Inworld Realtime TTS 2

Inworld TTS 1.5 Max

Inworld flagship TTS model with the best balance of quality and speed, plus enhanced alignment data.

Inworld TTS 1.5 Mini

Inworld ultra-fast, cost-efficient TTS model optimized for low latency with enhanced alignment data.

Qwen Audio 3.1 TTS Plus

High-quality multilingual speech synthesis for narration, dubbing, brand voices, and character performance. Four preset voices support instruction-guided emotion, tone, and persona, plus SSML and expressive tags. Returns MP3, WAV, or PCM audio after generation completes. Optional API word timestamps return JSON with base64 audio. Billed by measured characters. NanoGPT accepts up to 20,000 characters per request; this is a transport limit.

Voxtral TTS 3

Generate multilingual speech with preset voices or a per-request MP3 or WAV voice reference. Supports inline emotion and pace tags, pronunciation hints, and MP3, WAV, PCM, FLAC, or Opus output. Up to 4,000 input characters; returns completed audio.

Kotoba TTS v2

Japanese speech synthesis with male-01 and female-01 preset voices. Returns completed 24 kHz mono WAV audio. Billed by exact UTF-8 bytes, not characters. NanoGPT accepts up to 12,000 input bytes.

Qwen Audio 3.1 TTS Flash

Speech synthesis with four multilingual voices in Singapore. Supports Japanese, Korean, French, German, Portuguese, Italian, Vietnamese, and Indonesian, plus eight Chinese dialects. Returns MP3, WAV, or PCM audio after generation completes. Billed by measured input and output tokens; character-based previews are estimates.