Apertus 1.5 open-source models released
What happened
Apertus 1.5 extends Apertus 1.0 at 8B and 70B scales, adding image and audio understanding, an optional thinking mode, a 4x longer context window (262,144 tokens), and improved instruction following and tool calling. The weights were released on 24 July 2026 under the Apache 2.0 licence on Hugging Face.
Written by AI from the reports · updated 18 h ago
Timeline
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- Hugging Face BlogSelectedApertus 1.5 Release Notes
Our latest release, Apertus 1.5, extends the 8B and 70B Apertus 1.0 models with image/audio understanding, an optional thinking mode, a four times longer context window, improved instruction-following, and better tool use. The updated 8B and 70B model weights were released to Hugging Face on July 24, 2026 under an Apache 2.0 license.
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