{"schema":"postcutoff/model@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/m/inworld-tts-2/","md":"https://postcutoff.com/m/inworld-tts-2/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":"inworld-tts-2","name":"Inworld Realtime TTS-2 / TTS-2 Flash","org":"Inworld AI","family":"Inworld TTS","released":"2026-08-31","status":"current","type":"audio/speech","modality_in":["text","audio"],"modality_out":["audio"],"open_weights":false,"model_license":"proprietary","context_window":null,"max_output":null,"knowledge_cutoff":null,"pricing":{"per_1m_characters":25,"unit":"USD per 1M characters PAYG for TTS-2 ($15 for TTS-2 Flash); plan rates down to $12.50/$7, enterprise from $5","source":"https://inworld.ai/pricing"},"price_line":"$25 per 1M characters","access":[{"provider":"Inworld API","model_id":"inworld-tts-2","endpoint":"https://api.inworld.ai/tts/v1/voice","docs":"https://docs.inworld.ai/tts/tts-models"},{"provider":"Cloudflare Workers AI","url":"https://developers.cloudflare.com/ai/models/inworld/tts-2/"}],"capabilities":[{"name":"Closed-loop, audio-aware delivery","detail":"Conditions on the actual audio of prior turns (user tone, pacing, emotion), not just transcripts, and takes plain-English voice direction; delivery modes STABLE/BALANCED/CREATIVE.","first":false,"discovered":"launch","source":"https://inworld.ai/blog/realtime-tts-2"},{"name":"Cross-lingual identity in 100+ languages","detail":"One voice holds identity while switching language on the fly; cloning from 5-15 s reference or voice design from a text description.","first":false,"discovered":"launch","source":"https://inworld.ai/blog/realtime-tts-2"},{"name":"Flash variant ~20 ms TTFB","detail":"TTS-2 Flash: ~20 ms TTFB, ~5x faster than inworld-tts-2 (docs); TTS-2 median TTFA under 200 ms.","first":false,"discovered":"launch","source":"https://docs.inworld.ai/tts/tts-models"}],"entry":"2026-08-31-inworld-realtime-tts-2","notes":"Research preview 2026-05-05, GA 2026-08-31. Inworld claimed #1 on Artificial Analysis Speech Arena; on 2026-09-29 AA shows it #5 (Elo 1244) behind Eleven v4, Sonic 3.6, Gemini 3.8 Flash TTS, Qwen-Audio-3.0-TTS-Plus. Docs say 200+ languages vs 100+ in blog. TTS-1..1.5 discontinued 2026-06-15 (auto-routed). Flash model id not verified. Max 2,000 chars/request.","verified":"2026-09-29","body_md":"Sources: https://inworld.ai/blog/realtime-tts-2 , https://docs.inworld.ai/tts/tts-models , https://inworld.ai/pricing","page_url":"https://postcutoff.com/m/inworld-tts-2/","standing":{"kind":"speech and audio","newer_count":30,"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":null,"after":null,"weights":"closed","licence":"proprietary","licence_permissive":false,"summary":"Closed weights; access is hosted only."}}