Apertus 1.5 Open-Source Release: Multimodal and Thinking Modes
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On October 15, 2026, Project Apertus released the Apertus 1.5 open-source models via a Hugging Face blog post. The release covers 8B and 70B variants, both of which add image and audio understanding capabilities through continued pre-training on top of Apertus 1.0, along with an optional thinking mode. The context window has also been expanded to 262,144 tokens, 4 times that of Apertus 1.0. This is currently the only report on the event, and no further developments have been disclosed.
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- Hugging Face BlogSelectedApertus 1.5 Release Notes
Project Apertus has released Apertus 1.5, adding image and audio understanding and an optional thinking mode to its 8B and 70B models via continued pretraining, and extending the context window to 262,144 tokens — 4x that of Apertus 1.0.
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Current heat3·Comparable peak9（10/15 22:00）·Comparable change over 24 hours -50%
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