Model Hubs & Serving

FastChat

Distributed multi-model LLM serving system with web UI and OpenAI-compatible APIs.

Status
Not yet determined
Last checked
Checked · Oct 8, 2026
License
Open source
Pricing
Free tier · from $0
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What it is

FastChat is a distributed system for serving large language models, offering both a web interface and RESTful APIs compatible with OpenAI. It's designed to support multiple models and provide scalable performance.

FastChat stands out as an open-source, distributed system with both web UI and OpenAI-compatible APIs, making it ideal for developers needing flexibility in serving multiple large language models.

When it fits — and when it doesn’t

A good fit for

  • Teams needing to serve and scale multiple large language models simultaneously

  • Developers looking for an OpenAI-compatible API for their projects

  • Projects requiring a web interface alongside RESTful APIs for LLM access

Look elsewhere if

  • Users who prefer fully managed cloud services without self-hosting requirements

  • Applications that require real-time streaming capabilities (batch-only architecture)

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

  1. 01

    Performance bottlenecks with very large models

    Scalability issues reported when serving models larger than 10B parameters under heavy load

What it does well

  • Distributed system for serving large language models

  • Web UI and OpenAI-compatible RESTful APIs

  • Supports multiple models

  • Scalable performance

Pricing

Free tier
YesOpen source — free to use
Paid from
$0
Model
Flat rate
Enterprise plan
No

Pricing not independently confirmed — check the vendor’s page.

Performance benchmarks

How Fast Is It?

Set up FastChat

Setup steps, common gotchas and what to check after 30 days.

Open the setup guide →