--- title: "CosyVoice vs dia2" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/funaudiollm-cosyvoice-vs-nari-labs-dia2" tools: ["funaudiollm-cosyvoice", "nari-labs-dia2"] --- # CosyVoice vs dia2 *GraphCanon updated Jul 12, 2026* ## Verdict Pick CosyVoice when tags unique to CosyVoice: audio-generation, cantonese, chatbot, chatgpt; pick dia2 when tags unique to dia2: open-weight, python, text-to-speech. [CosyVoice](https://funaudiollm.github.io/cosyvoice3) reports 22k GitHub stars, 2.5k forks, and 767 open issues, last pushed May 25, 2026. [dia2](https://github.com/nari-labs/dia2) has 1.2k stars, 99 forks, and 5 open issues, last pushed Nov 29, 2025. Figures are from public GitHub metadata via [CosyVoice's repository](https://github.com/FunAudioLLM/CosyVoice) and [dia2's repository](https://github.com/nari-labs/dia2). | | [CosyVoice](/tools/funaudiollm-cosyvoice.md) | [dia2](/tools/nari-labs-dia2.md) | | --- | --- | --- | | Tagline | Multi-lingual large voice generation model with full-stack abilities for inference, training and deployment. | TTS model capable of streaming conversational audio in realtime. | | Stars | 22,089 | 1,154 | | Forks | 2,545 | 99 | | Open issues | 767 | 5 | | Language | Python | Python | | Adopt for | CosyVoice is a Python-based multi-lingual large voice generation model. It supports extensive capabilities including fine-tuning, TTS (Text-To-Speech), and natural language generation. | - | | Persona | - | - | | Runtime | - | - | | License | Apache-2.0 | Apache-2.0 | | Categories | Inference & Serving, Model Training, Speech & Audio | Speech & Audio | ## Trust and health _Sourced signals - not a safety guarantee. No winner column._ | | [CosyVoice](/tools/funaudiollm-cosyvoice.md) | [dia2](/tools/nari-labs-dia2.md) | | --- | --- | --- | | Maintenance | Steady (60%) | Slowing (36%) | | Days since push | 46d | 224d | | Open issues (now) | 767 | 5 | | Full report | [trust report](/tools/funaudiollm-cosyvoice/trust.md) | [trust report](/tools/nari-labs-dia2/trust.md) | ## Decision facts: CosyVoice - **Adopt for:** CosyVoice is a Python-based multi-lingual large voice generation model. It supports extensive capabilities including fine-tuning, TTS (Text-To-Speech), and natural language generation. ## Choose when ### Choose CosyVoice if… - Tags unique to CosyVoice: audio-generation, cantonese, chatbot, chatgpt. - Also covers Inference & Serving, Model Training. - When you need support for multiple languages like Cantonese, Chinese, English, Japanese, and Korean. ### Choose dia2 if… - Tags unique to dia2: open-weight, python, text-to-speech. - Leaner open-issue backlog (5). ## When NOT to use CosyVoice - If your project specifically requires fine-tuned performance in languages not supported by CosyVoice such as Arabic or Spanish. - When strict real-time speech synthesis requirements are essential, as CosyVoice may face delays depending on the environment's computational power and model complexity. ## When NOT to use dia2 - Last GitHub push was 225 days ago (slowing maintenance, Nov 29, 2025). Validate activity before betting a new project on dia2. ## Common questions ### What is the difference between CosyVoice and dia2? CosyVoice: Multi-lingual large voice generation model with full-stack abilities for inference, training and deployment.. dia2: TTS model capable of streaming conversational audio in realtime.. See the comparison table for live GitHub stats and shared categories. ### When should I choose CosyVoice over dia2? Choose CosyVoice over dia2 when Tags unique to CosyVoice: audio-generation, cantonese, chatbot, chatgpt; Also covers Inference & Serving, Model Training; When you need support for multiple languages like Cantonese, Chinese, English, Japanese, and Korean. ### When should I choose dia2 over CosyVoice? Choose dia2 over CosyVoice when Tags unique to dia2: open-weight, python, text-to-speech; Leaner open-issue backlog (5). ### When should I avoid CosyVoice? If your project specifically requires fine-tuned performance in languages not supported by CosyVoice such as Arabic or Spanish. When strict real-time speech synthesis requirements are essential, as CosyVoice may face delays depending on the environment's computational power and model complexity. ### When should I avoid dia2? Last GitHub push was 225 days ago (slowing maintenance, Nov 29, 2025). Validate activity before betting a new project on dia2. ### Is CosyVoice or dia2 more popular on GitHub? CosyVoice has more GitHub stars (22,089 vs 1,154). Stars measure visibility, not whether either tool fits your constraints. ### Are CosyVoice and dia2 open source? Yes - both are open-source projects on GitHub (CosyVoice: Apache-2.0, dia2: Apache-2.0). ### Where can I find alternatives to CosyVoice or dia2? GraphCanon lists graph-backed alternatives at [CosyVoice alternatives](/tools/funaudiollm-cosyvoice/alternatives) and [dia2 alternatives](/tools/nari-labs-dia2/alternatives) ([CosyVoice markdown twin](/tools/funaudiollm-cosyvoice/alternatives.md), [dia2 markdown twin](/tools/nari-labs-dia2/alternatives.md)), ranked by typed relationship edges rather than popularity votes. ### Is there a machine-readable version of this comparison? Yes. The markdown twin at [this comparison](/compare/funaudiollm-cosyvoice-vs-nari-labs-dia2.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, CosyVoice or dia2? CosyVoice: Steady. dia2: Slowing. Compare maintenance labels, days since push, and release cadence in the trust section below - stars alone do not measure maintenance. ### Where are the full trust reports for CosyVoice and dia2? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [CosyVoice trust report](/tools/funaudiollm-cosyvoice/trust); [dia2 trust report](/tools/nari-labs-dia2/trust). --- **Machine-readable endpoints** - JSON: [`/api/graphcanon/graph?tool=funaudiollm-cosyvoice`](/api/graphcanon/graph?tool=funaudiollm-cosyvoice) - LLM index: [/llms.txt](/llms.txt) - Full corpus: [/llms-full.txt](/llms-full.txt) _GraphCanon - The knowledge graph for AI development. https://www.graphcanon.com/_