How to pronounce Kokoro

Kokoro is most commonly pronounced "koh koh roh" (/ˈkoʊkoʊroʊ/). This is the widely-used reading among engineers, though edge cases exist.

Kokoro is the viral 82M-parameter, Apache-2.0 open-weight TTS model released in 2025 by hexgrad; the name is the Japanese word 心, meaning 'heart'/'spirit'. The even, flat-vowel KOH-koh-roh — matching the original Japanese 心 (ko-ko-ro) — is how practitioners actually say it, and is used here as the primary. The creator's model-card quickstart phonemizes it /kˈOkəɹO/ (Misaki notation, capital O = /oʊ/) = KOH-kuh-roh, with a reduced middle vowel — kept as the cited alternate. Non-native devs commonly stress the middle and add an 'or' vowel ('ko-KOR-oh'), which is wrong; stress stays light and front. Model card verified 2026-07: 82M params, Apache 2.0, name meaning, and the /kˈOkəɹO/ phonemization all present.

Alternate readings you might hear:

• "koh kuh roh" /ˈkoʊkəroʊ/

Source: hexgrad — Kokoro-82M model card (Hugging Face)

Pronouncing project and product names correctly avoids the small but persistent friction of being gently corrected during standups, conference Q&As, and team calls. Hearing the word a few times locks in the right reading better than reading IPA ever will. Pronounce is a community-maintained dictionary — every entry tagged with a confidence level and (where possible) a citable source.