Apertus 1.5 Release Notes

Apertus 1.5 models, including 8B and 70B versions, now support multimodal input with images and audio, feature a thinking mode for improved reasoning, a quadrupled context window, enhanced instruction-following, and better tool integration. The updated models were released under Apache 2.0 on July 24, 2026, with full openness on weights, data, and training details.