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Comparison

FastChat vs heretic

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 heretic if heretic is a Python-based tool that removes censorship from language models automatically.

Markdown twin · FastChat alternatives · heretic alternatives

GraphCanon updated 5d

FastChat logo

FastChat

lm-sys/FastChat

★ 40kpushed May 1, 2026
vs
heretic logo

heretic

p-e-w/heretic

★ 28kpushed Aug 14, 2026

Trust & integrity

SignalFastChatheretic
Maintenance
Slowing (98d since push)
As of 2w · github_public_v1
Very active (2d since push)
As of 5d · github_public_v1
Provenance
Not a fork · Organization account
As of 2w · github_public_v1
Not a fork · Personal account
As of 5d · 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
FastChat trust reportheretic trust reportTrust methodology

Tagline

FastChat
An open platform for training, serving, and evaluating large language models
heretic
Fully automatic censorship removal for language models

Stars

FastChat
40k
heretic
28k

Forks

FastChat
4.8k
heretic
3.0k

Open issues

FastChat
1.0k
heretic
74

Language

FastChat
Python
heretic
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
heretic
Heretic is a Python-based tool that removes censorship from language models automatically.

Persona

FastChat
-
heretic
-

Runtime

FastChat
-
heretic
-

License

FastChat
Apache-2.0
heretic
AGPL-3.0

Last pushed

FastChat
May 1, 2026
heretic
Aug 14, 2026

Categories

FastChat
Evaluation & Observability, Inference & Serving, LLM Frameworks, Model Training
heretic
Evaluation & Observability, LLM Frameworks

Trust and health

Maintenance

FastChat
Slowing (36%)
heretic
Very active (96%)

Days since push

FastChat
98d
heretic
2d

Open issues (now)

FastChat
1.0k
heretic
74

Stars delta

FastChat
Unknown
heretic
+1.3k (30d)

Open issues delta

FastChat
Unknown
heretic
+2 (30d)

Owner type

FastChat
Organization
heretic
User

Full report

FastChat
Trust report
heretic
Trust report

Choose FastChat if…

  • License: FastChat is Apache-2.0, heretic is AGPL-3.0.
  • Tags unique to FastChat: chatbots, distributed-serving, evaluation system, large language models.
  • Also covers Inference & Serving, Model Training.
  • - 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

Choose heretic if…

  • License: heretic is AGPL-3.0, FastChat is Apache-2.0.
  • Tags unique to heretic: abliteration, llm, transformer.
  • Use Heretic if your work involves uncovering full capabilities of censored or restricted language models. Heretic excels in tasks requiring the removal of such restrictions.

When NOT to use heretic

  • Avoid Heretic if operating within jurisdictions where removing censorship from language models is illegal or against organizational policies. This could result in regulatory violations.
  • If your project does not benefit from uncensored content produced by language models (e.g., compliance-driven applications that require filtering mechanisms), using Heretic might be unnecessary.
GitHubDetails

Explore

FastChat trust report →heretic trust report →Evaluation & Observability category →Inference & Serving category →LLM Frameworks category →Model Training 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: FastChat 40k · heretic 28k (synced Aug 7, 2026).

Common questions

What is the difference between FastChat and heretic?
FastChat: An open platform for training, serving, and evaluating large language models. heretic: Fully automatic censorship removal for language models. See the comparison table for live GitHub stats and shared categories.
When should I choose FastChat over heretic?
Choose FastChat over heretic when License: FastChat is Apache-2.0, heretic is AGPL-3.0; Tags unique to FastChat: chatbots, distributed-serving, evaluation system, large language models; Also covers Inference & Serving, Model Training; - You are looking to train and evaluate state-of-the-art models such as Vicuna or MT-Bench.
When should I choose heretic over FastChat?
Choose heretic over FastChat when License: heretic is AGPL-3.0, FastChat is Apache-2.0; Tags unique to heretic: abliteration, llm, transformer; Use Heretic if your work involves uncovering full capabilities of censored or restricted language models. Heretic excels in tasks requiring the removal of such restrictions.
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 heretic?
Avoid Heretic if operating within jurisdictions where removing censorship from language models is illegal or against organizational policies. This could result in regulatory violations. If your project does not benefit from uncensored content produced by language models (e.g., compliance-driven applications that require filtering mechanisms), using Heretic might be unnecessary.
Is FastChat or heretic more popular on GitHub?
FastChat has more GitHub stars (39,517 vs 27,709). Stars measure visibility, not whether either tool fits your constraints.
Are FastChat and heretic open source?
Yes - both are open-source projects on GitHub (FastChat: Apache-2.0, heretic: AGPL-3.0).
Where can I find alternatives to FastChat or heretic?
GraphCanon lists graph-backed alternatives at FastChat alternatives and heretic alternatives (FastChat markdown twin, heretic 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 heretic?
FastChat: Slowing. heretic: 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 heretic?
GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: FastChat trust report; heretic trust report.

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