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Abstract We present the second release of theGR-Athena++waveform catalog, comprising four new quasi-circular, non-precessing, spinning binary black hole simulations. These simulations are performed at high resolutions and represent a step toward generating high-fidelity gravitational waveforms that can eventually meet the accuracy requirements of upcoming next-generation detectors, including LISA, cosmic explorer, and Einstein Telescope. Gravitational waves are extracted at future null infinity ( $I^{+}$ ) using both Cauchy characteristic extraction and finite-radius extraction. For each simulation, we provide strain data across multiple resolutions and analyze waveform accuracy via convergence studies and self-mismatch analyses. The absolute phase and relative amplitude differences reach their largest values near the merger, while the smallest errors are of order $O\left({10}^{-2}\right)$ and $O\left({10}^{-3}\right)$ , respectively. A self-mismatch analysis of the dominant (2, 2) mode yields mismatches between $O\left({10}^{-5}\right)$ and $O\left({10}^{-7}\right)$ for a total binary mass of ${10}^6{M}_{\odot }$ over the frequency range $f\in [0.002,0.1]\mathrm{Hz}$ using LISA’s noise curve. All waveforms are publicly available viaScholarSphere.