Use these IDs with izwi tts --speaker, the Text to Speech page, or voice/speaker fields on /v1/audio/speech. Saved and reference voices use --saved-voice-id, reference_audio, or the Voice Studio saved voice library instead of these built-in speaker IDs.

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Model Families

FamilyVoice source
Qwen3 CustomVoiceNine named built-in speakers
Kokoro-82M54 multilingual voice IDs; requires espeak-ng
Voxtral TTS20 bundled preset voices
LFM2.5 AudioFour English regional presets
VibeVoice-1.5BReference voice or saved voice only; no built-in presets
Qwen3 BaseReference voice or saved voice only
Qwen3 VoiceDesignPrompt instructions, then optional saved voice reuse

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Qwen3 CustomVoice

IDDisplay nameLanguageDescription
VivianVivianChineseWarm and expressive female voice
SerenaSerenaEnglishClear and professional female voice
RyanRyanEnglishConfident and friendly male voice
AidenAidenEnglishYoung and energetic male voice
DylanDylanEnglishDeep and authoritative male voice
EricEricEnglishCalm and measured male voice
SoheeSoheeKoreanGentle and melodic female voice
Ono_annaAnnaJapaneseSoft and pleasant female voice
Uncle_fuUncle FuChineseMature and wise male voice
Example: 
izwi tts "Hello from Serena." \
  --model Qwen3-TTS-12Hz-0.6B-CustomVoice \
  --speaker Serena \
  --output serena.wav

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Kokoro-82M

Kokoro voice IDs use a two-letter prefix:
PrefixLanguage/regionGender marker
af, amAmerican Englishfemale / male
bf, bmBritish Englishfemale / male
jf, jmJapanesefemale / male
zf, zmMandarin Chinesefemale / male
ef, emSpanishfemale / male
ffFrenchfemale
hf, hmHindifemale / male
if, imItalianfemale / male
pf, pmBrazilian Portuguesefemale / male
Available IDs: 
af_alloy, af_aoede, af_bella, af_heart, af_jessica, af_kore,
af_nicole, af_nova, af_river, af_sarah, af_sky, am_adam,
am_echo, am_eric, am_fenrir, am_liam, am_michael, am_onyx,
am_puck, am_santa, bf_alice, bf_emma, bf_isabella, bf_lily,
bm_daniel, bm_fable, bm_george, bm_lewis, ef_dora, em_alex,
em_santa, ff_siwis, hf_alpha, hf_beta, hm_omega, hm_psi,
if_sara, im_nicola, jf_alpha, jf_gongitsune, jf_nezumi,
jf_tebukuro, jm_kumo, pf_dora, pm_alex, pm_santa, zf_xiaobei,
zf_xiaoni, zf_xiaoxiao, zf_xiaoyi, zm_yunjian, zm_yunxi,
zm_yunxia, zm_yunyang
Example: 
izwi tts "Hello from Bella." \
  --model Kokoro-82M \
  --speaker af_bella \
  --output kokoro-bella.wav

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Voxtral TTS

IDVoice
casual_femaleCasual English female
casual_maleCasual English male
cheerful_femaleCheerful English female
neutral_femaleNeutral English female
neutral_maleNeutral English male
pt_male, pt_femalePortuguese male/female
nl_male, nl_femaleDutch male/female
it_male, it_femaleItalian male/female
fr_male, fr_femaleFrench male/female
es_male, es_femaleSpanish male/female
de_male, de_femaleGerman male/female
ar_maleArabic male
hi_male, hi_femaleHindi male/female

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LFM2.5 Audio

IDVoice
US FemaleUS female preset
US MaleUS male preset
UK FemaleUK female preset
UK MaleUK male preset

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See Also