lightning_v3.1 and lightning_v3.1_pro.
• sv (Swedish) — accepted on both lightning_v3.1 and lightning_v3.1_pro.

Updated counts:

• lightning_v3.1 accepts 20 language codes (was documented as 12): 10 European (English, Spanish, French, German, Italian, Dutch, Swedish, Portuguese, Polish, Russian) + 10 Indic (Hindi, Marathi, Gujarati, Punjabi, Bengali, Odia, Tamil, Telugu, Kannada, Malayalam). The trained voice catalog covers 12 of these directly; the remaining 8 route through English or Hindi voices.
• lightning_v3.1_pro accepts 31 language codes (was documented as 29): the 20 above plus 3 additional European (Greek, Finnish, Norwegian) and 8 Asian & Middle Eastern (Chinese, Japanese, Korean, Indonesian, Malay, Vietnamese, Turkish, Arabic).

No breaking changes — existing codes still behave identically. auto, nl, and sv were already accepted by the platform; this update documents them.

The Lightning v3.1 and Lightning v3.1 Pro model cards have the full per-model language breakdown and voice-count tables.