Comparison
FastChat vs GPTRouter
Verdict
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; pick GPTRouter if gPTRouter is notable for TypeScript and handles multiple LLMs and image models like OpenAI, Anthropic, Azure, Dall-E, SDXL with improved reliability and.
Markdown twin · FastChat alternatives · GPTRouter alternatives
GraphCanon updated 4d
vs
Trust & integrity
| Signal | FastChat | GPTRouter |
|---|---|---|
| Maintenance | Slowing (98d since push) As of 2w · github_public_v1 | Dormant (862d since push) As of 4d · github_public_v1 |
| Provenance | Not a fork · Organization account As of 2w · github_public_v1 | Not a fork · Organization account As of 4d · github_public_v1 |
| OSV dependency advisories | No lockfile (source not queried) As of 1mo · osv@v1 | No lockfile (source not queried) As of 1mo · osv@v1 |
| deps.dev advisories | Not queried deps.dev@v1 | Not queried deps.dev@v1 |
| OpenSSF Scorecard | Not queried openssf-scorecard@v1 | Not queried openssf-scorecard@v1 |
Tagline
- FastChat
- An open platform for training, serving, and evaluating large language models
- GPTRouter
- Manage multiple LLMs and image models for reliable and fast responses
Stars
- FastChat
- 40k
- GPTRouter
- 455
Forks
- FastChat
- 4.8k
- GPTRouter
- 38
Open issues
- FastChat
- 1.0k
- GPTRouter
- 10
Language
- FastChat
- Python
- GPTRouter
- TypeScript
Adopt for
- 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
- GPTRouter
- GPTRouter is notable for TypeScript and handles multiple LLMs and image models like OpenAI, Anthropic, Azure, Dall-E, SDXL with improved reliability and speed.
Persona
- FastChat
- -
- GPTRouter
- -
Runtime
- FastChat
- -
- GPTRouter
- -
License
- FastChat
- Apache-2.0
- GPTRouter
- The MIT license applies to GPTRouter, offering permissive use with conditions only requiring preservation of copyright and license notices.
Last pushed
- FastChat
- May 1, 2026
- GPTRouter
- Apr 10, 2024
Categories
- FastChat
- Evaluation & Observability, Inference & Serving, LLM Frameworks, Model Training
- GPTRouter
- Inference & Serving, LLM Frameworks, Model Training
Trust and health
Maintenance
- FastChat
- Slowing (36%)
- GPTRouter
- Dormant (18%)
Days since push
- FastChat
- 98d
- GPTRouter
- 862d
Open issues (now)
- FastChat
- 1.0k
- GPTRouter
- 10
Stars delta
- FastChat
- Unknown
- GPTRouter
- 0 (30d)
Open issues delta
- FastChat
- Unknown
- GPTRouter
- 0 (30d)
Full report
- FastChat
- Trust report
- GPTRouter
- Trust report
Choose FastChat if…
- FastChat is primarily Python; GPTRouter is TypeScript.
- License: FastChat is Apache-2.0, GPTRouter is MIT.
- Tags unique to FastChat: chatbots, distributed-serving, evaluation system, large language models.
- Also covers 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.
Choose GPTRouter if…
- GPTRouter is primarily TypeScript; FastChat is Python.
- License: GPTRouter is MIT, FastChat is Apache-2.0.
- Pricing: GPTRouter is open-source under the MIT License. However, costs might arise from using associated models like OpenAI or Anthropic..
- Requirements: Min 2 GB RAM.
- Tags unique to GPTRouter: anthropic, azure-openai, cohere, google-gemini.
- GPTRouter ships Docker support for self-hosted deployment.
- When your project requires seamless integration of different language models such as OpenAI, Anthropic, and Azure and demands reliability and fast response times.
When NOT to use GPTRouter
- Avoid using GPTRouter if your project strictly uses Python without the flexibility to adopt TypeScript, as it may hinder seamless integration.
- If your application exclusively focuses on a single LLM or image model provider lacking the need for managing multiple providers, consider alternatives more focused in scope and potentially lighter.
Explore
Sources
Every stat on this page traces to a dated GitHub sync, license file, enrichment field, or trust scan.
- GitHub stars (lm-sys/FastChat) · observed Aug 7, 2026
- GitHub forks (lm-sys/FastChat) · observed Aug 7, 2026
- Last push (lm-sys/FastChat) · observed May 1, 2026
- License file (Apache-2.0) · observed Aug 7, 2026
- Decision facts (enrichment) · observed Jul 11, 2026
- Trust scan (lockfile / OSV) · observed Jul 11, 2026
- GitHub stars (Writesonic/GPTRouter) · observed Aug 21, 2026
- GitHub forks (Writesonic/GPTRouter) · observed Aug 21, 2026
- Last push (Writesonic/GPTRouter) · observed Apr 10, 2024
- License file (MIT) · observed Aug 21, 2026
- Decision facts (enrichment) · observed Jul 14, 2026
- Trust scan (lockfile / OSV) · observed Jul 11, 2026
GitHub stars on cards: FastChat 40k · GPTRouter 455 (synced Aug 7, 2026).
Common questions
- What is the difference between FastChat and GPTRouter?
- FastChat: An open platform for training, serving, and evaluating large language models. GPTRouter: Manage multiple LLMs and image models for reliable and fast responses. See the comparison table for live GitHub stats and shared categories.
- When should I choose FastChat over GPTRouter?
- Choose FastChat over GPTRouter when FastChat is primarily Python; GPTRouter is TypeScript; License: FastChat is Apache-2.0, GPTRouter is MIT; Tags unique to FastChat: chatbots, distributed-serving, evaluation system, large language models; Also covers Evaluation & Observability; - You are looking to train and evaluate state-of-the-art models such as Vicuna or MT-Bench.
- When should I choose GPTRouter over FastChat?
- Choose GPTRouter over FastChat when GPTRouter is primarily TypeScript; FastChat is Python; License: GPTRouter is MIT, FastChat is Apache-2.0; Pricing: GPTRouter is open-source under the MIT License. However, costs might arise from using associated models like OpenAI or Anthropic.; Requirements: Min 2 GB RAM; Tags unique to GPTRouter: anthropic, azure-openai, cohere, google-gemini; GPTRouter ships Docker support for self-hosted deployment; When your project requires seamless integration of different language models such as OpenAI, Anthropic, and Azure and demands reliability and fast response times.
- 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.
- When should I avoid GPTRouter?
- Avoid using GPTRouter if your project strictly uses Python without the flexibility to adopt TypeScript, as it may hinder seamless integration. If your application exclusively focuses on a single LLM or image model provider lacking the need for managing multiple providers, consider alternatives more focused in scope and potentially lighter.
- Is FastChat or GPTRouter more popular on GitHub?
- FastChat has more GitHub stars (39,517 vs 455). Stars measure visibility, not whether either tool fits your constraints.
- Are FastChat and GPTRouter open source?
- Yes - both are open-source projects on GitHub (FastChat: Apache-2.0, GPTRouter: MIT).
- Where can I find alternatives to FastChat or GPTRouter?
- GraphCanon lists graph-backed alternatives at FastChat alternatives and GPTRouter alternatives (FastChat markdown twin, GPTRouter 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, FastChat or GPTRouter?
- FastChat: Slowing. GPTRouter: Dormant. 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 FastChat and GPTRouter?
- GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: FastChat trust report; GPTRouter trust report.