Repository brief

lm-sys/FastChat

Read the upstream summary on the left, browse the cached forks below it, and load each fork comparison into the right-hand panel.

Cached analysis

cached 2026-03-31T14:36:46.689Z

lm-sys/FastChat

lm-sys/FastChat appears to be an open source project focused on Container tooling, Documentation site, Python. An open platform for training, serving, and evaluating large language models. Release repo for Vicuna and Chatbot Arena.

GitHub

Stars39,458

Forks4,785

Default branchmain

Last pushed2025-06-02T15:22:03Z

Best maintainedNone

Closest to upstreamlmarena/FastChat

Most feature-richeddieali/Vicuna-AI-LLM

Most opinionatededdieali/Vicuna-AI-LLM

Forks

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10 cached fork briefs

Fork comparison

thisserand/FastChat

stale

significant_divergence

This fork is materially different enough that adopters should validate long-term maintenance and upgrade cost.

Likely purpose

Extends upstream with additional capabilities.

Best for

Users who specifically need the fork's additional behavior.

Additional features

Fork-specific work appears around `playground/data/alpaca-data-conversation.json`.
Fork-specific work appears around `data/dummy_conversation.json`.
Fork-specific work appears around `fastchat/model/model_adapter.py`.
Fork-specific work appears around `fastchat/conversation.py`.
Expands API, schema, or SDK surface area for downstream integrations and generated clients.
Introduces more operational workflow surface such as server-side handling, auth, session control, or admin tooling.

Missing features

It trails upstream by 200 commits, so some recent upstream features and fixes are likely not present yet.

Strengths

Ahead of upstream by 108 commits.
Touches 253 files across 10 main areas.

Risks

Behind upstream by 200 commits.
Recent maintenance activity looks weak.