LLM Comparison
IndexTTS vs OmniVoice
Side-by-side specs, pricing & capabilities · Updated October 2026
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2/6 modelsSame tier:
| Organization | ||
| OpenTools Score | ||
| Family | IndexTTS | OmniVoice |
| Status | Current | Current |
| Release Date | Aug 2026 | Mar 2026 |
| Context Window | — | — |
| Input Price | — | — |
| Output Price | — | — |
| Pricing Notes | Open model weights; hosting and GPU inference costs depend on the deployment environment. | Open-source model repository; hosted API pricing is not listed in the GitHub README. |
| Capabilities | text-to-speechvoice-cloningmultilingualemotion-controlpronunciation-controlspeed-control | text-to-speechvoice-cloningmultilingual-audiovoice-design |
| Training Cutoff | Public release timeline through 2026-08 | Not publicly specified |
| API Identifier | IndexTeam/IndexTTS-2.5 | k2-fsa/OmniVoice |
| Benchmarks | ||
| Real-time factor (best-case author claim) | — | 0.025official-github-readme |
| View IndexTTS | View OmniVoice | |
IndexTeam
IndexTTS
IndexTTS is a controllable zero-shot text-to-speech model family from IndexTeam and Bilibili. The 2.5 release clones voices from a single reference clip, supports Chinese, English, Japanese, Spanish, and Arabic, and reports a 2.28x real-time-factor improvement over IndexTTS 2 in its technical report.
K2-FSA
OmniVoice
OmniVoice is an open-source massively multilingual zero-shot text-to-speech and voice-cloning model from K2-FSA. The project README says it supports more than 600 languages, voice design controls, and fast inference with real-time factor as low as 0.025.
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