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Artificial intelligence (AI) is approaching the horizon of what can be learned from human-generated data just as multimessenger astronomy (MMA) enters a data-surge era in which conventional approaches are becoming a bottleneck in discovery. The convergence between MMA and AI is poised to transform both domains. Over the coming decade, MMA will turn rare cosmic events into continuous, multi-petabyte data streams that collectively sample physics across all four fundamental interactions. Unlike typical AI datasets, this deluge is governed by known physical laws and offers a unique hierarchy of simulability. MMA therefore provides a controlled environment where AI systems must distinguish instrumental noise, simulation approximation and genuine physical novelty. Drawing on discussions from the 2025 workshop `Multimessenger Astronomy in the Era of Foundational AI' at Vanderbilt University, we argue that MMA can serve as both a proving ground for trustworthy, physics-informed AI and a scientific domain where AI itself will become indispensable for future discoveries. We outline the transformative science that this convergence can unlock and a roadmap for collaboration across astronomy, AI, industry and national research infrastructure.

SDSS J1548+2208 is a unique partially-obscured nuclear transient that exhibits multiwavelength outbursts in mid-infrared, X-ray and radio. We present the results from multiwavelength photometric and spectroscopic follow-up observations with a time span of ~2500 days since its discovery. We find that the mid-infrared and X-ray emission (with a hard X-ray spectrum) are still in a high flux level relative to the pre-flare state, suggesting a sudden increased, and possibly long-sustained accreting activity from central black hole. This is supported by the slowly-evolving high-ionization coronal lines. The mid-infrared color turns blue slowly in the rising phase, which is distinct from stellar tidal disruption events (TDEs). All these properties point to the origin of outbursts from an extreme changing-look AGN and the scenario with a normal TDE seems disfavored. The radio spectral energy distribution (SED) in ~0.65-15 GHz is unusual, displaying a double-peak feature with distinct variability characteristics. In addition, we find evidence for the late-time radio rebrightening more than six years since the initial outburst, as well as a possibly new X-ray flare, though the significance for the latter is not high. The peculiar radio flux and SED evolution could be explained by a nascent outflow expanding into and shocking circumnuclear diffuse medium filled by denser clouds. In this case, SDSS J1548+2208 represents a rare changing-look AGN which can launch radio outflows. Continued multiwavelength observations are required to map the dust and gas distribution on pc-scales, providing new insights into the environmental properties that could regulate AGN changing-look phenomenon.