Comparison
openchat vs FastChat
Verdict
Pick openchat if a Python library for training large language models with imperfect data using transformers; 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 · openchat alternatives · FastChat alternatives
GraphCanon updated 2d
Trust & integrity
| Signal | openchat | FastChat |
|---|---|---|
| Maintenance | Dormant (703d since push) As of 2d · github_public_v1 | Slowing (98d since push) As of 1w · github_public_v1 |
| Provenance | Not a fork · Personal account As of 2d · github_public_v1 | Not a fork · Organization account As of 1w · 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
- openchat
- Advancing Open-source Language Models with Imperfect Data
- FastChat
- An open platform for training, serving, and evaluating large language models
Stars
- openchat
- 5.5k
- FastChat
- 40k
Forks
- openchat
- 432
- FastChat
- 4.8k
Open issues
- openchat
- 137
- FastChat
- 1.0k
Language
- openchat
- Python
- FastChat
- Python
Adopt for
- openchat
- A Python library for training large language models with imperfect data using transformers.
- 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
- openchat
- -
- FastChat
- -
Runtime
- openchat
- -
- FastChat
- -
License
- openchat
- Apache-2.0
- FastChat
- Apache-2.0
Last pushed
- openchat
- Sep 13, 2024
- FastChat
- May 1, 2026
Categories
- openchat
- LLM Frameworks, Model Training
- FastChat
- Evaluation & Observability, Inference & Serving, LLM Frameworks, Model Training
Trust and health
Maintenance
- openchat
- Dormant (18%)
- FastChat
- Slowing (36%)
Days since push
- openchat
- 703d
- FastChat
- 98d
Open issues (now)
- openchat
- 137
- FastChat
- 1.0k
Stars delta
- openchat
- +2 (30d)
- FastChat
- Unknown
Open issues delta
- openchat
- +1 (30d)
- FastChat
- Unknown
Owner type
- openchat
- User
- FastChat
- Organization
Full report
- openchat
- Trust report
- FastChat
- Trust report
Choose openchat if…
- Tags unique to openchat: apache license 2.0, cuda, open-source, pytorch.
- You need to train models on datasets with noise or missing information
- Leaner open-issue backlog (137).
When NOT to use openchat
- If your dataset is clean and well-structured, reducing model inaccuracies
- Projects that cannot depend on Apache License 2.0 or install PyTorch with CUDA support
Choose FastChat if…
- Tags unique to FastChat: chatbots, distributed-serving, evaluation system.
- Also covers Evaluation & Observability, 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.
Explore
Sources
Every stat on this page traces to a dated GitHub sync, license file, enrichment field, or trust scan.
- GitHub stars (imoneoi/openchat) · observed Aug 17, 2026
- GitHub forks (imoneoi/openchat) · observed Aug 17, 2026
- Last push (imoneoi/openchat) · observed Sep 13, 2024
- License file (Apache-2.0) · observed Aug 17, 2026
- Decision facts (enrichment) · observed Jul 14, 2026
- Trust scan (lockfile / OSV) · observed Jul 11, 2026
- 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 on cards: openchat 5.5k · FastChat 40k (synced Aug 17, 2026).
Common questions
- What is the difference between openchat and FastChat?
- openchat: Advancing Open-source Language Models with Imperfect Data. 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 openchat over FastChat?
- Choose openchat over FastChat when Tags unique to openchat: apache license 2.0, cuda, open-source, pytorch; You need to train models on datasets with noise or missing information; Leaner open-issue backlog (137).
- When should I choose FastChat over openchat?
- Choose FastChat over openchat when Tags unique to FastChat: chatbots, distributed-serving, evaluation system; Also covers Evaluation & Observability, Inference & Serving; - You are looking to train and evaluate state-of-the-art models such as Vicuna or MT-Bench.
- When should I avoid openchat?
- If your dataset is clean and well-structured, reducing model inaccuracies Projects that cannot depend on Apache License 2.0 or install PyTorch with CUDA support
- 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 openchat or FastChat more popular on GitHub?
- FastChat has more GitHub stars (39,517 vs 5,487). Stars measure visibility, not whether either tool fits your constraints.
- Are openchat and FastChat open source?
- Yes - both are open-source projects on GitHub (openchat: Apache-2.0, FastChat: Apache-2.0).
- Where can I find alternatives to openchat or FastChat?
- GraphCanon lists graph-backed alternatives at openchat alternatives and FastChat alternatives (openchat 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, openchat or FastChat?
- openchat: Dormant. FastChat: 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 openchat and FastChat?
- GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: openchat trust report; FastChat trust report.