Arena.ai Adds Nemotron 3 Ultra to Agent Mode for Real-World Agent Evaluation

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Arena.ai has integrated NVIDIA's Nemotron 3 Ultra model into its Agent Mode, enabling users to run the model for complex, multi-step tasks. These sessions contribute to the new Agent Arena leaderboard, which evaluates agentic AI models on real-world performance using tools like web search and terminal. This expands the range of frontier models available for practical agentic workflows and provides new data for understanding their capabilities in autonomous tasks.

Arena.ai has integrated NVIDIA's Nemotron 3 Ultra model into its Agent Mode. Users can now deploy this model for complex, multi-step tasks requiring autonomous planning and tool use. User sessions contribute to the new Agent Arena leaderboard, which evaluates agentic performance (AI systems that autonomously plan, reason, use tools, and take multi-step actions).
Evaluation Signals
Task success, steerability, error recovery, user praise vs. complaint, tool hallucination
Initial Top-Ranked Model
OpenAI GPT-5.5 (High)
Tasks Analyzed (Leaderboard)
300K+
Tool Calls Logged (Leaderboard)
2M+
Lines of Code by Agents (Leaderboard)
40M

The Agent Arena leaderboard assesses models on real-world work, using tools like web search, filesystem, and terminal. It measures performance across five signals: task success, steerability, error recovery, user praise vs. complaint, and tool hallucination. This provides a practical assessment of how frontier models, including Nemotron 3 Ultra, handle complex workflows.

Users can access Nemotron 3 Ultra and other frontier models via Arena.ai's Agent Mode for tasks like writing code, creating slide decks, and analyzing documents. This platform allows experiencing and contributing to agentic AI evaluation. The initial Agent Arena leaderboard features models such as OpenAI's GPT-5.5 (High).

NVIDIA Nemotron 3 Ultra model integration into Arena's Agent Mode for enhanced community-driven AI model evaluation.
View the full update on arena.ai
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Nemotron 3 Ultra has been added to the new Agent Mode! This latest model from @NVIDIA and other top frontier models are ready for your complex, multi-step tasks. Your sessions will help shape the new Agent Arena leaderboard. https://t.co/532FH1qqm6

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