ChatArena logo

ChatArena

An open-source library of multi-agent language game environments for studying how LLMs communicate and cooperate.

PricingFree
Free planYes
UrduLimited / no

Best for: AI researchers studying multi-agent LLM behaviour

Visit ChatArena

ChatArena is an open-source project from the Farama Foundation that provides game environments where several language model agents interact. It is meant for exploring and improving how AI agents talk to one another and work together.

Researchers can set up scenarios, run agents against each other and observe their communication and collaboration. The code is hosted publicly on GitHub and is free to use, making it a useful base for experiments in multi-agent AI.

Key features

  • Multi-agent language games
  • Environments for LLM agents
  • Open-source on GitHub
  • Research-focused design

Prices and features change often; check the official website for the latest plans. Last updated September 24, 2026.

Alternatives

Langroid
Free · free plan
UFO
Free · free plan
aiXplain
Freemium · free plan
Nelima
Free · free plan