Arena (formerly LMArena) vs Microsoft Copilot comparison

Arena (formerly LMArena) and Microsoft Copilot compared side by side in AI.

CurrencyUSDKRWEUR

Arena (formerly LMArena)

A crowdsourced evaluation leaderboard where users compare two AI answers blind and vote to rank models

What is good

  • Cited like an industry standard based on millions of human votes
  • Compare and try the latest models for free
  • 5 million+ monthly users (reported 2026-01)

What could be better

  • Controversy over voter preference bias (tone, length)
  • Neutrality questioned because major labs are also customers

Arena (formerly LMArena) official site

Microsoft Copilot

Microsoft's AI assistant built into Windows, Edge and Office

What is good

  • Works directly with Windows, Word and Excel
  • Latest-level models available for free

What could be better

  • Office integration features need a Microsoft 365 subscription
  • Weak personality as a standalone chatbot

Microsoft Copilot official site

At a glance

Highlighted rows are where they differ.

ItemArena (formerly LMArena)Visit siteMicrosoft CopilotVisit site
Starting priceFreeNot applicable$9.99+Official USD price
Free tierFreeFree plan available
Korean supportAverageGood
Main modelsLeaderboards: text, vision, documents, search, WebDev, image/image editing, video generation/editing, agents (Agent Arena), Alignment Index. Many major commercial and open models (total number of models needs checking)
  • OpenAI GPT-5 family (Smart/Think Deeper)
  • GPT-5.5/Claude selectable for business
  • MAI in-house models (image/voice)
Pricing typeFree, Quote/Enterprise Contract-
TypeAI appsAI services
CategoryAI Directory/ComparisonChatbot/Assistant, Writing/Productivity
CompanyArena (formerly LMArena), United StatesMicrosoft, United States
Plans
  • Users: free (voting, chat). Revenue: paid evaluation services for AI labs and companies (launched 2025-09, reported to pass $30,000,000 in annualized spending in 2025-12). Price not disclosed
  • Free
  • M365 Personal $9.99
  • Family $12.99
  • Premium $19.99
  • Pro $99.99
  • For business: Copilot Business $21 (annual), Enterprise $30 (annual)
Pros
  • Cited like an industry standard based on millions of human votes
  • Compare and try the latest models for free
  • 5 million+ monthly users (reported 2026-01)
  • Works directly with Windows, Word and Excel
  • Latest-level models available for free
Cons
  • Controversy over voter preference bias (tone, length)
  • Neutrality questioned because major labs are also customers
  • Not a comparison of apps or services
  • Office integration features need a Microsoft 365 subscription
  • Weak personality as a standalone chatbot

Prices and benefits may change. Check the official site before you pay.

Prices converted at 1 USD = ₩1,327.84 (2026-10-20). Original price shown in brackets. Taxes as listed by each provider.

Related comparisons

Add other services to compare