Muse Spark 1.3 Enters Arena Leaderboard

Arena.ai posted that Muse Spark 1.3 by AI at Meta is now in the Arena. The company invited users to submit tough prompts and begin voting, with scores due soon. The post also notes that Agent Arena evaluates models on millions of real-world long-horizon agentic tasks. Models there can use web search, filesystem, and terminal tools to handle complex workflows.