Comparison
FastChat vs rhesis
Verdict
Pick FastChat when license: FastChat is Apache-2.0, rhesis is Other; pick rhesis when license: rhesis is Other, FastChat is Apache-2.0.
Markdown twin · FastChat alternatives · rhesis alternatives
GraphCanon updated today
Trust & integrity
| Signal | FastChat | rhesis |
|---|---|---|
| Maintenance | Steady (71d since push) As of today · github_public_v1 | Very active (0d 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 |
Tagline
- FastChat
- An open platform for training, serving, and evaluating large language models
- rhesis
- The testing platform for AI teams. Bring engineers, PMs, and domain experts together to generate tests, simulate (adversarial) conversations, and trace every failure to its root cause.
Stars
- FastChat
- 39k
- rhesis
- 379
Forks
- FastChat
- 4.8k
- rhesis
- 27
Open issues
- FastChat
- 1.0k
- rhesis
- 119
Language
- FastChat
- Python
- rhesis
- Python
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
- rhesis
- -
Persona
- FastChat
- -
- rhesis
- -
Runtime
- FastChat
- -
- rhesis
- -
License
- FastChat
- Apache-2.0
- rhesis
- Other
Last pushed
- FastChat
- May 1, 2026
- rhesis
- Jul 10, 2026
Categories
- FastChat
- Model Training, LLM Frameworks, Inference & Serving, Evaluation & Observability
- rhesis
- LLM Frameworks, Evaluation & Observability
Trust and health
Maintenance
- FastChat
- Steady (60%)
- rhesis
- Very active (96%)
Days since push
- FastChat
- 71d
- rhesis
- 0d
Open issues (now)
- FastChat
- 1.0k
- rhesis
- 119
Full report
- FastChat
- Trust report
- rhesis
- Trust report
Choose FastChat if…
- License: FastChat is Apache-2.0, rhesis is Other.
- Tags unique to FastChat: evaluation system, large-language-models, chatbots, distributed serving.
- Also covers Model Training, Inference & Serving.
- - 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 rhesis if…
- License: rhesis is Other, FastChat is Apache-2.0.
- Tags unique to rhesis: llmops, quality-assessment, generative-ai, responsible-ai.
- More recently updated (last pushed Jul 10, 2026).
When NOT to use rhesis
- LLM Frameworks: Avoid a framework for a single prompt-and-retrieve call; the abstraction can cost more than it saves.
- Evaluation & Observability: Defer heavyweight eval infra only until you have real traffic - never skip it once users depend on answers.
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 Jul 11, 2026
- GitHub forks (lm-sys/FastChat) · observed Jul 11, 2026
- Last push (lm-sys/FastChat) · observed May 1, 2026
- License file (Apache-2.0) · observed Jul 11, 2026
- Decision facts (enrichment) · observed Jul 11, 2026
- Trust scan (lockfile / OSV) · observed Jul 11, 2026
- GitHub stars (rhesis-ai/rhesis) · observed Jul 11, 2026
- GitHub forks (rhesis-ai/rhesis) · observed Jul 11, 2026
- Last push (rhesis-ai/rhesis) · observed Jul 10, 2026
- License file (Other) · observed Jul 11, 2026
- Trust scan (lockfile / OSV) · observed Jul 11, 2026
GitHub stars on cards: FastChat 39k · rhesis 379 (synced Jul 11, 2026).
Common questions
- What is the difference between FastChat and rhesis?
- FastChat: An open platform for training, serving, and evaluating large language models. rhesis: The testing platform for AI teams. Bring engineers, PMs, and domain experts together to generate tests, simulate (adversarial) conversations, and trace every failure to its root cause.. See the comparison table for live GitHub stats and shared categories.
- When should I choose FastChat over rhesis?
- Choose FastChat over rhesis when License: FastChat is Apache-2.0, rhesis is Other; Tags unique to FastChat: evaluation system, large-language-models, chatbots, distributed serving; Also covers Model Training, Inference & Serving; - You are looking to train and evaluate state-of-the-art models such as Vicuna or MT-Bench.
- When should I choose rhesis over FastChat?
- Choose rhesis over FastChat when License: rhesis is Other, FastChat is Apache-2.0; Tags unique to rhesis: llmops, quality-assessment, generative-ai, responsible-ai; More recently updated (last pushed Jul 10, 2026).
- 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 rhesis?
- LLM Frameworks: Avoid a framework for a single prompt-and-retrieve call; the abstraction can cost more than it saves. Evaluation & Observability: Defer heavyweight eval infra only until you have real traffic - never skip it once users depend on answers.
- Is FastChat or rhesis more popular on GitHub?
- FastChat has more GitHub stars (39,490 vs 379). Stars measure visibility, not whether either tool fits your constraints.
- Are FastChat and rhesis open source?
- Yes - both are open-source projects on GitHub (FastChat: Apache-2.0, rhesis: Other).
- Where can I find alternatives to FastChat or rhesis?
- GraphCanon lists graph-backed alternatives at FastChat alternatives and rhesis alternatives (FastChat markdown twin, rhesis 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 rhesis?
- FastChat: Steady. rhesis: Very active. 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 rhesis?
- GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: FastChat trust report; rhesis trust report.