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Teaching AI models to say 'I'm not sure' in cases of calibration errors

Confidence is persuasive. In artificial intelligence systems, it is often misleading. Today's most capable reasoning models ...

Nvidia's Nemotron-Cascade 2 wins math and coding gold medals with 3B active parameters — and its post-training recipe is now open-source

Nvidia's Nemotron-Cascade 2 is a 30B MoE model that activates only 3B parameters at inference time, yet achieved gold medal-level performance at the 2025 IMO, IOI, and ICPC World Finals. Nvidia has ...