We present an infrared spectroscopy study of the layered topological semimetal ${\mathrm{TaNiTe}}_5$, a material with a quasi-one-dimensional structure and strong in-plane anisotropy. Despite its structural features, infrared reflectivity and electronic transport measurements along the $a$ and $c$ crystallographic axes show metallic behavior without evidence of reduced dimensionality. Optical conductivity reveals an anisotropic but conventional metallic response with low scattering rates and a single sharp infrared-active phonon mode at $396{\mathrm{cm}}^{-1}\left(49\mathrm{meV}\right)$. Ab initio calculations closely match the experimental optical data and confirm a three-dimensional electronic structure. Our results demonstrate that ${\mathrm{TaNiTe}}_5$ behaves as a three-dimensional anisotropic semimetal in its electronic and optical properties.

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• Optical conductivity
• Semimetals
• Topological materials
• Ab initio calculations
• Density functional theory
• Infrared spectroscopy