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What is RouteLLM?

Developed by LM-SYS, RouteLLM is an accessible toolkit that allows users to allocate tasks across multiple large language models, thereby improving both resource management and operational efficiency. The system incorporates strategy-based routing that aids developers in maximizing speed, accuracy, and cost-effectiveness by automatically selecting the optimal model tailored to each unique input. This cutting-edge method not only simplifies workflows but also significantly boosts the performance of applications utilizing language models. In addition, it empowers users to make more informed decisions regarding model deployment, ultimately leading to superior results in various applications.

What is FastRouter?

FastRouter functions as a versatile API gateway, enabling AI applications to connect with a diverse array of large language, image, and audio models, including notable versions like GPT-5, Claude 4 Opus, Gemini 2.5 Pro, and Grok 4, all through a user-friendly OpenAI-compatible endpoint. Its intelligent automatic routing system evaluates critical factors such as cost, latency, and output quality to select the most suitable model for each request, thereby ensuring top-tier performance. Moreover, FastRouter is engineered to support substantial workloads without enforcing query per second limits, which enhances high availability through instantaneous failover capabilities among various model providers. The platform also integrates comprehensive cost management and governance features, enabling users to set budgets, implement rate limits, and assign model permissions for every API key or project. In addition, it offers real-time analytics that provide valuable insights into token usage, request frequency, and expenditure trends. Furthermore, the integration of FastRouter is exceptionally simple; users need only to swap their OpenAI base URL with FastRouter’s endpoint while customizing their settings within the intuitive dashboard, allowing the routing, optimization, and failover functionalities to function effortlessly in the background. This combination of user-friendly design and powerful capabilities makes FastRouter an essential resource for developers aiming to enhance the efficiency of their AI-driven applications, ultimately positioning it as a key player in the evolving landscape of AI technology.

Media

Media

Integrations Supported

OpenAI
Claude
GPT-4
GitHub

Integrations Supported

OpenAI
GPT-5
GPT-5.1
GPT-5.1 Pro
GPT-5.2
GPT-5.3 Instant
GPT-5.4
GPT-5.6 Luna
GPT-5.6 Sol
GPT-5.6 Sol Ultrafast
GPT-6 Luna
Gemini 3 Deep Think
Gemini 3 Pro
Gemini 3.1 Flash-Lite
Gemini 3.1 Pro
Grok 4.1
Grok 4.1 Fast

API Availability

Has API

API Availability

Has API

Pricing Information

Pricing not provided
Free Version

Pricing Information

Pricing not provided
Free Trial Offered?

Supported Platforms

SaaS

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub
Online Training

Company Facts

Organization Name

LMSYS

Company Website

github.com/lm-sys/RouteLLM

Company Facts

Organization Name

FastRouter

Date Founded

2025

Company Location

United States

Company Website

fastrouter.ai/

Categories and Features

AI Gateways

Not specified

LLM Routers

Not specified

Categories and Features

AI Gateways

Not specified

API Gateways

Not specified

LLM Routers

Not specified

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