{"benchmark_id":"voice-quality-phase-b-2026-07-24","evaluated_on":"2026-07-24","model":"Kokoro-82M","human_reviewers":1,"candidate_count":18,"automatic_audio_checks":{"passed":126,"total":126},"longform_voice_switches_detected":{"detected":0,"samples":18},"featured_eligible_count":8,"methodology":"/methodology","limitations":["This was an internal quality gate, not a statistically representative external benchmark.","One human reviewer scored the fixed candidate set after automatic audio checks.","English code-switch scores were diagnostic only; Chinese-English mixed speech was a release gate for Chinese candidates.","The listening review used headphones in an ordinary room, not an acoustics laboratory."],"results":[{"voice_id":"af_aoede","name":"Aoede","locale":"en-US","scores":{"naturalness":5,"pronunciation_accuracy":5,"long_sentence_stability":5,"longform_consistency":5,"audio_integrity":5,"code_switch":1},"featured_eligible":true,"recommended_scenes":["course","podcast","article"],"reasons":[]},{"voice_id":"af_bella","name":"Bella","locale":"en-US","scores":{"naturalness":5,"pronunciation_accuracy":5,"long_sentence_stability":5,"longform_consistency":5,"audio_integrity":5,"code_switch":1},"featured_eligible":true,"recommended_scenes":["article","course","podcast"],"reasons":[]},{"voice_id":"af_kore","name":"Kore","locale":"en-US","scores":{"naturalness":5,"pronunciation_accuracy":5,"long_sentence_stability":5,"longform_consistency":5,"audio_integrity":5,"code_switch":1},"featured_eligible":true,"recommended_scenes":["article","course","podcast"],"reasons":[]},{"voice_id":"af_nicole","name":"Nicole","locale":"en-US","scores":{"naturalness":5,"pronunciation_accuracy":5,"long_sentence_stability":5,"longform_consistency":5,"audio_integrity":5,"code_switch":1},"featured_eligible":true,"recommended_scenes":["article","podcast"],"reasons":[]},{"voice_id":"am_fenrir","name":"Fenrir","locale":"en-US","scores":{"naturalness":5,"pronunciation_accuracy":5,"long_sentence_stability":5,"longform_consistency":5,"audio_integrity":5,"code_switch":1},"featured_eligible":true,"recommended_scenes":["podcast","article","course"],"reasons":[]},{"voice_id":"am_michael","name":"Michael","locale":"en-US","scores":{"naturalness":5,"pronunciation_accuracy":5,"long_sentence_stability":5,"longform_consistency":5,"audio_integrity":5,"code_switch":1},"featured_eligible":true,"recommended_scenes":["podcast","video"],"reasons":[]},{"voice_id":"bf_emma","name":"Emma","locale":"en-GB","scores":{"naturalness":5,"pronunciation_accuracy":5,"long_sentence_stability":5,"longform_consistency":5,"audio_integrity":5,"code_switch":1},"featured_eligible":true,"recommended_scenes":["course","article","podcast"],"reasons":[]},{"voice_id":"am_puck","name":"Puck","locale":"en-US","scores":{"naturalness":5,"pronunciation_accuracy":5,"long_sentence_stability":5,"longform_consistency":5,"audio_integrity":5,"code_switch":1},"featured_eligible":false,"recommended_scenes":[],"reasons":["no use-case score reached 4/5"]},{"voice_id":"af_heart","name":"Heart","locale":"en-US","scores":{"naturalness":4,"pronunciation_accuracy":5,"long_sentence_stability":5,"longform_consistency":5,"audio_integrity":5,"code_switch":1},"featured_eligible":true,"recommended_scenes":["article"],"reasons":[]},{"voice_id":"zm_yunjian","name":"Yunjian","locale":"zh-CN","scores":{"naturalness":4,"pronunciation_accuracy":5,"long_sentence_stability":5,"longform_consistency":5,"audio_integrity":5,"code_switch":1},"featured_eligible":false,"recommended_scenes":["article","course"],"reasons":["blocking listening issue","Chinese-English code-switch score below 3/5"]},{"voice_id":"zf_xiaobei","name":"Xiaobei","locale":"zh-CN","scores":{"naturalness":4,"pronunciation_accuracy":4,"long_sentence_stability":4,"longform_consistency":4,"audio_integrity":4,"code_switch":1},"featured_eligible":false,"recommended_scenes":["podcast"],"reasons":["blocking listening issue","Chinese-English code-switch score below 3/5"]},{"voice_id":"zf_xiaoni","name":"Xiaoni","locale":"zh-CN","scores":{"naturalness":4,"pronunciation_accuracy":4,"long_sentence_stability":4,"longform_consistency":4,"audio_integrity":4,"code_switch":1},"featured_eligible":false,"recommended_scenes":[],"reasons":["blocking listening issue","Chinese-English code-switch score below 3/5","no use-case score reached 4/5"]},{"voice_id":"af_sarah","name":"Sarah","locale":"en-US","scores":{"naturalness":3,"pronunciation_accuracy":5,"long_sentence_stability":5,"longform_consistency":5,"audio_integrity":5,"code_switch":1},"featured_eligible":false,"recommended_scenes":["article","podcast"],"reasons":["naturalness score below 4/5"]},{"voice_id":"zf_xiaoxiao","name":"Xiaoxiao","locale":"zh-CN","scores":{"naturalness":3,"pronunciation_accuracy":5,"long_sentence_stability":5,"longform_consistency":5,"audio_integrity":5,"code_switch":1},"featured_eligible":false,"recommended_scenes":["article","course","podcast"],"reasons":["blocking listening issue","naturalness score below 4/5","Chinese-English code-switch score below 3/5"]},{"voice_id":"zm_yunyang","name":"Yunyang","locale":"zh-CN","scores":{"naturalness":3,"pronunciation_accuracy":4,"long_sentence_stability":4,"longform_consistency":5,"audio_integrity":5,"code_switch":1},"featured_eligible":false,"recommended_scenes":["article"],"reasons":["blocking listening issue","naturalness score below 4/5","Chinese-English code-switch score below 3/5"]},{"voice_id":"zm_yunxia","name":"Yunxia","locale":"zh-CN","scores":{"naturalness":3,"pronunciation_accuracy":4,"long_sentence_stability":4,"longform_consistency":5,"audio_integrity":5,"code_switch":1},"featured_eligible":false,"recommended_scenes":[],"reasons":["blocking listening issue","naturalness score below 4/5","Chinese-English code-switch score below 3/5","no use-case score reached 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This does not show that Chinese-market demand is absent."}}