In recent years, AI has made significant strides in achieving success across various domains, demonstrating capabilities that often surpass human performance in specific tasks. However, the real world presents challenges that go beyond single tasks, objectives, or predefined, static environments. We propose to consider open-world environments as the new habitat for AI agents: highly diverse and dynamic, fully interactive, teaming up with infinite and creative tasks, and requiring continuing learning and growth. Therefore, open-world agents, are expected to possess remarkable problem-solving capabilities across all cognitive functions, notably, reasoning and decision-making compared to specialized AI agents.

This workshop aims to bring together researchers from various fields to discuss emerging topics about reasoning and decision-making in open-world environments. This topic can be overly broad, but we are particularly interested in synergizing reasoning and decision-making, i.e., open-world agents that can simultaneously perform reasoning (e.g., QA, dialogue) and decision-making (e.g., planning and control), and how such unification helps tackle the challenges brought by the open world to both parties. To this end, the related fields are not limited to interleaved reasoning with decision-making, reasoning in embodied learning agents, LLM tool usage, reinforcement learning in open-world environments, open vocabulary learning, continued learning, multi-agent learning, and emerging ethical considerations in open-world environments. Our objective is to foster collaboration and insights into addressing the scientific questions about developing open-world reasoning and decision-making agents.