Arena (formerly Chatbot Arena)
7.1#6 in llm evaluation toolsFree planFree planWebAPISelf-hosted
VisitArena (formerly Chatbot Arena) vs Braintrust
Braintrust
7.7#3 in llm evaluation toolsFrom $249 a monthFree planWebAPISelf-hosted
VisitWhat both publish
| Fact | Arena (formerly Chatbot Arena) | Braintrust |
|---|---|---|
| Founded | 2023 | LinkedIn lists Braintrust's founding year as 2023. |
| Product | Arena is an AI evaluation platform where users compare model responses and vote to shape public leaderboards. | Braintrust describes itself as an active observability platform for AI agents that helps teams inspect production behavior and improve agent quality. |
Arena (formerly Chatbot Arena) plans
- Public ArenaFree
- AI evaluationsPriced on request
Braintrust plans
- StarterFree
- Pro$249 a month
- EnterprisePriced on request
Pick Arena (formerly Chatbot Arena) if…
Arena suits people who want to compare model responses or browse public rankings across different task types. It also offers commercial evaluation services for enterprises, model labs, and developers.
Pick Braintrust if…
Braintrust is for teams running AI agents in production, from early-stage projects to enterprise operations. It suits teams that need to examine traces, evaluate outputs, and refine prompts or models.