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Comparison

CosyVoice vs FastChat

Verdict

Pick CosyVoice if 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; pick FastChat if fastChat is a comprehensive open platform for managing large language models (LLMs) that includes capabilities for training, serving, evaluating, and comparing chatbot models via web UIs and RESTful APIs. It powers ChatB.

Markdown twin · CosyVoice alternatives · FastChat alternatives

GraphCanon updated today

CosyVoice logo

CosyVoice

FunAudioLLM/CosyVoice

★ 22kpushed May 25, 2026
vs
FastChat logo

FastChat

lm-sys/FastChat

★ 39kpushed May 1, 2026

Trust & integrity

SignalCosyVoiceFastChat
Maintenance
Steady (46d since push)
As of today · github_public_v1
Steady (71d since push)
As of today · github_public_v1
Provenance
Not a fork · Organization account
As of today · github_public_v1
Not a fork · Organization account
As of today · github_public_v1
Security (OSV)
No lockfile
As of today · none
No lockfile
As of today · none
CosyVoice trust reportFastChat trust reportTrust methodology

Tagline

CosyVoice
Multi-lingual large voice generation model with full-stack abilities for inference, training and deployment.
FastChat
An open platform for training, serving, and evaluating large language models

Stars

CosyVoice
22k
FastChat
39k

Forks

CosyVoice
2.5k
FastChat
4.8k

Open issues

CosyVoice
767
FastChat
1.0k

Language

CosyVoice
Python
FastChat
Python

Adopt for

CosyVoice
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.
FastChat
FastChat is a comprehensive open platform for managing large language models (LLMs) that includes capabilities for training, serving, evaluating, and comparing chatbot models via web UIs and RESTful APIs. It powers ChatB

Persona

CosyVoice
-
FastChat
-

Runtime

CosyVoice
-
FastChat
-

License

CosyVoice
Apache-2.0
FastChat
Apache-2.0

Last pushed

CosyVoice
May 25, 2026
FastChat
May 1, 2026

Categories

CosyVoice
Model Training, Speech & Audio, Inference & Serving
FastChat
Model Training, LLM Frameworks, Inference & Serving, Evaluation & Observability

Trust and health

Days since push

CosyVoice
46d
FastChat
71d

Open issues (now)

CosyVoice
767
FastChat
1.0k

Full report

CosyVoice
Trust report
FastChat
Trust report

Choose CosyVoice if…

  • Tags unique to CosyVoice: cantonese, audio-generation, chinese, english.
  • Also covers Speech & Audio.
  • When you need support for multiple languages like Cantonese, Chinese, English, Japanese, and Korean.

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.
GitHubDetails

Choose FastChat if…

  • Tags unique to FastChat: evaluation system, large-language-models, chatbots, distributed serving.
  • Also covers LLM Frameworks, Evaluation & Observability.
  • - You are looking to train and evaluate state-of-the-art models such as Vicuna or MT-Bench.

When NOT to use FastChat

  • - You require a proprietary or closed-source framework; FastChat is open-source under Apache-2.0 license and its use might be unsuitable for environments requiring proprietary solutions.
  • - Your chatbot evaluation needs do not align with the types of data used in FastChat's datasets (e.g., human votes, MT-Bench evaluations).
  • - You prefer a more user-friendly setup without the need to clone a repository and manually install dependencies; FastChat requires installation from source with additional steps for Rust and CMake on
  • + Mac.
GitHubDetails

Explore

CosyVoice trust report →FastChat trust report →Model Training category →Speech & Audio category →Inference & Serving category →LLM Frameworks category →Evaluation & Observability category →All comparisonsStack workflowsTrending tools

Sources

Every stat on this page traces to a dated GitHub sync, license file, enrichment field, or trust scan.

GitHub stars on cards: CosyVoice 22k · FastChat 39k (synced Jul 11, 2026).

Common questions

What is the difference between CosyVoice and FastChat?
CosyVoice: Multi-lingual large voice generation model with full-stack abilities for inference, training and deployment.. FastChat: An open platform for training, serving, and evaluating large language models. See the comparison table for live GitHub stats and shared categories.
When should I choose CosyVoice over FastChat?
Choose CosyVoice over FastChat when Tags unique to CosyVoice: cantonese, audio-generation, chinese, english; Also covers Speech & Audio; When you need support for multiple languages like Cantonese, Chinese, English, Japanese, and Korean.
When should I choose FastChat over CosyVoice?
Choose FastChat over CosyVoice when Tags unique to FastChat: evaluation system, large-language-models, chatbots, distributed serving; Also covers LLM Frameworks, Evaluation & Observability; - You are looking to train and evaluate state-of-the-art models such as Vicuna or MT-Bench.
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 FastChat?
- You require a proprietary or closed-source framework; FastChat is open-source under Apache-2.0 license and its use might be unsuitable for environments requiring proprietary solutions. - Your chatbot evaluation needs do not align with the types of data used in FastChat's datasets (e.g., human votes, MT-Bench evaluations). - You prefer a more user-friendly setup without the need to clone a repository and manually install dependencies; FastChat requires installation from source with additional steps for Rust and CMake on + Mac.
Is CosyVoice or FastChat more popular on GitHub?
FastChat has more GitHub stars (39,490 vs 22,089). Stars measure visibility, not whether either tool fits your constraints.
Are CosyVoice and FastChat open source?
Yes - both are open-source projects on GitHub (CosyVoice: Apache-2.0, FastChat: Apache-2.0).
Where can I find alternatives to CosyVoice or FastChat?
GraphCanon lists graph-backed alternatives at CosyVoice alternatives and FastChat alternatives (CosyVoice markdown twin, FastChat markdown twin), 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 mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers.
Which is better maintained, CosyVoice or FastChat?
CosyVoice: Steady. FastChat: Steady. 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 FastChat?
GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: CosyVoice trust report; FastChat trust report.