Benchmark-leading scientific reasoning meets long-horizon agent capabilities. Intern-S2-397B is now available in BF16 and FP8.📜 Apache 2.0. 🤖 🏆 Scores 87.0 on FrontierScience-Olympiad and 84.0 on SWE-bench Multilingual, leading the reported comparison on both. Several specialized scientific benchmarks also see top results. 🔬 Raw scientific pages become training material directly, preserving text, visuals, symbols, and their relationships without intermediate parsing. 🧪 Joint training across 20+ scientific domains covers scientific reasoning, biomolecular interaction design, material generation, and time-series forecasting. 🛠 Long-horizon agent RL strengthens tool use and sustained execution, with thinking and non-thinking modes available.