{"schema":"postcutoff/model@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/m/stepaudio-3-asr-tts/","md":"https://postcutoff.com/m/stepaudio-3-asr-tts/index.md","disclosure":{"written_by":"AI agents (Claude Opus 5.5 in Claude Code)","editor":"human editor","policy":"https://postcutoff.com/about/"},"license":null,"id":"stepaudio-3-asr-tts","name":"StepAudio 3 ASR Max / StepAudio 3 TTS","org":"StepFun","family":"StepAudio 3","released":"2026-09-15","status":"current","type":"audio/speech","modality_in":["audio","text"],"modality_out":["text","audio"],"open_weights":false,"model_license":"proprietary","context_window":null,"max_output":null,"knowledge_cutoff":null,"pricing":{"per_hour_asr":0.4,"per_10k_characters_tts":0.36,"unit":"USD: stepaudio-3-asr-max $0.40/hour of audio; stepaudio-3-tts $0.36 per 10,000 characters; voice cloning $1.50/voice","source":"https://platform.stepfun.ai/docs/en/pricing/details"},"price_line":"$0.40 per hour, speech recognition","access":[{"provider":"StepFun API","model_id":"stepaudio-3-asr-max","docs":"https://platform.stepfun.ai/docs/en/guides/models/audio"},{"provider":"StepFun API","model_id":"stepaudio-3-tts","docs":"https://platform.stepfun.ai/docs/en/guides/models/audio"},{"provider":"StepFun API (preview)","model_id":"stepaudio-3-gen-preview","docs":"https://platform.stepfun.ai/docs/en/guides/models/audio"}],"capabilities":[{"name":"#1 non-streaming ASR on AA-WER","detail":"Artificial Analysis ranked StepAudio 3 ASR #1 on its AA-WER Index for non-streaming speech-to-text with 1.7% WER (StepAudio 2.5 ASR: 4.7%).","first":false,"discovered":"launch","source":"https://x.com/ArtificialAnlys/status/2102485740248842710"},{"name":"Context-aware streaming TTS","detail":"Natural, context-aware speech with low-latency streaming, natural-language control and voice cloning; 1,000-char input limit; wav/mp3/flac/opus/pcm.","first":false,"discovered":"launch","source":"https://platform.stepfun.ai/docs/en/guides/models/audio"}],"entry":"2026-09-15-stepfun-stepaudio-3","notes":"Family file for the non-realtime StepAudio 3 models. Languages: zh, en, ja, ko, fr, es (non-zh/en in preview). stepaudio-3-gen-preview (speech+SFX+ambience+BGM) and stepaudio-3-music-preview are free during preview. Previous gen: stepaudio-2.5-asr ($0.022/h), stepaudio-2.5-asr-stream ($0.18/h), stepaudio-2.5-tts ($0.85/10k chars). Exact per-model release date assumed = family launch 2026-09-15.","verified":"2026-09-29","body_md":"Sources: https://platform.stepfun.ai/docs/en/guides/models/audio · https://platform.stepfun.ai/docs/en/pricing/details","page_url":"https://postcutoff.com/m/stepaudio-3-asr-tts/","standing":{"kind":"speech and audio","newer_count":25,"newer":[{"id":"nemotron-3-5-transcribe","name":"NVIDIA Nemotron 3.5 Transcribe (30B-A4B)","org":"NVIDIA","released":"2026-10-28","page_url":"https://postcutoff.com/m/nemotron-3-5-transcribe/"},{"id":"hy-simulmt-30b-a3b","name":"Hy-SimulMT-30B-A3B","org":"Tencent","released":"2026-10-22","page_url":"https://postcutoff.com/m/hy-simulmt-30b-a3b/"},{"id":"eleven-realtime-v1-max","name":"Eleven Realtime v1 Max / Mini","org":"ElevenLabs","released":"2026-10-20","page_url":"https://postcutoff.com/m/eleven-realtime-v1-max/"},{"id":"voxtral-mini-transcribe-3","name":"Voxtral Mini Transcribe 3 (+ Mini Transcribe Realtime 3)","org":"Mistral AI","released":"2026-10-20","page_url":"https://postcutoff.com/m/voxtral-mini-transcribe-3/"},{"id":"voxtral-small-transcribe-3","name":"Voxtral Small Transcribe 3","org":"Mistral AI","released":"2026-10-20","page_url":"https://postcutoff.com/m/voxtral-small-transcribe-3/"}],"before":{"id":"step-audio-editx","name":"StepFun Step-Audio-EditX","org":"StepFun","released":"2025-11-06","page_url":"https://postcutoff.com/m/step-audio-editx/"},"after":null,"weights":"closed","licence":"proprietary","licence_permissive":false,"summary":"Closed weights; access is hosted only."}}